ST. MARY and MILK Rlvers

Report to THE INTERNATIONAL JOINT COMMISSION

THE DIVISION AND USE MADE OF THE WATERS OF ST. MARY AND MILK RlVERS

C. G. PAULSEN representing the United States

and

NORMAN MARR representing Canada

1951 OONTENTS :Page Letter of Transmittal -to the . Commission

Introduction ••••······ ·················••••••••••••••• 1 Water Supply- St. Mary River- Milk River ••••••••••• 2 Eastern Tributaries of 1tilk River ••••• 3 Division of Water- St. Mary River ••••••••••••••••••• 3 Milk River •••.•...•..•.•...••...• 6 Eastern Tributaries of Milk River 7 Minor Diversions •••••••••••••• , •• 7 Description of Tables •••••••••••.•••••••••••••••••••• 8 Appendix • .• . . ... • . • . • ...... • . . .. . • . • ...... • 10

TABLES Table Number Natural Flow of St. Mary River and its use by Canada and the United States ••••e•••• .l Division of St. Mary River- Canada- United States •• 2 Determination of Natural Flow of Frenchman River at the International Boundary •••••• 3 Diversions from the Eastern Tributaries of Milk River in Canada •• ~., ••••• 4 Mea.sured Diversion from Eastern Tributaries of Milk River in United States ••••••••••• 5 Monthly and Annual measured discharge in Acre .... feet of Eastern Tributaries· of Milk River at International Boundary •••••• n ••••••••• 6

List of gauging stations with map showing their locations in the river basins. Tho Honourable, The International Joint Commission,

Washington, D~C., and Ottawa, canada.

Gentlemen:- In compliance with the Provisions of Clause VIII (c) of your Order of the 4th October, 1921,

directing the division of the water~ of St. Mary and Milk Rivers between the United States and Canada, we are transmitting herewith a report on the operations during the irrigation season ended October 31, 1951.

Respectfully submitted,

Q.... G. Paulsen, Accredited Qfficer of the United States.

Norman Marr, Accredited Officer of Her Majesty

April 2, 1952~ Introduction ),

The field work incidental to the division and administration of the waters of the St. Mary and Milk Rivers in JUberta, Saskatchewan, and Montana was conducted during t he irrigation season of 1951 by the same group of engineers as in previous years. The Chief Hydraulic Engineer, United States Geolo gical Survey, Mr. c • . G. Paulsen, as accredited officer of the United States was represented in the field by Mr. c. s. Heidel, Staff Engineer, Helena, Montana. Mr. Norman Marr, Chief, Water Resources Division, as accredited officer of His Majesty, was

represented by Mr • . 0. H. Hoover, District Engineer, Calgary, Alberta. The water of the two rivers was divided between the two countries in accordance with the Order of the Commission dated in Ottawa, Canada, on the 4th day of October, 1921. The hydrometric data on which this report is based we re collected and compiled jointly for 38 international gauging stations by engineers of the United States Geological Survey under the supervision of Mr. Heidel and engineers of the Canadian

Water Resources- Division under the direction of Mr. Hoover~ The data for 6 other stations were collected co-operatively. Additional records were also collected and compiled independent ly on some 19 other stations. This report was compile d jointly by Messrs. c.s. Heidel 2. and 0. H. Hoover. vvate r Supply

St • Jl&~ ry Rive r The thirtieth annual international survey of snow conditions on the headwaters of Swiftcurrent Creek, a moun tain~us area considered typical of the headwaters of the st. Mary River, showed the snow cover of 78.8 inches was 129 per cent of the mean for the previous twenty-nine years, while the water content, 37.4 inches, of this snow cover was 137 percent of the previous mean. The run-off during May, June and July as measured at the Sf;iftcurrent Creek at Many Glacier gauging station was 77,960 acre~feet or 117 percent of 66,410 acre~feet, the average of the previous 28 years. Tl! e natural flow of the st. Mary River at the Inter.... national Boundary during the irrigation season of 1951, from April 1 to October 31, was 885,290 acre-feet or 154 percent of the average for the previous 48 years of record. Milk River TI.e natural flow of the Milk River at Eastern Crossing during the open water period of 195;1, March l to October 31, is estimated at 280,460 acre-feet or about 268 percent of 104,675 acre-feet the average flow for the previous 39 years. The tot al measured diversion for irrigation from Milk River in Montana during 1951 was 257,030 acre feet. Eastern Tributaries of Milk River The tctal measured quantity of water delivered to the United States by the Eastern Tributaries of Milk River during the open water period March l to October 31 was 186,560 acre feet as shown in Table 6, which is 160 percent of 116,905 acre feet, the average flow delivered during the previous 24 years. The natural flow from the prairies, as indicated by the Eastern Tributaries of Milk River was about 236,630 acre-feet or 182 percent of 129,?15 acre-feet the average for the past 24 years.

Division of Water st • Mary Rive r The field engineers kept themselves closely informed as to the natural flow of the St. Mary River, the water stored or

released from storage, and the quantity diverted by each country~ Any discrepancy in the division was adjusted to allow each

country its proper share as set forth i~ the Order of the Inter national Joint Commission dated Ootober 4, 1921. Statements were prepared and forwarded to the engineer in charge of the st. Mary River storage unit, the United States Bureau of Reclamation, Babb, Montana; to the Manager, Milk River Project, u.s. Bureau of Reclamation, Malta, MOntana; to the Assistant

Manager, St. Mary River Devel~pment, Lethbridge, Alberta; and to the Chief of the Water Resources Division, Ottawa, Ontario. 4.

