Stream Channels of the Northern Willamette Valley, Clackamas
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G E O L O G Y F A N O D T N M Open-File Report O-11-05 I E N M E T R R A A L STATE OF OREGON Stream Channels of the Northern Willamette Valley, P I E N Stream Channels of the Northern Willamette Valley, D D U DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES N S O Clackamas, Marion, Polk, Washington, T G R E I VICKI S. MCCONNELL, STATE GEOLOGIST R E S O Clackamas, Marion, Polk, Washington, and Yamhill Counties, Oregon and Yamhill Counties, Oregon by Daniel Coe 1937 2011 122°37'30"W 123°15'0"W 123°10'0"W 123°0'0"W 122°50'0"W 122°40'0"W B Y a m h il l l C r e 45°22'21"N k k e 45°22'21"N e B e k C e e r a r k C e C d C r l t n h C e k a la h r S a e e w e h e Tualatin le r o k m C 1 R 4 1 - e R O d d R Sherwood y h r r e F s s a e n o o l B e West Linn m T u M B Washington County a E l A a o Yamhill County V t E i n R u T R O i N v YAMHILL-NEWBERG OR-2 e 40 n - T r U y t y Yamhill t A t n L n A a u u T o o N i I C N o r n C t n h s O o s a t Y C R g m - a h k 1 e n m e re a h C i 4 R k k 1 a oc h h l c Oregon e s i m a l a l C C 45°20'0"N l r W City 45°20'0"N e e R k i v e r E 9 9 - R O T T S A E Y Y A W H G I H C C I F I C 7 A 4 P - R O Y Y E L Wilsonville L k A e ty e y V r n t u C n N N I s o T s e C A H s s L Cou a l l A l i U Newberg m h T a k m c a Bronson Creek a Y l C Creek vey Carlton Har PACIFIC I-5 PACIFIC Dundee Clackamas County Marion County k e e r ounty C Yamhill C n n a nty c Marion Cou M illi Canby Hess C 9 re 1 e 2 k - R O M o N N la O ll T a R R i E v e V r L I S - k O ee Dee Cr R r O B S L Barlow L I H Lafayette e r R i v a l l l a o eek M Milk Cr ree k g C N oe o p r m th a Y h am C h il 3 l 3 River 2 - ission C ek R M r e O 8 r -1 R e O v R i Baker e E Cr ek IV R R N olal O l M la M l Ri L i Aurora ve SA r h m a Y mhill Willamette River Ya County Marion County Donald Dayton WILSONVILLE-HUBBARD OR-551 ver Ri ll hi m Ya D o h h t u St. v o S e Paul Cree k McMinnville G r ib ble Cr ee k SALMON RIVER OR-18 k e e r River C g n e e i s M d k C d i u a l l Cree l C a P c k a ek M Coz Senecal Cre m ine Creek a a r i s o n n C C o o u u n n t y ty SALEM-DAYTON OR-221 Hubbard k u e C So th Ya mhill River e re r am C ery r r C e reek m l a P i v e r Ya R t h m r o u h i l l S e v i R st F Creek We ork Pa mer Lam g l be rt n S i Be l a o r u d Cree k 45°10'0"N g 45°10'0"N h d u P k e re C 3 e 3 t -2 t R u O B N TO Y P ddin DA u g River Y- IT AM Woodburn Rock C r 4 WOODBURN-ESTACADA OR-211 e 5 e k 1 - R e O r Cre k Kaise E E T T E Y A F A L R k e o e r c k C Cre g g ek e o p m a h E C s t ld a ri E Amity ed C g e lac S ka l m o a u M s C g a o h r u io nt n C y ou nty E Gervais Pat terso o n C reek Yamhill County r ion County Salt C e Mar r v eek l BELLEVUE-HOPEWELL OR-153 i R e t t a e m a l l i W Co eek m Cr k e e r e r C l t a H S iver g R Puddin 45°4'56"N i 122°37'30"W k e Yamhill County e l r Polk County C m m a u q r a l M Mt. Angel B 122°40'0"W s u tt e C r e e k e l a w S h h s A ek es Cre Carn OREGON Z olln g Va er C in ll r r ey C eek p r S e ek iver Ath ing R e Creek dd y u P Clatsop Columbia County County HILLSBORO-SILVERTON OR-214 Tillamook County Hood River Washington Multnomah County County County e g Clackamas A ek n biqua Cre County A a Yamhill Map A R County Area e t Wasco g s County Marion n a Polk County a o County R C Linn Jefferson e Lincoln Benton County County County d 13 County -2 OR a H UT SO c Y s HW DE A a SC r A e C Map Symbols C v Lane i ch R Dit County h g abis L n Lake i k d ee d r County Boundary Deschutes L u C i P e tt le i Willamette River County r O i k Mclaine W a ee R r r - i C 2 l P r 1 l l Silve a l 3 City Boundary Basin m e w e Che o t mawa t Rd OR-99EB e e H R Keizer Silverton i v e C Highway r l ag g e t t C 45°0'0"N 45°0'0"N r e ek e re k Street er C Walk E Douglas County Klamath A A Cross Section Coos County County o C rowley Creek l a tt Creek gge Cla 122°50'0"W Scale 1:36,000 0 2 4 Miles H F r uitland C ree Silverton Rd OR- k 0 3 6 Kilometers i 213 y l y t t n n u u o o C C n n k k l o l i o r P a This map depicts the Willamette River as it flows from the south through Salem toward Oregon City in the northeast. To emphasize the fluvial features present in the Willamette Valley, a blue gradient was applied to the Willamette, M s This region, known as the northern Willamette Basin, is bounded to the north by the Chehalem Mountains, to the east Yamhill (North and South), Pudding, Molalla, and Tualatin rivers to represent the relative elevation of the floodplain SALEM OR-99EB by the Cascade Range foothills, to the south by the Waldo Hills and Salem Hills, and to the west by the Eola Hills and above the adjacent river. This enhanced view shows the complex history of channel migration that occurred in the Baskett Slough Lancaster DrOR-213 the Coast Range. Urban centers in this region include the state capitol, Salem, as well as McMinnville, Newberg, northern Willamette Basin after the floods came to an end. This gradient is especially revealing in the Willamette River Glenn Creek Wilsonville, and Oregon City. This area encompasses fertile farmlands in the lowlands and productive vineyards in the floodplain from Salem north to the confluence with the Yamhill River, where the gradient highlights lateral and h anc western hills. Much of this region’s fertility is a result of sediments left behind by Pleistocene age floods, known as the y Br seasonal channels, oxbow lakes, and the pattern of movement the river has taken over the past twelve millennia. Nar Mc Missoula Floods, which occurred between 15,000 and 12,700 years before present (O’Connor and others, 2001). Outside of the major floodplains, colors represent a standard elevation gradient fading from cool greens in the lowland Evidence of the Missoula floods is seen in many places in the northeast corner of the map (Allison, 1978).