VOLUME 7 OF 8
MIDDLESEX COUNTY, MASSACHUSETTS (ALL JURISDICTIONS)
COMMUNITY NAME COMMUNITY NUMBER ACTON, TOWN OF 250176 ARLINGTON, TOWN OF 250177 Middlesex County ASHBY, TOWN OF 250178 ASHLAND, TOWN OF 250179 AYER, TOWN OF 250180 BEDFORD, TOWN OF 255209 COMMUNITY NAME COMMUNITY NUMBER BELMONT, TOWN OF 250182 MELROSE, CITY OF 250206 BILLERICA, TOWN OF 250183 NATICK, TOWN OF 250207 BOXBOROUGH, TOWN OF 250184 NEWTON, CITY OF 250208 BURLINGTON, TOWN OF 250185 NORTH READING, TOWN OF 250209 CAMBRIDGE, CITY OF 250186 PEPPERELL, TOWN OF 250210 CARLISLE, TOWN OF 250187 READING, TOWN OF 250211 CHELMSFORD, TOWN OF 250188 SHERBORN, TOWN OF 250212 CONCORD, TOWN OF 250189 SHIRLEY, TOWN OF 250213 DRACUT, TOWN OF 250190 SOMERVILLE, CITY OF 250214 DUNSTABLE, TOWN OF 250191 STONEHAM, TOWN OF 250215 EVERETT, CITY OF 250192 STOW, TOWN OF 250216 FRAMINGHAM, TOWN OF 250193 SUDBURY, TOWN OF 250217 GROTON, TOWN OF 250194 TEWKSBURY, TOWN OF 250218 HOLLISTON, TOWN OF 250195 TOWNSEND, TOWN OF 250219 HOPKINTON, TOWN OF 250196 TYNGSBOROUGH, TOWN OF 250220 HUDSON, TOWN OF 250197 WAKEFIELD, TOWN OF 250221 LEXINGTON, TOWN OF 250198 WALTHAM, CITY OF 250222 LINCOLN, TOWN OF 250199 WATERTOWN, TOWN OF 250223 LITTLETON, TOWN OF 250200 WAYLAND, TOWN OF 250224 LOWELL, CITY OF 250201 WESTFORD, TOWN OF 250225 MALDEN, CITY OF 250202 WESTON, TOWN OF 250226 MARLBOROUGH, CITY OF 250203 WILMINGTON, TOWN OF 250227 MAYNARD, TOWN OF 250204 WINCHESTER, TOWN OF 250228 MEDFORD, CITY OF 250205 WOBURN, CITY OF 250229
Effective: June 4, 2010 Map Revised: Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER 25017CV007B
NOTICE TO FLOOD INSURANCE STUDY USERS
Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data.
Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components.
Initial Countywide FIS Effective Date: June 4, 2010
Revised Countywide FIS Date:
TABLE OF CONTENTS – Volume 1
Page
1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 2 1.3 Coordination 12
2.0 AREA STUDIED 14 2.1 Scope of Study 14 2.2 Community Description 22 2.3 Principal Flood Problems 23 2.4 Flood Protection Measures 27
3.0 ENGINEERING METHODS 33 3.1 Hydrologic Analyses 34 3.2 Hydraulic Analyses 93 3.3 Vertical Datum 104
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 105 4.1 Floodplain Boundaries 105 4.2 Floodways 107
5.0 INSURANCE APPLICATIONS 109
6.0 FLOOD INSURANCE RATE MAP 109
7.0 OTHER STUDIES 116
8.0 LOCATION OF DATA 116
9.0 BIBLIOGRAPHY AND REFERENCES 117
i
TABLE OF CONTENTS – Volume 1 – continued
FIGURES Page
Figure 1 – Floodway Schematic 108
TABLES
Table 1 – Initial and Final CCO Meetings 13-14
Table 2 – Scope of Revision 15
Table 3 – Letters of Map Change 16
Table 4 – Flooding Sources Studied by Detailed Methods 17-18
Table 5 – Areas Studied by Detailed Methods 19-20
Table 6 – Areas Studied by Redelineation 21
Table 7 – Areas Studied by Approximate 21-22
Table 8 – Summary of Discharges 51-84
Table 9 – Summary of Stillwater Elevations 85-86
Table 10 – Manning’s “n” Values 98-103
Table 11 – Community Map History 111-115
TABLE OF CONTENTS – Volume 2
TABLES – continued
Table 12 – Floodway Data 1-140
ii
TABLE OF CONTENTS – Volume 3
EXHIBITS
Exhibit 1 - Flood Profiles Aberjona River Panels 01P – 08P Aberjona River North Spur Panels 09P – 10P Alewife Brook (Little River) Panels 11P – 13P Angelica Brook Panels 14P – 15P Assabet Branch No. 3 Panels 16P – 17P Assabet Branch No. 4 Panel 18P Assabet River Panels 19P – 38P Baddacook Brook Panels 39P – 40P Baiting Brook Panels 41P – 43P Bear Meadow Brook Panel 44P Beaver Brook 1 Panels 45P – 49P Beaver Brook 2 Panels 50P – 54P Beaver Brook 2 - Split 1 Panels 55P Beaver Brook 2 - Split 2 Panels 56P Beaver Brook 2 - Split 3 Panels 57P Beaver Brook 3 Panels 58P – 61P Beaver Brook 4 Panels 62P – 71P Beaver Brook 5 Panels 72P – 73P Beaver Dam Brook Panels 74P – 82P Bennetts Brook Panels 83P – 87P Birch Meadow Brook Panel 88P Black Brook Panel 89P Bogastow Brook - Jar Brook Panels 90P – 95P Bogle Brook 1 Panels 96P – 97P Bogle Brook 2 Panels 98P – 103P Boons Pond and Branch Panel 104P Boutwell Brook Panels 105P – 106P Bow Brook Panels 107P – 108P