The TJnited States St. Mary Canal was in operation from June 14 to September 15 and water was delivered tv the North Branch of Milk River from June 15 to September 15. As seepage from the canal between the Intake and the Crossing of the St. Mary River is assumed to return to the rive :;; and eventually become available to Canada, the discharge of 84,110 acre-feet passing in the canal at the St. Mary Crossing during the period June 14 to September 15 is considered as the quantity diverted from the St. Mary River by the United States. During the period of operation of the canal, 83,410 acre-feet of the diversion from the St. Mary River was delivered to the North Branch of Milk River at Hudson Bay Divide and was made available for irrigation in Montana. The slight decrease in flow between the St. Mary Crossing and the Hudson Bay Divide, which is near the end of the canal, was probably due to the excess of evaporation and seepage over the local run-off enter- ing the canal between the two points. On October 31, 1950, 11,8?6 acre--feet of water remained in storage in Sherburne Reservoir. By March 31, 1951, 30,806 acre-feet were in storage. This was increased to 59,893 acre feet by July 19. After July 19 water was released in varying amounts until the end of the season and by October 31, the storage had decreased to 6,8?5 acre-feet. The Canadian St~ Mary River Development canals diverted ?4,360 acre-feet of water from 5.

the St • Ma ry River in 1 9 51. Any question as to the proper share of the St. Mary River being delivered to either country was decided in the following manner: Daily records were obtained at the following gauging stations: l. Swiftcurrent Creek at Many Glacier. 2. Sherburne Lake reservoir - water levels. 3. Swiftcurrent Creek below Sherburne Reservoir. 4. U.S. St. Mary Canal at St. Mary Crossing .• 5.. St.Mary River at International Boundary. The daily unrecorded inflow into Sherburne Lake Reser voir was determined by a comparison of the inflow and outflow at the Swiftcurrent Creek gauging stations in conjunction with the Sherburne Reservoir storage or release quantities after being corrected for evaporation. Gauging station No.4 above shows the quantity of water diverted from the St. Mary River basin by the United States, and station No.5 shows the quantity delivered to Canada. When water was being stored in Sherburne Lake Reservoir the natural flow of the St. Mary River at International Boundary was obtained by adding to the water delivered to Canada the sum of the waters diverted by the U.s.st. Mary Canal at the St. Mary Crossing and that stored in the Sherburne Lake Reservoir. A two-day lag was allowed for stored water to reach the Boundary. 6 r,;

When water was being r eleased, the quanti ties released were deducted from the combined flow of the UcS.St. Mary Canal at St . Ma :::--y Crossing and tha t in the river near t he International Bounuar y to determine the natural flow. Computed evaporation from Sherburne Lake Reservoir was charged against the Un i ted States., The natural flow having been determined, the share to which each country was entitled by the Order of the Internation al Joint Commission was calculated on the following basis:- (1) When the natural flow of the St. Mary River was 666 cubic feet per second or less, Canada was entitled to three fourths of that flow and the United States one-fourth. (2) When the natural flow of the st. Mary River was greater than 666 cubic feet per second, Canada was entitled to 500 cubic feet per second plus one-half of t he increase over 666 cubic feet per second and the United states was entitled to the remainder. Milk Ri ver There were only a f ew small unmeasured diversi ons of water from t he North anQ South Branches of Milk River in Montana and only a small quantity diverted from Milk River in Canada. Therefore, t he natural flow of Milk River, at Eastern Crossing , is considered as haYing been delivered to the United States. Accordingly, no actual division was made of the waters of Milk 7.,

River at the Eastern Crossing of the International Boundary.

Eastern Tributaries of Milk River Frenchman River T:i.e only actual division of the waters of the Eastern Tributaries made in 1951 was carried out on the Frenchman Rivero

The details of this division are shown in Table 3 of this repor~ The natural flow of the Frenchman River at the Inter national Boundary was 115,911 acre-feet. Each country was entitled to fifty percent of the natural flow or 57,955 acre feet. Canada used 26 9 022 acre-feet and 89,889 acre-feet were delivered to the United States. Lodge Creek Canada diverted 11,505 acre-feet in the Lodge Creek basin during 1951 while delivering a total of 39p530 acre-feet to the United States. The total Canadian diversion of 11,505 acre-feet ~bove, includes 9,980 acre-feet the discharge of Middle Creek near the Alberta Boundary above Middle Creek Reservoir .. Battle Creek Canada diverted 12,544 acre-feet from Battle Creek during the open water season of 1951; and a total of 16,570 acre-feet was delivered to the United States. Minor Diversions There are a number of small dj_versions from the Eastern s.

Tributaries of Milk River in Saskatchewan for which only estimates of the quantities diverted are available , These estimates are obtained by the Water Rights Division of the Province of Saskatchewan from the individual irrigators as the quantities diverted do not justify the expense of carrying out 1 a regular survey of these small sehemes. These estimates, being incomplete and of doubtful value, are not used for division purposes in Table 3. The total quantities are, however, shown in Table 4 of this report.

Description of Tables Tables 1 to 6 are compiled to show the total quantities of water available to Canada and the United States in the St.

Mary and Milk river basins~ The tables show the share of this water belonging to each country under the 1921 Order of the International Joint Commission, the quantities made available to each country in the division, and the disposition made by each country. Table 1 deals with the natural flow of the st. Mary River at the Boundary and its division and use by Canada and the United States. It comprises seven pages, one for each month of the irrigation season. The table shows the computed natural daily flow and each country's share thereof. It further shows the recorded flow at the Boundary and the quan tity diverted by each country. ~able 2, page 1 (upper table), shows monthly increments

f~om Rolph, Lee and Pothoie creeks in Canada, to the measured flow of the St. Mary River near the International Boundary

for the irrigation season~ Table 2, page l (lower table), shows the disposition made by Canada, monthly, of its share of the natural flow of the st. Mary River. Diverted and unused quantities are also shown., Table 2, page 2 (upper table), shows the water avail able for di version to the United States and the amount divert ado The unused portion of the United States share is also listed o Another column shows the measured flow at Eastern Crossing which includes the natural flow of Milk River plus the water diverted from the st. Mary River, This measured flow is the total available for irrigation in the United States from

the two r i vers ~ Table 3 is a compile t ion, in ten-day periods, of the natural flow of the Frenchman River at the International Boun dary. This table consists of three pages. Page l shows the quantity used by Canada in Cypress Lake Reservoir and at East End; Page 2 shows the quantity used by Canada at Val Marie; and Page 3 shows the total quantity used by Canada, the natural flow of Frenchman River at the Boundary, the United States share, and the quantity delivered to the United States. Table 4 summarizes the available information on the 10.

diversions from the Eastern Tributaries of Milk River in Canadao Table 5 gives the measured diversions from the Eastern Tributaries of Milk River in the United States. Smaller

dive~sions have not been measured. Table 6 shows the monthly discharge at the Interne- . tional Botindary of the Eastern Tributaries of Milk River for the season March to October.

Appendix An appendix to this report, submitted under separate o.over, gives the results of current meter measurements, daily gauge heights and discharge at 52 gauging stations operated in the two drainage basins during 1951 •

• NATUL'\1 FLOW OF ST. MARY RIVER AND ITS US I~ BY CA11ADA Aim UNITED STATES (Units in Cu. ft. per sec.) Table 1 . ~rfl --!computed Nat. canada s Recorded canada rec d D1verted u. s. u.s.B.R. 1 Diverted Net u.s. used 1951 I Flow St. Ma ry share of Flow of more ( +) ; by Can- share Sherburne Res. , by U.s. used by more(+); !! River at Int. St. Mary st. Mary less(-~; ad ian. St. of st. ( 2-day lag St. Mary United lese( - ) Bdry. River R. near than share Mary Mary applied) Canal States than share. l Int. Bdy. + - Canal. River. stored Rlsd·. + -~----~------~------+~~~-+-----~~---4------~----~--- - - 1 ____+- __1 ~4~~----~~-1~~---r~~-----r-~•·~n-r----~------~~1~.~1~6 ~--~4~~4~ -~-----r--~0----+--4~4--~----+-~-~72 __ 2 , 4 36 "327 397 + 70 ---4+-~l~-O:..L-.9 --+ ___.J.L_39_-!----+----=:0 ___ +-~ 3U!..-9_+-----!---~.·7..;;...<0 _

3 I 54o · 4o5 '501 ._qE; I 11'5 19_ Q '39 -96

4 l I 590 442 _551 + 109 14a 39_ 0 I ~q -109_

6 I 708 521 665 +144 I 187 41 0 4"3 -144 I 7 t_. 772._ 553 I 729_ +176 219 41 o 41 -176 a I · 63l 471 'iB2 +109_ ~58 ~9_ o 49 ..... -109

1 0 , I 577 • 433 l 438 + 5 144 139 o 139 - 5 I I 11 ~q, 4IJR I 440 __a , uq , J:\7 o Hi7 + R ------~--~------r-~=----+--~~-+----~~~~------~~~-4--~~~------r-~~--+-~~--~~~------12 l 656 . 492 487 - '5 164 16Q 0 169 + 5 . 14 I 68~ 'i08 I ~8 + 20 1~ 1~~ 0 1'i'i - 20 15 I 678 I 506 523 +17 L 172 155 0 155 -17

1 6 I 74o 5 37 I 585 + 48 20 3 15'5 : 0 155 . - 48 1 _1~7 ____Jr --~a~~7----~---~== ----+--6~~~~!5---+-·~-~~ -+----~:------4~2=6~7 -4--~1~7•2~-4-----4---o~--~~1~.7=;2 __-+----~- -~9~5-- l B

1 9 8~2 _5.9.3 l 6BJ + qo : I 259 169' •• 0 169 - Q0 ~----~--~~----r-~~---+--~~-4-L~--~--~------tr-=~--+--=~--- +-----~--~---+-=~--~----~~---- _2_0 ____~-- ~8~~----+---'i~811~--L-~6~~~-~~·-·~~-+----~~ ------4' ~2~~:4~~·1__ ~~1~~7~9--~---~--~o~--~~1~.7~9--~--~--~ffi~-- 21 ' l 817 575 J 63~ + 58 : 242 181i I 0 l8J! I - 'i8 4 _:4~~---4~--~~~----~~--~:~8~~---+i~:~=~~~:~~~)6~-----~~·-----~- -~~~~·~~~~---~: --4-----+-~~----+-~~'~~~~--~-·---+-~-=~66~- _2~5 ____,~· --~9~40·------~' --~6~~7--~~J~~--~~·1-~~8~--- -~ ------~-~~,3~-+~1~.7~~--~----~-0~---r~1~.7~5--~---+--~-~----- _26____ ~1----9~ 9~6 ______1__ ~6~ ~~--+j~B~2~1 ___~1~ +~·1~~~6~+---~~------~+--1~1TI~~--~1.7~~--+-----+--=o ----+-~l~~--+---~~-~1~~5~'6 ___ _2~7----r j--=10~9~9 ____~1 _ _1~16~--t--9~1~3----r~+-·1~97-+-----r------~r-~~~~1 ~--~1.8~6---~-----+--~o ---+-~1.8~6--~----+-~~-9~7--- 28 1263 1 798 ____1020 +222 I __ 1 1 --·-tt--4.....,~6,._,.)5 -+____,2"'-'4·3.. _-+------+-~o~-~-!o2w:4:....~..-~ -+-----l-~-<-;2=:~ J6Q. ___ __L66u_ .__a6 ______...u1 .1.o..;.~L4J-.I..Xqr;o'---__.. ______.______,__ .___;o=-.---'-..:..83...,'6o:.=.-. _ __,__26 6613 _6_____ +---~~----~--~~---4~2~~--4-~~-4----~ 7 2420 1371 2390 8 9 10 11 12 13

_1~4----~- -=------~~~~--~~~~~~~~-~-----+------~1 21~ -~--~~--J------4--~----~~~---~-----+-J~~-- 1 5 2214 :: 1881 -+------+~~--+---W-----4----Y----+------1--.!UOUL--

16 ~6 ~~ I 1~4 I I : : 1~5~73~~---~~-~~~-~-~-~--~~~~ 17 I lj : ~15 lJZit. ---+-~362=.0___ ~ 8~ - +- . -i~l±_4l_ _~---..--...... ~~: -~-- :~~ ~:~ ~=--- ~ -- - t-----: ------f- ~~38 ---+---~·----~ _§ ---+--'1 - --L--· - --·------+t-----29 II ·;: -i ----- 1 _2_0 ___l___ 3~I~~ ~--~~~~4~Z--~~E~ l 1513 I i1 1n3 W ~- - ---~~--~~~-~--~~~~- -21--~-- _l..... lJ9-f3 .__ __.._,.._l9UIJ>..iL_ 3410 -~ 1554 i ----. 124 1583 --~ .-Z9- ---+-- -- -+--~---+---:.'----+---!--~...!.--- 2 2__ ___, 1r---3.LJ.3Y-..o9.~--__+--~ 1=a~21~- 1589 I _~ ~-L ______.. __lQl._ 23 3f00 ~~:! :: I; ~: t J-_lB!L_ , 16 2416 I 1624 +- -~ ______, __ --++-----=---'-= 26 ----+- 1 1488 1 27