TABLE OF CONTENTS – Volume 4
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Branch of Assabet River Panels 109P – 110P Branch of Elizabeth Brook 1 Panel 111P Broad Meadow Brook Panels 112P – 113P Brook A of Shawsheen River Panel 114P Brook from Waushakum Pond Panels 115P – 116P Butter Brook Panels 117P – 119P Catacoonamug Brook Panels 120P – 121P Charles River Panels 122P – 133P Cheese Cake Brook Panel 134P
iii
TABLE OF CONTENTS – Volume 4 – continued
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Cherry Brook Panels 135P – 137P Chester Brook Panels 138P – 141P Chicken Brook Panels 142P – 145P Cochituate Brook Panel 146P Cold Brook Panel 147P Cold Spring Brook Panels 148P – 151P Cole's Brook Panel 152P Collins Brook Panel 153P Conant Brook Panels 154P – 157P Concord River Panels 158P – 164P Content Brook - Middlesex Canal Panels 165P – 167P Course Brook Panel 168P Cow Pond Brook Panels 169P – 171P Cranberry Brook Panels 172P – 173P Cummings Brook Panels 174P – 175P Dakins Brook Panel 176P Danforth Brook Panels 177P – 180P Darby Brook Panels 181P – 182P Davis Brook Panels 183P – 184P Dirty Meadow Brook Panel 185P Dopping Brook Panels 186P – 187P Dudley Brook / Tributary A to Dudley Brook Panels 188P – 191P East Outlet Panels 192P – 193P Elizabeth Brook 1 Panels 194P – 197P Elizabeth Brook 2 Panels 198P – 203P Elm Brook Panels 204P – 206P Farley Brook Panels 207P – 208P Farley Brook Split 1 Panels 209P Farrar Pond Brook Panels 210P – 211P Fort Meadow Brook Panels 212P – 217P
TABLE OF CONTENTS – Volume 5
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Fort Pond Brook Panels 218P – 225P Fort Pond Brook Branch 1 Panel 226P Fort Pond Brook Branch 2 Panel 227P Grassy Pond Brook Panels 228P – 229P Graves Pond Brook Panel 230P
iv
TABLE OF CONTENTS – Volume 5 – continued
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Great Road Tributary Panel 231P Greens Brook Panels 232P – 233P Guggins Brook Panels 234P – 236P Gumpas Pond Brook Panel 237P Hales Brook Panels 238P – 239P Halls Brook Panels 240P – 242P Hayward Brook Panels 243P – 244P Heath Brook Panels 245P – 246P Heath Hen Meadow Brook Panels 271P – 248P Heath Hen Meadow Brook Split Panels 249P Hobbs Brook 1 Panels 250P – 251P Hobbs Brook 2 Panels 252P – 253P Hog Brook Panels 254P – 255P Hop Brook Panels 256P – 260P Horn Pond Brook / Fowle Brook Panels 261P – 263P Inch Brook Panel 264P Ipswich River Panels 265P – 270P James Brook Panels 271P – 278P Jenny Dugan Brook Panels 279P – 280P Jones Brook Panels 281P – 282P Kiln Brook Panels 283P – 284P King Street Tributary Panels 285P – 286P Landham - Allowance Brook Panels 287P – 291P Lawrence Brook Panels 292P – 294P Little Brook Panel 295P Locke Brook Panels 296P – 297P Lower Spot Pond Brook Panel 298P Lubbers Brook Panels 299P – 304P Malden River Panels 305P – 307P Maple Meadow Brook Panels 308P – 310P Marginal Brook Panel 311P Marshall Brook Panels 312P – 314P Martins Brook Panels 315P – 317P
TABLE OF CONTENTS – Volume 6
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Martins Pond Brook Panels 318P – 319P Mascuppic Brook Panels 320P – 321P Mason Brook Panels 322P – 325P Meadow Brook Panels 326P – 327P
v
TABLE OF CONTENTS – Volume 6 – continued