104357 1 ___Q__ -- Jn2.2.~-t----1-~~~ ~H_e_a_n __,I __~ 3~3Io~~~------~-- !~~~---4~ 0 1 .\c . -ft. 1 2ozooo l n_QQ Table 1. u.s. used more(+); less(-) than share. + - 1 2

_6__ _ : 7 I 8 9

1 5 16 17 ___ BA1'0RAL FLOW 01<' ST. ~~~.A.:qy RI'/1::R A.H_') Il_S us ··~-=~r __CrUJ:t -..D A__~_J_rJ PT'fi'~D STAT b~S j_t}_nits in Cu. ft. per se~.) Tab_~_;_:______JUl.Y Tcomputed Na . Canada'sTRecorded'! Canada rec'·~ fDi verted lj!J· s. I u.s. B. R. Diverted Net s. used 1 ru. 1951 Flow st. Mary share ':Jf 1 Flow ··, f more(+~; j bJ -:::nn- lj Rf"iare l Sherburne Res. ! by u.s. Used by I m¢.>re( + ); Day River at Int. st.Hary i st.H

_1 t='_ 4030 2~82 : 3!±J_Q_~].?~~ --t:_---+--- ... ~ - -~ 1848 1_}3 '• I 421 560 -1288

-~-- 4106 • 2420 __ l.____j_42Q__~~!.?!9_ J ____j_ __ __ ] __ 1.886 25_4 I 422 _§]_6 -1210

1 65 lt I I . I i 1816 3 8 4 I 4~ 1 >I 3 : 39 21 9 ,_ .__)_?29~ +19 l +--- _. --1-- __l __ _* 1 _ ?1 : _J .L -10 1 4 4-o;s 2186 I ;280 ~ •1o~ ! _____ !_ ___ !?} ___ ; _ 1852 li2 366 ! 758 1 -10911 1 5 43_3 2333 : _510 ~1177 :__ I 111 ·H ooo 458 365 823 •ll17

6 4-556 2445 : 394<> l +ili5_l ___,L -- .,.92 -ft--_?11l_L_ 240 376 616 ! -1495 1 7 4-467 2400 : 4020 I +1620 _ ---~- 98 -i 20.67 +--- __74 I 373 447 I -1620 8 li-29lf. . 2314 _llQO I +1586 I ~ • 97 jl 1980 I . 21 i 373 394- -1586 9 II tl 2;51 , llo8_g_ _;_ +1 E3j_·--~ 67 ~ __ 20 17 · 110 3.98 28.8 : -1129 1 0 11_38 > 2_ 36 : - llo20 I +1684 I 41 £- 2002 121 439 I 31,8 I ' -16811 11 3851 2092 336o_l:!"1268_f_ 57 _;,__ 1759 77 lull _ I 491 ! I ~1268 1 2 3381 1857 2960_ +1 OJ.J_ 17 !: 1524 I 20 4o.l _j__ 421 . . •U03 13 3002 1668 2580 + .:!'~- I 31 !: . 133'+ I 9 431 4-22 I - 912 14 3059 1696 . 2330 ~-~4 1----+-• 4.6 1; =· 1363 234 1 1J.95 729 j - 634 ( 1 5 3163 1748 I 2250 I + 5.02 60__ +.- 141~ 394 I 519 913 i -- 502 16 3274 18o4 I 2220 I + 1+16 I 83 :: 1470 l 535 I 519 1051+ I - 416 17 3306 182~---+ - ~2 10_. ~~ 3~-~----~-- 172 _j; __l48L} 577 519 102_6 f - 390 r-48 __!__ __ 1 2190 1 +~2- t----t--~ ---4- 14-62 I 550 517 1067 ;· - 395 1 19 1778 _Jl~o =-=k4:o? ~------~- ____g_~ _:_-~= 1~~ ·526 j .. . . 51.7 I 1o43 j i - 1+o2 20 1822__J__ ?)7()_ . .. 471-\_ 258 :1 1566 __ 569 I 526 1095 . - 471 1 21 1708 -+--?~- :~ ,732 i 1 ~~_lll2_ _ r- 113 . 530 64-3 I - 732 6 1 ~; ~26~ ~~ ~ : -~:~~ 1~ :_ r ~t lt ~~- ~-- ~ · ;~; 1 ;~~ ~~; · =~~; 24 2208 1271 . 1780 ~ + 509_j_ ____.._ _ ])_0_=-=-t ______79 l 507 I 4-28 ·- 509 25 2293 1313 1610 _L_±_2~7_L_ ___ ; __ ]).£__ : ~H 178 I 505 68) - 297 26 I· 226B t· 1301 I 1500 . L ~~_9_j_ ____~ ___ _)_22 __ I _ JG'[-L= --~4L - I _. 522 I 768 - 199_ 27 I ;t 2180 I ___ 125 I 139Q. - ~- ]Jl~------t--~ - _u_- __ill_ + 239.. + 551 790 - 133 28 1 2o48 ~ 1191 --.;, _ _~Jll-_9 _~--~1!9.. .~- __ ---~ ___ 5 _21 _ -~-----~1 -~ _ 147 _j ------~---.2-~!_ __ L_.J_o_~ - _ 1 - 14 .. _29 j 1988 __ _ f-___1:l:_61 __ -+ _!-2.10 _ ~ !.].~9. i _ ... __ : ___ 2_2_8_. -~- __ _!?1_ __ ~ _____ ....2.~ -- ; -· __ 563 I _§28 ~~~~2. - .3.9___ _ .!2_ey___ ~--~ _!._1)~_ -·-~ -- +J~.O--~ ~- ?99_ L -- _;_ ___ - _524__ J~. __19l! :.. ______!1_ __ ~ ------T 572 +- 569 . ·----· J__:- -~Qi ~ . __1_!!01 ____ _ .!_().§]__ _ 1330_ : _.. __ ?63 5)1 __ __5_8_Q_ 471 _ 263 ~~tal-~ ~- 1 i ____ f _ ~- 411-: 1 ~~ ~t- - -±Oi "' ec_:!t . _:_ J-09.12~.---- ~ __ 55g_2~~--;-8Q919 ___ ; •?~11§~+ _____ ~- _?~~5 --+---- -~- -- - I ~049 14765 __ 20118 -;..24-776 ' '1e'ln '_ 32)0 1-- .. ~~¢---t- 5~ - ~~- 19!3_, _____ 1 _ !,99 Jt. l45o- 476 61+9 799 Ac . -ft .j l~660Q_ I 109600 158700 __ !!_l¥214o l _____ 122 0 _ 89050 29290· 39900 49111-0 NATUR..!\.1 FI,OW 01<' ST. MARY RIVER AHD ITS USl<~ BY CAJ~ADA AHD UNITED STATES (Units in Cu. ft. per sec. ) Table 1. ·August compute d Nat. Canada a Recorded I Canada rec d Diverted u. s. u. s. B. R. Diverted Net u.s. us ed ' ' 195J Flow s t . Mary share of Flow of more(+); by Can- shar e _§perburne Res. by u. s. Used by more ( +) ; D~ River a t Int. s t. Mary st. Mary I less (-); ad ian. st. of s t. ( ~ - day lag st. Mary United lese(- ) Bdry. Rive r R. near than share Mary Ma ry applied) Canal States than share. 1 Int. Bd.v. + - Canal. Rive r . St ored Rlsd·. + 1--1----=1=-=6..;;...83.e.__--~ 1oo8 12 so +272 565 -=67-'5oiC-.-l.__-----+---=1-t-L-79-+-_~'>82=--+--4o~n~i----+----=- 2...... ,72,..___ _2_ _ -+--__1_.:::. 5_61_-+--·-__9ll 114o +19~ + __Q]JJ 61._4 161 -+--f.)..V.8!.=2---l---L4 .bloo-.21 --i-----1---=....:i"""QL..l--~- 1 3 15'56 945 1030 + 85 618 611 61 f-)87 _526 I - 85 _4_,___+--~ ---'1-..:..5-4.96..:.._____:__ ___..L.;.96:...c)'5 ~ __..,_ql6')~ -+--_:_+ _.::2~0 J 617 631 41 f1]0 l 611 I I ..;. · 2Q