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Meadow River Branch Panels 328P – 329P Merrimack River Panels 330P – 332P Mill Brook 1 Panels 333P – 335P Mill Brook 2 Panels 336P – 337P Mill Brook 3 Panels 338P – 341P Mill Pond Tributary Panels 342P – 343P Mill River Panels 344P – 346P Mineway Brook Panels 347P – 352P Mongo Brook Panels 353P – 354P Morse Brook Panel 355P Mowry Brook Panels 356P – 357P Mud Pond Brook Panel 358P Muddy Brook Panel 359P Mulpus Brook Panels 360P – 368P Munroe Brook Panels 369P – 371P Mystic River Panels 372P – 374P Nagog Brook Panels 375P – 377P Nashoba Brook Panels 378P – 381P Nashua River Panels 382P – 389P Nissitissit River Panels 390P – 392P Nonacoicus Brook 1 Panels 393P – 394P Nonacoicus Brook 2 Panel 395P North Lexington Brook Panels 396P – 398P Pages Brook Panels 399P – 401P Pages Brook Branch Panel 402P Pantry Brook Panels 403P – 405P Pearl Hill Brook Panels 406P – 409P Peppermint Brook Panel 410P Pine Brook Panel 411P Pole Brook Panels 412P – 415P Pratts Brook Panels 416P Putnam Brook Panels 417P Reedy Meadow Brook Panels 418P – 420P
TABLE OF CONTENTS – Volume 7
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Reservoir No. 1 - North Branch and Reservoir No. 3 Panels 421P – 422P Richardson Brook Panels 423P – 425P River Meadow Brook Panels 426P – 430P Run Brook Panels 431P – 433P
vi
TABLE OF CONTENTS – Volume 7
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Salmon Brook Panels 434P – 436P Sandy Brook Panels 437P – 438P Saugus River Panels 439P – 443P Saunders Brook Panel 444P Sawmill Brook 1 Panels 445P – 446P Sawmill Brook 2 Panel 447P Schneider Brook Panels 448P – 449P Shakers Glen Brook Panel 450P Shawsheen River Panels 451P – 457P Skug River Panels 458P – 459P Snake Brook Panels 460P – 461P South Meadow Brook - Paul Brook Panels 462P – 463P Spencer Brook Panel 464P – 467P Spring Brook Panels 468P – 470P Squannacook River Panels 471P – 477P Stony Brook Panels 478P – 479P Stony Brook 1 Panels 480P – 494P Stony Brook 2 Panels 495P – 501P Strong Water Brook Panels 502P – 503P Sudbury River Panels 504P – 513P Sutton Brook Panels 514P – 515P Sweetwater Brook Panel 516P Tadmuck Brook Panels 517P – 518P Tadmuck Swamp Brook Panel 519P
TABLE OF CONTENTS – Volume 8
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Taylor Brook Panel 520P Tributary 1 to Cole’s Brook Panel 521P Tributary 1 to Sudbury River Panel 522P Tributary 2 to Assabet River Panel 523P Tributary 2 to Tributary 1 to Cole’s Brook Panel 524P Tributary 3 to Bogle Brook 2 Panel 525P Tributary 4 to Bogle Brook 2 Panel 526P Tributary A to Cold Brook Panels 527P – 529P Tributary A to Course Brook Panel 530P Tributary A to Hop Brook Panels 531P – 532P Tributary A to Pantry Brook Panels 533P – 534P Tributary A to Squannacook River Panels 535P – 536P Tributary B to Hop Brook Panel 537P
vii
TABLE OF CONTENTS – Volume 8 – continued
EXHIBITS – continued
Exhibit 1 - Flood Profiles – continued Tributary B to Squannacook River Panels 538P – 539P Tributary B to Vine Brook Panels 540P – 541P Tributary C to Vine Brook Panels 542P – 543P Tributary to Beaver Brook 3 Panel 544P Tributary to Cold Spring Brook Panels 545P – 546P Tributary to Indian Brook Panel 547P Tributary to Martins Brook Panel 548P Tributary to Mill Brook Panels 549P – 552P Tributary to Nonacoicus Brook 1/Long Pond Brook Panels 553P – 557P Tributary to Waushakum Pond Panels 558P – 559P Trout Brook Panels 560P – 561P Trout Brook 1 Panel 562P Trout Brook 2 Panels 563P – 565P Trull Brook Panels 566P – 571P Trull Brook Tributary Panels 572P – 573P Unkety Brook Panels 574P – 576P Valley Pond Panel 577P Varnum Brook Panels 578P – 581P Vine Brook Panels 582P – 588P Walker Brook 1 Panels 589P – 591P Walker Brook 2 Panels 592P – 595P Walker Brook 3 Panels 596P – 598P Walkers Brook Panels 599P – 602P Wellington Brook Panel 603P West Chester Brook Panels 604P – 606P Whitehall Brook Panels 607P – 609P Willard Brook Panels 610P – 611P Winthrop Canal Panels 612P – 613P Witch Brook Panels 614P – 615P
Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map
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13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000 25000 26000 E
F STREAM DISTANCE IN FEET STREAM DISTANCE IN FEET ABOVE STATE BOUNDARY* *STATE BOUNDARY IS APPROXIMATELY 12,400 FEET DOWNSTREAM OF MAIN STREET 435P MASSAPOAG POND
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24000 25000 26000 27000 28000 29000 30000 E
F STREAM DISTANCE IN FEET STREAM DISTANCE IN FEET ABOVE STATE BOUNDARY* *STATE BOUNDARY IS APPROXIMATELY 12,400 FEET DOWNSTREAM OF MAIN STREET 436P 1% ANNUAL CHANCE BACKWATER FROM VINE BROOK
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0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH VINE BROOK 437P N
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5200 5600 6000 6400 6800 7200 7600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH VINE BROOK 438P
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0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 E STREAM DISTANCE IN FEET ABOVE COUNTY BOUNDARY* F *COUNTY BOUNDARY IS APPROXIMATELY 1,020 FEET DOWNSTREAM OF WATER STREET 439P 5
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10400 10800 11200 11600 12000 12400 12800 13200 13600 14000 14400 14800 15200 15600 E
F STREAM DISTANCE IN FEET ABOVE COUNTY BOUNDARY* *COUNTY BOUNDARY IS APPROXIMATELY 1,020 FEET DOWNSTREAM OF WATER STREET 441P 5
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15600 16000 16400 16800 17200 17600 18000 18400 18800 19200 19600 20000 20400 20800 E
F STREAM DISTANCE IN FEET ABOVE COUNTY BOUNDARY* *COUNTY BOUNDARY IS APPROXIMATELY 1,020 FEET DOWNSTREAM OF WATER STREET 442P 9
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20800 21200 21600 22000 22400 22800 23200 23600 24000 24400 24800 25200 25600 E STREAM DISTANCE IN FEET ABOVE COUNTY BOUNDARY* F *COUNTY BOUNDARY IS APPROXIMATELY 1,020 FEET DOWNSTREAM OF WATER STREET 443P 1% ANNUAL CHANCE BACKWATER FROM SHAWSHEEN RIVER
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0 500 1000 1500 2000 2500 3000 3500 4000 4500 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHAWSHEEN RIVER 444P Y
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0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 E
F STREAM DISTANCE IN FEET ABOVE DOWNSTREAM SIDE OF NOAH CLAPP DAM 445P Y
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2600 2800 3000 3200 3400 3600 E
F STREAM DISTANCE IN FEET ABOVE DOWNSTREAM SIDE OF NOAH CLAPP DAM 446P
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0 200 400 600 800 1000 1200 1400 1600 1800 2000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ABERJONA RIVER 448P T
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78000 79000 80000 81000 82000 83000 84000 85000 86000 E
F STREAM DISTANCE IN FEET ABOVE COUNTY BOUNDARY* *COUNTY BOUNDARY IS APPROXIMATELY 1,250 FEET DOWNSTREAM OF INTERSTATE 93 457P D
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F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MARTINS POND 458P Y
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E
D
1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 462P Y
D
U
D
T
A
S
O
T
D
R D
E
D
A
D
K
E
E
A
O
A
L
W
R
O
O
I
R
O
O
T
R
A
R
O
S
D D
T
S
L
R
A
N E
R
E
E
E
E
I
D
E
B
N
F
G
K M
F
Y
L
A
R
D
O
A
T
H
L
A
U
H
A
D
S
O
P
E
A
E
E
R
T
P
I
G
L
-
I
M
I
L
F
K
O
O
O
R
R
P
B
D
125 125 W
O
O
D
O
L A
E
F
M
)
8
8
H
T
D
V
U
A 120 120
O
N
(
S
T
E
E
F
N
I
N
O
I
T 115 115
A
V CULVERTS
E
L
E CULVERT
Y
CULVERT C
CULVERT N
110 110 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
105 105 O N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
H I J L CROSS SECTION LOCATION M
A
R
E
D
8000 8500 9000 9500 10000 10500 11000 11500 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 463P
1% ANNUAL CHANCE BACKWATER FROM SHAWSHEEN RIVER
E
D
R
H
G
A
2
E
T
D
O
6
I
I
V
I
R
R
E
W
R
B
T
A
E
N
U
C
D
C
I
E
O
E
N
R
E
R
E N
E
H
L
E
O
U
S
L
L
T
I
D
F
W
A
B
N
N
A
T
A
D S
O
H
S