5 1565 i 949 I 941 I - 8 614 616 44 580 I 624- + 8 . 6 7 8 9 1 0 I 1! 1073 703 l g8f.) +282 695 --370~-+~----~~ 4-99~ ~--~587~ ~--~~~--~~~~88 -~ 8 2 _1_1 ______, ____1;:;;;.;1;;;..,•3 ._8__ +-!, _ ____.74'3~~6___,: . _ _9_n : +191 702 ~~ 4o2 373 584 ·- I 211 -191 12 1211 f 772 899 ! +127 711 I! l:J.39 268 580 312 -127 __..13;;___+-j -:-, __1=-=0 :;...=:6...,_3 _.,._!---= 6...,_9~8 -+-i __ __:8:..J_5i___f- +1f1'i l 621 1 365 363 578 210 I • l f1S

14 ! 1120 I 727 I 84o ' +ll3 I 420 _123 . 296 576 280 ...... : --4-1--....:::.11~3 - 15 i 1081 I 707 i 7'JO + 8> 455 " 37'> I 285 576 221 i I - - 83

Table 1. u.s. used more(+); lese(-) than share. Table 2 Page 1 DIVISION OF ST. NIAHY RIV EH CANADA 1951 hfater available in acre-feet

. . .-- :3t.Mary R• :Holph Creek: Lee Creek : Pothole Combined l'1onth Boundary :at Kimball :at Cardston:Creek at flow 1951 --· Hagrath April 40,360 2,460 10,180 1750e 54,750 J.Vlay 204,300 2,880 31,190 238,370 June 186,200 5, 530 32,300 224,030 July 158,700 3,020 18,990 180,710 August 51,660 1,180 8,710 61,550 September 85,050 2,450 12,690 100,190 October 27,6!!,0 1 1 450 10,120 102,210 Total 823,910 18,970 124,180 1750e 968,810

DISPOSITION

:Canadian: : Canada's: Month :St. Mary:M.I.D. Canal M.I.D.: Total : Share :Unused 1951 Canal :Spring Coulee: Canal :Diverted:St. I~ry : by Magrath: :Magrath: R. :Canada April Nil Nil Nil Nil 33770 33770 May 4370 69 4,439 113700 109261 June 11280 129 84 11,493 112000 100507 July 11340 583 301 12,224 109600 97376 August 28390 1310 1080 30,780 44940 14160 September 4900 4,900 45890 40990 October 10270 252 10.522 22280 !!,2458 Total 70550 2091 1717 74,358 512880 438522 Ta bl e 2 Page 2 DIVISION OF ST. MARY RIVER UNITED STATES 1951 ----·------Water available in acre-feet..-...-, __ _ .• St. Mary River MilkBl Y?r .• : Sherburne Res. : : : :Ueesured Month : U. S. • : : Total :Diverted:Unused ~i' low@ Share Stored:ReleasediAvailable: :Eastern :for _Div. . : Cross1ng --April 14950 8360 0 6590 0 65'9o ·---59·oro May 93240 8180 5460 90520 0 90520 46310 June 92~50 10830 . 2520 8~840 9670 74170 56050 July 89050 12700 2080 7 430 29290 491L1 0 64300 August 24430 169 18220 42481 35750 6731 49810 September 26050 250 22750 48550 9400 39150 35790 October ,32420 10ZO 1,3230 44620 0 41650 17730 Total 372360 41559 64260 395061 84110 310951 329630 I Storage in Sherburne Lake Reservoir on March 31, = 30 5 50~ c re-fto October 31, = 6, 875 acre f~o Storage in Fresno Reservoir on March 31, .• 99,883 7-~ cre ~ .ft, October 31, = 89,434 acre-ft. The water store d in Sherburne Lake Reservoir includes t he amount lost by evaporation. DIVERSIONS FROM MILK RIVER UNITED STATES 1951 Quantities in acre-feet : Fort : : : : : :--van·-·: MoBth:Belknap:Paradise:Harlem:Harlem:Agency~Dodson:Dodson:dalia~Tc t a l : Canal : Canal : Canal: No.2 : Canal: Nor_th.:_;3o)4th..; C~ n.el.L_~ April 1590 -- . 79 ·- -~ 4? 30 -- o~ OO May 9600 815 2700 113 615 2210 16610 930 33)90 rrune 11770 5980 4520 1020 7610 4080 16360 4!:- 20 55760 July 16080 4620 3490 1390 6010 5270 19340 8030 64230 August 15200 7170 3330 678 4640 4570 18450 6740 60'780 Sept~ 4320 2120 397 2380 17850 3430 30500 October 268 5700~:____ 59 7Q Total 58560 20700 14520 3200 18880 18780 9884 0 23550 257030 Storage in Nelson Reservoir on March 31, = 15666 acre-feet on October 31; 4c316 ac:c·e-f eet