B
L
S
C
E
A
O
K
L
I
O
F
O
R
O
B
R
P
G
N
I
D
120 120 R
O
P
S O
L
F
)
8
8
D
V
A 115 115
N
(
T
E
E
F
N
I
N
O
I
T 110 110
A
V
E
L
E
Y
C
N
105 105 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
100 100 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
95 L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
A B D E F G L C CROSS SECTION LOCATION M
A
R
E
D
0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHAWSHEEN RIVER 468P T
E
E
R
T
S
T
T
O
C
L
S
A
E
K
L
I
O
F
O
R
O
B
R
P
G
N
I
D
130 130 R
O
P
S O
L
F
)
8
8
D
V
A 125 125
N
(
T
E
E
F
N
I
N
O
I
T 120 120
A
V
E CULVERT
L
E
Y
C
N
115 115 E
G
A
A
T
M
N
E K L ,
)
Y
M
S
E
T
N
G
110 110 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
H I J L CROSS SECTION LOCATION M
A
R
E
D
4800 5200 5600 6000 6400 6800 7200 7600 8000 8400 8800 9200 9600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHAWSHEEN RIVER 469P Y
D
U
T
S
D
E
L
I
A
T
E
D
F
O
S
T
I
E
K
M
L
I
I
L
O
F
O
R
O
B
R
P
G
N
I
D
R
O
P
S O
L
F
)
8
8
D
V
A 135 135
N
(
T
E
E
F
N
I
N
O
I
T 130 130
A
V
E
L
E
Y
C
N
125 125 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N 120 G 120 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
M N O L CROSS SECTION LOCATION M
A
R
E
D
9600 10000 10400 10800 11200 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH SHAWSHEEN RIVER 470P 1% ANNUAL CHANCE BACKWATER FROM NASHUA RIVER
H
T
I
R
E
W
V
I
E
R
C
N
A
E
U
U
H
L
S
F
A
R
N
N
S
O
E
C
V E
I
L
R
I
F
K
O
O
O
R
C
P
A
N 230 230 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 220 220
N
(
T
E
E
F
N
I
N
O
I
T 210 210
A
V
E
L
E
Y
C
N
200 200 E
G
A
A
T
M
N
E B ,
)
Y
M
S
E
T
N
G
190 190 O N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
A L CROSS SECTION LOCATION M
A
R
E
D
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 471P 260 5 260
2
D
2
A
E
O
T
R
U
M M
N
O
A A
O
R
D D
T
E
O
T
R
A
R
G
T
S
E
250 S 250
V E
I
L
R
I
F
K
O
O
O
R
C
P
A
N 240 240 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 230 230
N
(
T
E
E
F
N
I
N
O
I
T 220 220
A
V
E
L
E
Y
C
N
210 210 E
G
A
A
T
M
N
E G ,
)
Y
M
S
E
T
N
G
200 200 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
C D E F L CROSS SECTION LOCATION M
A
R
E
D
13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000 25000 26000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 472P K
O
O
R
B
H
C
T
I
W
F
O
E
C
N
R
E
S
E
U
V E
L
I
F
L
R
I
N
O
F
K
C
O
O
O
R
C
P
A
N 270 270 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 260 260
N
(
T
E
E
F
N
I
N
O
I
T 250 250
A
V
E
L
E
Y
C
N
240 240 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
230 230 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
H J K L I CROSS SECTION LOCATION M
A
R
E
D
26000 27000 28000 29000 30000 31000 32000 33000 34000 35000 36000 37000 38000 39000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 473P HARBOR POND
T
E
E
R
T
M
S
A
H
D
T
U
O
R
S
S
E
V E
I
L
R
I
F
K
O
O
O
R
C
P
A
N 280 280 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 270 270
N
(
T
E
E
F
N
I
N
O
I
T 260 260
A
V
E
L
E
Y
C
N
250 250 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
240 240 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
L M N O P L CROSS SECTION LOCATION M
A
R
E
D
39000 40000 41000 42000 43000 44000 45000 46000 47000 48000 49000 50000 51000 52000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 474P
9
1
A
1
Y
R
E
E
R
T
V
A
I
U
T
S
3
R
O
U
1
N
K
I
R
T
B
I
E
O
A
E
D
E
T R
E
O
A
T
M
T
U
R
C
O
E
A
M
O
T
F
A
R
R
T
A
R
S
O
L
N
S
I
D
E
/
E
N
E
A
G
T
M
T
C
A
L
R
E
D
I A
E
U
N
E
R
T
R
E
Q
R
S
E
S
B
U
S
T
310 310
V E
L
S
I
O
F
L
T
N
N
R
I
I
O
A
F
K
C
M
O
O
O
R
C
P
A
N 300 300 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 290 290
N
(
T
E
E
F
N
I
N
O
I
T 280 280
A
V
E
L
E
Y
C
N
270 270 E
G
A
A
T
M
N
E T ,
)
Y
M
S
E
T
N
G
260 260 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
Q R S L CROSS SECTION LOCATION M
A
R
E
D
52000 53000 54000 55000 56000 57000 58000 59000 60000 61000 62000 63000 64000 65000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 475P
B
Y
R
E
R
V
A
I
T
R
D
U
A
K
B
O
I
O
R
R
O
T
E
C
F K
A
I
O
N
P
N
E
N
A
C
R
U
R
N
U
E
S
Q
T
E
U S
V E
L
I
O
F
L
R
T I
N
O
F
K
C
O
O
O
R
C
P
A
N 310 310 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 300 300
N
(
T
E
E
F
N
I
N
O
I
T 290 290
A
V
E
L
E
Y
C
N
280 280 E
G
A
A
T
M
N
E W X ,
)
Y
M
S
E
T
N
G
270 270 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
U V L CROSS SECTION LOCATION M
A
R
E
D
65000 66000 67000 68000 69000 70000 71000 72000 73000 74000 75000 76000 77000 78000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 476P 2
K
O
O
R
B
R
T
E
E
K
E
D
L
R
A
A
T
O
M
S
W
R
A
L
L
F
I
D
A
O
A
N
R
E
A
R
C
C
S
E
N
E
V E
I
U
L
L
R
I
F
N
F
K
O
O
O
C
O
R
C
P
A
N 320 320 D
N
O
A
O
U
L
Q
F
S
)
8
8
D
V
A 310 310
N
(
T
E
E
F
N
I
N
O
I
T 300 300
A
V
E
L
E
Y
C
N
290 290 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
280 280 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
Y Z L CROSS SECTION LOCATION M
A
R
E
D
78000 79000 80000 81000 82000 83000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUNCE WITH NASHUA RIVER 477P
1% ANNUAL CHANCE BACKWATER FROM CHARLES RIVER
R
E
T
V
E
I
E
R
R
S
T
E
S
L
R
H
A
T
H
U
C
O
S
T
A
T
A
H
S
T
R
I
50 U 50
E
E
1
O
L
W
I
M
K
F
O
O
O
R
R
B
P
Y
D 45 45 N
O
O
T
O
S
L
F
)
8
8
D
V
A 40 40
N
(
T
E
E
F
N
I
N
O
I
T 35 35
A
V
E
L
E
Y
C
N
30 30 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
25 25 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
L CROSS SECTION LOCATION M
A
R
E
D
0 200 400 600 800 1000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 480P 75 75
70 70
65 65 S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 60 60 N
O
O
T
O
S
L
F
)
8
8
D
V
A 55 55
N
(
T
E
E
F
N
I
N
O
I
T 50 50
A
V
E
L
E
Y
C
N
45 45 E
G
A
A
T
M
N
M
E
,
A
)
Y
D
M
S
E
R
T
I
N
G
O
40 40 O
N
V I
A
R
T
U
N
E LEGEND
C
I
S
A
O
E
0.2% ANNUAL CHANCE FLOOD D
R C
M
S
I
K
Y
R
X O 1% ANNUAL CHANCE FLOOD
C
U
O
E
J
R
N
S B 2% ANNUAL CHANCE FLOOD
L
E
L
35 Y
E
G
A
N
L
(
10% ANNUAL CHANCE FLOOD R
O
E
D
T
S
M
STREAM BED D
I
E
L CROSS SECTION LOCATION M
A
R
E
D
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 481P M
A
D
K
O
O
R
B
Y
N
O
S 75 T 75
S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 70 70 N
O
O
T
O
S
L
F
)
8
8
D
V
A 65 65
N
(
T
E
E
F
N
I
N
O
I
T 60 60
A
V
E
L
E
Y
C
N
55 55 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
50 50 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
L CROSS SECTION LOCATION M
A
R
E
D
3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 482P 100 100
CULVERT 95 95
90 90 S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 85 85 N
O
O
T
O
S
L
F
)
8
8
D
V
A 80 80
N
(
T
E
E
F
N
I
N
O
I
T 75 75
A
V
E
L
E
Y
C
N
70 70 E
T
G
0
S
2
D
A
O
E A
A
P
D
T
T
O
A
N
U
R
M
N
O
L
O
O
I
E
,
R
T
R
A D
S
)
Y
R
M
S
O
S
U
E
B
T
N
G
65 65 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
60 L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
A B C L CROSS SECTION LOCATION M
A
R
55 E
D
6200 6400 6600 6800 7000 7200 7400 7600 7800 8000 8200 8400 8600 8800 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 483P 100 100
95 95 S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 90 90 N
O
O
T
O
S
L
F
)
8
8
D
V
A 85 85
N
(
T
E
E
F
N
I
N
O
I
T 80 80
A
V
E
L
E
Y
C
N
75 75 E
G
D
D
A
A
A
A
T
O
O
R
R
M
N
L
L
I
I
E
,
A H I A
)
Y
R
R
M
S
E
T
N
G
O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
E F G L CROSS SECTION LOCATION M
A
R
E
D
8800 9000 9200 9400 9600 9800 10000 10200 10400 10600 10800 11000 11200 11400 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 484P 1
K
O
O
R
B
T
E
S
E
D
B
R
A
B
T
O
O
S
R
H
H
F
P
C
O
M
R
E
U
U
C
D
H
N
S
C
E
E
U
1
L
L
F
I
K
N
F
O
O
C
O
O
R
R
B
P
Y
D 100 100 N
O
O
T
O
S
L
F
)
8
8
D
V
A 95 95
N
(
T
E
E
F
N
I
N
O
I
T 90 90
A
V
E
L
E
Y
C
N