/ Table 3 Page 1 DETERMINATION OF NA TURAL FLOVJ OF FRENCHMA N RIVER AT I NTEHNATI ONA L BO UNDAHY 1951 Hat er used by Canada at Cypress Lake and East End . Quantitie. ~ in s econd-feet, Date at :Us ed at Cy2ress: Us ed at East End . Total Intern' 1: Stored.: Released: Stored :Releas-:Diverted:Return: Used Boundary: ed flow . March 1 .;. 10 o.o o.o o.o o.o 0,0 o.o o.o 11 - 20 o.o o.o 1..0 o.o o.o - 1.0 21 - 31 o.o o.• o 3.0 o.o o. o JoO A-pril .1 - 10 3.. 0 o.o 7.0 o. o o.o 10.0 11 - 20 772.0 8.0 94.9 0,0 o_o 858.9 21 - 30 1084.0 32.0 131.5 o.o o.. o 1183.5 Jl.lay 1 - 10 2757.0 65.1 324.3 o.o o.o 3016.2 11 - 20 1541.2 36.4 224 .. 3 o.o o.o 1729.1 21 - .31 220.6 s.s 28~9 o.o o.o 240.7 June 1 - ~0 117.0 9. 2 50.5 27.0 8.1 177.2 11- 20 117.5 7.8 109.3 58.4 17.5 . 259.9 21 - 31 24.0 16,2 21.3 321.6 96 .. 5 25.4. 2 July 1 - 10 33.1 15.5 10.3 104.9 31.5 101.3 ll - 20 o.o . 14.9 23,6 72.7 21.8 12.'4 21 - 31 o.o 23 .o 143.1 293.2 88.0 39.1 August 1 - 10 o.o 11.2 27lo2 397.7 119.3 - 4.0 11 - 20 1.5 6,0 87.3 26697 8o.o 94.9 21 - 31 5.4 8.3 108.7· 46. 2 13.8 138.2 Sept em her 1 - 1v 32.0 12.9 280.3 o.o o.o -261.2 11 - 20 26.7 12.5 9.5 o.o o.o 23.7 21 - 30 1.9 12,2 1 .• 1 3.9 1.2 - 8.7 October 1 - 10 7.0 13,2 67 . 3 0.1 o.o . .-.73.4 11 .., 20 16,4 12,7 o.o o.o 4.0 1.2 6.5 21 - 31 30.2 13.5 5ol 0 . ~0 o.o 21.8 Total sec-ft .• 6790.5 339.4 1128_,6 874.9 1596., 4 47$.9 7$22.3 Mean 27.7 1.4 4.6 3.6 6.5 2.0 31.9 Ac-ft, 13469 673 2239 1735 3166 949.9 15515 . Table 3 Page 2

DETEHNINATION OF NI'. TUli.!.; L FLO ~ J OF FRENCH J.VIAN RIVER AT I NTERNATIONAL BOUND AHY 1951 \later used by Canada at Val Marie Quantities in second-feet . . . Date at :Used @ U22er Val Marie :Used@ Lower Val Marie:Heturn: 'i'otal Int'l Bdy: S tor e d:Released:Divert~:Stored:Rls'd.:Diverted:Flow used ed March 1 - 10 6.0 o.o o.o o.o- o.o 6.u 11 - 20 14.0 o.o o.o o.o o.o 14.0 21 - 31 58.0 o.o o.o o.o 0,0 58.0 April 1 - 10 269.6 0,0 1732.0 o.o o.o 2001.6 11 - 20 28.3 o.o 1515 .• 0 o.o o.o 1543 .. 3 21 - 30 503.5 o.o 463.8 o.o o.o 967.3 May 1 - 10 504.9 o.o 42.4 0,0 o.o -547.3 11 .... 20 603,6 o.o 476.9 0,0 0.- 0 1080.5 21 - 31 60,4 3.8 377.4 200.0 61.1 459.7 June 1 - 10 119.8 49.6 653.2 765.6 244.6 37,2 11 - 20 18.6 69.2 42.6 393.4 138.8 385,0 21 - 30 11.3 103.6 63 '5 167.6 81.3 264.7 July 1 - 10 37.8 69.5 321,3 89.7 47.7 395.0 11 - 20 4.0 125.1 659.6 227.0 105.6 -409.1 21 - 31 95.8 192.4 1099.1 753.0 283,6 -533.1 August 1 - 10 132.9 181.3 724.7 678.6 258,0 -255.7 11 - 20 5.5 108,2 201,7 176,1 85.3 8,2 21 - 31 238.7 o.o 225.5 53.3 16.0 50.5 September 1 - 10 129.1 o.o 412.0 3.1 0,9 285.1 11 - 20 956.5 o_o 347.6 o.o o.o -608.9 21 - 30 34.9 o.o 459.7 o.o o.o -424.8 October 1 - 10 289.5 o.o 190.7 0,0 o.o 98.8 11 - 20 126.7 o.o 205.9 17.7 5.3 - 66.8 21 - 31 0.9 o.o 143.0 21.2 6.4 -127.3 Total sec-ft. 2327.4 1922.9 902,7 5752.1 4605.5 3546,3 1334,6 4665 .• 5 Mean 9.5 7.8 3.7 23.5 u~.8 14.5 5.4 19 .• 0 Ac-ft. 4616 3814 1790 11409 9135 7034 2647 9254 Table 3 Page 3 DETERJ\ITNATION OF NATURAL FLOW OF FHENCHMAN HIVER AT INTE HN.ATIONAL 13 0UND .AHY 1951