85 85 E
G
A
A
T
M
N
E Q ,
)
Y
M
S
E
T
N
G
80 80 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
J K L M N O P L CROSS SECTION LOCATION M
A
R
E
D
11400 11600 11800 12000 12200 12400 12600 12800 13000 13200 13400 13600 13800 14000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 485P S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D
N
O
O
T
O
S
L
F
)
8
8
D
V
A 105 105
N
(
T
E
E
F
N
I
N
O
I
T 100 100
A
V
E
L
E
Y
C
N
95 95 E
G
A
A
T
M
N
E S ,
)
Y
M
S
E
T
N
G
90 90 O N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
R L CROSS SECTION LOCATION M
A
R
E
D
14000 14200 14400 14600 14800 15000 15200 15400 15600 15800 16000 16200 16400 16600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 486P K
O
O
R
B
Y
R
T
R
E
D
E
E
A
H
R
O
C
T
R
S
F
L
I
O
S
A
E
E
L R
I
C
V
N
S
E
U
E
1
L
L
F
I
K
N
F
O
O
C
O
O
R
R
B
P
Y
D
N
O
O
T
O
S
L
F
)
8
8
D
V
A 115 115
N
(
T
E
E
F
N
I
N
O
I
T 110 110
A
V
E
L
E
Y
C
N
105 105 E
G
A
A
T
M
N
E Z ,
)
Y
M
S
E
T
N
G
100 100 O N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
95 L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
T U V W X Y L CROSS SECTION LOCATION M
A
R
90 E
D
16600 16800 17000 17200 17400 17600 17800 18000 18200 18400 18600 18800 19000 19200 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 487P D
A
O
R
T
N
A
N
O
C
S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D
N
O
O
T
O
S
L
F
)
8
8
D
V
A 125 125
N
(
T
E
E
F
N
I
N
O
I
T 120 120
A
V
E
L
E
Y
C
N
115 115 E
G
A
A
T
M
N
E AE ,
)
Y
M
S
E
T
N
G
110 110 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
105 L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AA AB AC AD L CROSS SECTION LOCATION M
A
R
100 E
D
19200 19400 19600 19800 20000 20200 20400 20600 20800 21000 21200 21400 21600 21800 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 488P T
E
E
R
T
S
M
A
I
R
R
E
S
M
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 135 135 N
O
O
T
O
S
L
F
)
8
8
D
V
A 130 130
N
(
T
E
E
F
N
I
N
O
I
T 125 125
A
V
E
L
E
Y
C
N
120 120 E
G
A
A
T
M
N
E AJ ,
)
Y
M
S
E
T
N
G
115 115 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
110 L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AF AG AH AI L CROSS SECTION LOCATION M
A
R
E
D
21800 22000 22200 22400 22600 22800 23000 23200 23400 23600 23800 24000 24200 24400 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 489P 150 150
145 145
140 140 S
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 135 135 N
O
O
T
O
S
L
F
)
8
8
D
V
A 130 130
N
(
T
E
E
F
N
I
N
O
I
T 125 125
A
V
E
L
E
Y
Y
C
D
U
N
7
T
E
E 1
S
1
G
U
D
N
E
A
E
E
T
A
L
I
V
U T
A
A
O
M
N
T
R
H
E
E
,
T
E
D
)
R
T Y
M
F
O
S
A
E
O
T
N
T
N
G
T
S
I
O
N
I
A
M
T
U
I LEGEND N
L
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AK AL AM AN L CROSS SECTION LOCATION M
A
R
E
D
24400 24600 24800 25000 25200 25400 25600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CHARLES RIVER 490P Y
D
U
T
S
D
D
A
E
O
L
I
R
A
R
T
E
E
D
W
O
F
T
O
S
T
190 I 190
E
1
M
L
I
I
K
L
F
O
O
O
R
R
B
P
Y
D 185 185 N
O
O
T
O
S
L
F
)
8
8
D
V
A 180 180
N
(
T
E
E
F
N
I
N
O
I
T 175 175
A
V
E
L
E
Y
C
N
170 170 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
165 165 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AO AP AQ L CROSS SECTION LOCATION M
A
R
E
D
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 E STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY* F *LIMIT OF DETAILED STUDY IS APPROXIMATELY 960 FEET DOWNSTREAM OF TOWER ROAD 491P E
V
I
R
D
E
T
A
V
I
R
P
D
220 D 220
E
A
D
A
V
O
A
I
O
R
O
R
R
R
L
D
L D
I
E
N
L
H L
T
E
I
O
A
E
F
V
C
L
C
I
L
N
R
R
I
A
E
L
P
I
S
B 215 P 215
E
1
L
I
K
F
O
O
O
R
R
B
P
Y
D 210 210 N
O
O
T
O
S
L
F
)
8
8
D
V
A 205 205
N
(
T
E
E
F
N
I
N
O
I
T 200 200
A
V
E
L
E
Y
C
N
195 195 E
G
A
A
T
M
N
E AV AW ,
)
Y
M
S
E
T
N
G
O 190 190 N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
185 E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AR AS AT AU L CROSS SECTION LOCATION M
A
R
E
D
2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 E STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY* F *LIMIT OF DETAILED STUDY IS APPROXIMATELY 960 FEET DOWNSTREAM OF TOWER ROAD 492P E
G
D
T T
I
E
R R
R
V
I
E E
D
B
R V V
A
T
L L
D
O
O
U U
R
E
O
C C
T
F
T
E E
A
R
N
I
N N
V
I
E
D
O O
R
D
T T
P
O
S
S S
O
E
1
W
L
I
K
F
O
O
O
R
R
B
P
Y
D 230 230 N
O
O
T
O
S
L
F
)
8
8
D
V
A 225 225
N
(
T
E
E
F
N
I
N
O
I
T 220 220
A
V
E
L
E
Y
C
N
215 215 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
210 210 O N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
AX AY AZ BA L CROSS SECTION LOCATION M
A
R
E
D
5200 5400 5600 5800 6000 6200 6400 6600 6800 7000 7200 7400 7600 E STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY* F *LIMIT OF DETAILED STUDY IS APPROXIMATELY 960 FEET DOWNSTREAM OF TOWER ROAD 493P Y
D
U
D
T
A
S
O
D
R
E
L
D
I
R
N
A
E
I
O
T
P
E
W
D
Y
D
F
N
O
S
A
T
I
S
E
1
M
L
I
I
K
L
F
O
O
O
R
R
B
P
Y
D
N
O
O
T
O
S
L
F
)
8
8
D
V
A 240 240
N
(
T
E
E
F
N
I
N
O
I
T 235 235
A
V
E
L
E
Y
C
N
230 230 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
225 225 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E
D
M
STREAM BED D
I
E
BB BC BD L CROSS SECTION LOCATION M
A
R
E
D
7600 7800 8000 8200 8400 E STREAM DISTANCE IN FEET ABOVE LIMIT OF DETAILED STUDY* F *LIMIT OF DETAILED STUDY IS APPROXIMATELY 960 FEET DOWNSTREAM OF TOWER ROAD 494P 115 115 1% ANNUAL CHANCE BACKWATER FROM MERRIMACK RIVER
110 110
105 105 S
E
2
L
I
K
F
O
O
O
R
R
B
P
Y
D 100 100 N
O
O
T
O
S
L
F
)
8
8
D
V
A 95 95
N
(
R
T
F
E
E
V
O
E
I
F
E
R
C
N
I K
N
C
E
N
A
U
O
I
L
M
I
T 90 F 90
R
A
N
R
V
O
E
E
C
L
M
E
Y
C
N
85 85 E
G
A
A
T
M
N
E H ,
)
Y
M
S
E
T
T
N
T
G
E
E
A
80 80 O
N
E
I
E
A
3
R
R
T
U
N
E
D
T
T LEGEND
D
D
C
T
I
S A
S A
O
A
A
U
O
D
O O 0.2% ANNUAL CHANCE FLOOD
N
X
O C
M
R
S
R
R
E
O
R I
L
L
L
I
S
I
T
I
Y
R
E
E
X
A E 1% ANNUAL CHANCE FLOOD
A
A
L
T
C
U
R
C
R
R
E
D
A
J
N
N
I
T
D
2% ANNUAL CHANCE FLOOD S
I
L
E
R
S
75 L
E
P
M
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E B D
M
STREAM BED D
I
E
A C D E F G L CROSS SECTION LOCATION M
A
R
70 E
D
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MERRIMACK RIVER 495P D
A
O
R
L
I
A
R
S
E
2
L
I
K
F
O
O
O
R
R
B
P
Y
D 110 110 N
O
O
T
O
S
L
F
)
8
8
D
V
A 105 105
N
(
T
E
E
F
N
I
N
O
I
T 100 100
A
V
E
L E CULVERT
Y
C
N
95 95 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
90 90 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
L
E
G
A
L
(
10% ANNUAL CHANCE FLOOD R
E J D
M
STREAM BED D
I
E
I K L CROSS SECTION LOCATION M
A
R
E
D
2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MERRIMACK RIVER 496P 3
D
E
A
T
O
U
R
O
L
I
R
A
S
R
U
S
E
2
L
I
K
F
O
O
O
R
R
B
P
Y
D 115 115 N
O
O
T
O
S
L
F
)
8
8
D
V
A 110 110
N
(
T CULVERT
E
E CULVERT
F
N
I
N
O
I
T 105 105
A
V
E
L
E
Y
C
N
100 100 E
G
A
A
T
M
N
E
,
)
Y
M
S
E
T
N
G
95 95 O
N
I
A
T
U LEGEND N
C
I
A
O
0.2% ANNUAL CHANCE FLOOD D
C
M
S
I
Y
R
1% ANNUAL CHANCE FLOOD X
C
U
E
J
N
2% ANNUAL CHANCE FLOOD S
L
E
90 L
E
G
A
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F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MERRIMACK RIVER 498P K
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0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 E
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0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 E
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0 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH ABERJONA RIVER 516P 1% ANNUAL CHANCE BACKWATER FROM STONY BROOK 2
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0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 E
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6500 7000 7500 8000 8500 9000 9500 10000 10500 11000 E
F STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH STONY BROOK 2 518P