-~Qu=a=-==ntt_ti§..S in sec ond=---=f...;;.e=e~t•:...... -- _____ : : : Date at : Used by Cnnada :Total :Frenchm§~~iver_:_J[nited States Int' 1 Bdy. :Cypress L. :Val Marie :Used by:Flow @ :Natural: :Received :& East End: :canada ~ Boundary: Flow : Share : + or · .... March 1 - 10 o.o 6.0 6.0 30.0 36e 0 18.0 12.0 11 - 20 -1.0 14.0 13.,0 31.0 44.0 22.0 9.0 21 - 31 3.0 58.0 61.0 109.0 170.0 85.0 24 ,0 April ' 1 - 10 2001.6 2011 .. 6 4830.0 6841.6 3420.8 1409 , 2 11 - 20 1543.3 2402o2 8773.0 11175 .. 2 5587,6 3185,.4 21 - 30 . 967.3 2150.8 7359.0 9509 .. 8 4754.9 2604.1 May · i 1 - 10 3016.2 -547.3 2468 o9 14696.0 17164.9 8582.4 6113.6 11 - 20 1729.1 1080.5 2809.6 2115.0 4924a6 2462.3 -347.3 21 - 31 240.7 459.7 700.4 769"2 1469.6 734.8 34.4 June 1 - 10 177.2 37.2 214.4 425.4 639.8 319.9 105.5 11 - 20 259.9 385.0 644.9 453.5 1098.4 549.2 -95.7 21 - 30 254.2 264.7 518.9 472.1 991.0 495.5 -23.4 July 1 - 10 101.3 395.0 496.3 165.4 661.7 330.8 -165·.4 11 - 20 12.4 -409.1 -396.7 708.0 311.3 155.6 552.4 21 - 31 39.1 -533.1 -494.0 540.2 46.2 23.1 517.1 August 1 - 10 -4.0 -255.7 -259.7 281.2 10.8 270.4 11 - 20 94.9 -8.2 86.7 381.7 234 , 2 147. 5 21 - · 31 138.2 50.5 188.7 395.0 291.8 103.2 September 1 - 10 -261.2 285.1 23.9 563.0 586.9 293.4 269.6 11 - 20 23.7 -608.9 -585.2 959.0 373.8 186.9 772.1 21 - 30 -8.7 -424.8 -433.5 455.6 22.1 11.0 444.6 October l - 10 -73.4 98.8 25.4 211.5 236.9 118.4 93.1 11 - 2D 6.5 -66.8 -60.3 243.5 183.2 .91.6 151.9 ~1 - . 31 21.8 -127.3 -105.5 . 351.9 246.4 123.~ 228.7 T·Qta1 - sec-ft. 7822.3 4665.5 12487.8 45319.2 57807.0 28903.2+16416 Mean 31.9 19.0 51 .. 0 185 236 118 67 Ac-ft. · 15515 9254 24769 89889 ll4659 57329 +32561 Estimated Acre-feet Total of Minor Divorsions shown in Table 4 ___1_g5_12. 626 . -626 . IT5'9TI1 ~79~5 +3193~ Table 4 Di JERSIONS FROM THE EASTERN TRIBUTARIES OF IHLK HIVEH IN CANA DA Quantities in acre-feet Lodge Creek Tributary Basin Total of 6 Minor Diversions, Detailed in Appendix 105 Spangler Ditch near Govenlock 1420 Middle Creek near Alberta Boundary 99$0 Total Diverted from Lodge Creek in Canada 11505 Flow of Lodge Creek at International Boundary 39530 Battle Creek Tributary Basin s- Total of 24 Minor Diversions, Detailed in Appendix 1077 Diverted by Cypress Lake \Jest Inflow Canal 13140 Heturned by Cypress Lake West Outflow Canal 3740 9400 Richardson Ditch near Consul 6$7 NcKinnon Ditch near Consul $06 Stirling & Nash Ditch near Consul 1460 2953 Estimated Return Flow $$6 2067 Total Diverted from Battle Creek in Canada 12544 Flow of Battle Creek at International Boundary 16570 I Frenchman Hi ver Tributa.r..y_J_2?-s in Total 39 Minor Diversions, Detailed in App endix 1252 Diverted to Cypress Lake Reservoir 13469 Released f rom Cypress Lake Reservoir 673 12796 Di verter' o East End Heservoir 2239 rleleasea ~ rom East End Reservoir 1735 504 Diverted to Val Marie Reservoirs 16025 Released from Val Marie Reservoirs 12949 3076 East End Irrigation District Canal 3166 Val Marie Irriga. tion District West Canals 1790 Val Marie Main Canal 7034 11990 Estimated Return Flow 3596 Total Diverted from Frenchman River in Canada Flow of Frenchman Hiver at International Boundary Table 5 ME ASUUED DIVEHSION3 FHOill THE NORTHERN TRIBUTARIES OF rJIILK RIVER IN THE UNITED STATES 1951 (Quantities in acre-feet)

--·-- ---··-·-- .. .. - ·------Irrigator Mar. Apr. : f-tl3.y June: July: Aug.: Sept.: Oct. Total

Lodge Creek North Chinook Canal 0 2,340 2,410 957 28 8,303

B~ttle Creek Illlatheson Canal 0 10 188 45 0 0 0 0 Frenchman River Frenchman Canal 0 1,410 2,360 1,700 1,500 589 0 0 7,559

Total 0 3,760 4,958 2,702 1,839 708 2,110 28 16,105

a Partly estimat ed record. b About 230 additional acre-feet were pumped from Battle Creek below the diversion to irrigate land previously served by the Hatheson Canal • • Table 6

Monthly and Aru1ual measured di~charge in acre-feet of Easter n Tri: .u t :_,i... ies of Milk River at Internationa l Boundary, for 1951.

---- . ---.------. - ~----.- ----...... St a tion r.: a rch: April May June . July . Au g . Sept.: Oct. Total ------. Lodge Creek o.o 19770.0 10260.0 1650.0 153.0 4680.0 2800.0 220.0 39,530 McRae coulee o.o 1160.0 3.8 o.o o. -o 3.2 2.2 o.o 1,170 Woodpile Cou·l ee o.o 1200.0 286.0 2.6 6.7 0.4 2.0 o.o 1,500 Battle Creek o.o 4310.0 7660.0 1500.0 766.0 224.0 1130.0 979.0 16,570 Lyons Coulee o.o 971.0 252.0 o.o o.o o.o o.o o.o 1,220 East Br. Battle Creek o.o 1500.0 179.0 o.o o.o o.o o.o o.o 1,680 Whitewater Creek o.o 1360.0 453.0 9.5 1.8 5...2 . - 19.0 9.7 1,860 Frenchman River 337.0 41580.0 34870.0 2680.0 2800.0 2100.0 3920.0 1600.0 89,890 ' McEachern Creek o.o 10620.0 1080.0 6.9 1.6 o.o o.a o.o 11,710 Horse Creek o.o 355.0.0 404.0 6.9 o.o 1.4 20.0 o.o 3,980

Rock Creek o.o 13510.0 2430.0 503.0 177~0 210.0 343.0 274.0 17!450 186,560

Totals 337 99531.0 57877.8 6358.9 3906.1 7224.2 8237.0 3082.7 186 J 554.7 Report on Division and Use Made of the Waters of St. Mary and f.Ulk Rivers List of Gauging Stations Station Number Stream and Location St. Mary River Basin St. Mary River near International Bdy. Int. St. Mary River near Lethbridge, Alta. S·wiftcurrent Creek at Many Glacier, Mont. Int. Sherburne Lake Reservoir@ Sherburne, Mont. Int~eR. Swiftcurrent Creek at Sherburne, Mont. Int. Rolph Creek near Kimball, Alta. Lee Creek at Cardston, Alta. Pothole Creek at Russell's Ranch St. Mary Canal at St. Mary Crossing near Babb, Mont. Int. St. Mary Canal at Hudson Bay Divide near Browning, Mont. Int. St-. Mary Canal at Intake Int. Milk River Tributary Basin 11 AA5 Milk River at Nilk River, Alta. Int. 11 AAo. 2 Milk River at Eastern Crossing of International Boundary Int. 11 AA0 • North BTanch Milk River above St. Mary 3 . Canal near B::covming, Mont. Int • 11 AA1 North Branch ~lilk River near Int'l Bdy. Int. 11 AA25 South Branch Milk River near Int'l Bdy. Int. 11 AD 0 •1 Whitewater Creek near International Bdy. Int. Wildhorse Lake Basin (Closed basin not included in report) 11 AA26 Sage Creek@ "Q" Ranch nr. Wildhorse, Alta. 1 Sage Creek at International Boundary

Lodge Creek Tributar~sin 11 AB6 Lodge Creek at International Bdy. Int. 11 AB7o McRae Coulee @ International Bdy. Int. 11 AB72 C.B. Spangler Ditch near Govenlock, Sask. 2 North Chinook Canal nr. Havre, Mont. 11 AB9 Middle Creek near Alberta Boundary Battle. Creek Tributary Basin 11 AB76 Battle Creek above Cypress Lake Vest Inflow Canal near West Plains, Sask. Int. 11 AB27 Battle Creek at International Boundary Int. 11 ABo.l Woodpile Coulee near International Bdy. Int. 11 As0 • 3 East Branch Battle Creek nr. Intfl Bdy Int. 11 AB75 Lyons Coulee at International Boundary Int. 11 AB78 Cypress Lake West Inflow Canal near West Plains, Sask. Int. -2-·

Station Number Stream and Loca t ion Remarks

Battle Cr ee .lf. . Tr~buta;rx Basin Contrd. 11 AB77 Cypr ess Lake VJ est OutflovJ Canal nr. West Plains, Sask. Int • . 11 AB58 Richardson Ditch near Consul, Sask. 11 AB44 McKinnon Ditch near Consul, Sask. -~ 11 AB18 Stirling and Nash Ditch near Consul, Sask. -• 3 Matheson Canal near Chinook, Mont. Frenchman Riyer Tributary Basin 11 AC37 Cypress Lake Reservoir near Vidora, Sask. Int. R. 11 AC64 Belanger Cr eek Diversion to Cypress Lake Int. 11 AC6o Cypress Lake East Outflow Canal near Vidora, Sask. Int. 11 AC18 Frenchman River above East End Reservoir, Sa ska tchevvan Int. 11 AC55 East End Reservoir at East End, Sask. Int. R •. East End Canal at East End, Sask. Int. ii !g12 Frenchman River below East End Reservoir at East End, Sask. Int. 11 AC57 Frenchman River at Morrison's nr. East End, Sask. Int •. 11 AC23 Frenchman River at 50 Mile near Bracken, Sesk. Int. 11 AC63 Val Marie West Reservoir near Val Marie, Saskatchewan. Int. R. 11 AC65 Val Marie West Gravity Canal near Val Marie, Saskatchewan. 11 AC66 Val Marie West Pumping Canal near Val Marie, Saskatchewan. 11 AC56 Val Marie Reservoir near Val Marie, Sask. Int. R. 11 AC54 Val Marie Main Canal near Val Marie, Sask. Int. 11 AC51 Frenchman River belbw Val Marie, Sask. Int. 11 AC41 Frenchman River at !nternational Bdy. Int. 4 Frenchman Canal near Sa co, r.ront. Roc~ dreek Tributary Basin 11 AEo. 4 McEachern Creek near International Bdy. Int. 11 AEo. 3 Horse Creek ne ar International Bdy~ Int. 11 AEo. 2 Rock Creek at International Bdy~ Int. Int.--International gauging station. Int.R.-International Reservoir (stage) station •. * This station not used in division of St. Mary River water. r:-r. :hl M o

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