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DOGAMI Open-File Report O-11-14, Stream Channels of the Central

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DOGAMI Open-File Report O-11-14, Stream Channels of the Central G E O L O G Y F A N O D T N M Open-File Report O-11-14 I E N M E T R R A A L STATE OF OREGON Stream Channels of the Central Willamette Valley, P I Stream Channels of the Central Willamette Valley, E N D D U DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES N S Benton, Linn, Marion, and Polk Counties, Oregon O T G R E I VICKI S. MCCONNELL, STATE GEOLOGIST R E S O Benton, Linn, Marion, and Polk Counties, Oregon by Daniel E. Coe Oregon Department of Geology and Mineral Industries 1937 2011 B 123°23'17"W 123°20'0"W 123°10'0"W 123°0'0"W 122°52'33"W F k ru Clatsop Columbia ree i C tla Map Symbols County County 44°54'17"N n n N oh d orth ij C For tt r k Ash C e ee reek P k County Boundary Street 1 -5 Tillamook R County O Hood River Y Y Washington Multnomah A A A Cross Section County County W M City Boundary County H ill C e G I r ee H k g E E C Highway n Clackamas N E County D ty a n N u ty Yamhill E o n P C u o Salem R County E l k C D o n n N P o I ri a M t Wasco s Marion County 0 1 2 Miles County g e a Polk H n a County o y a d Map e n n C S R l o Jefferson u Area g 0 1.5 3 Kilometers County h Lincoln Benton Linn County e Waln Creek County County Scale 1:36,000 d a 3 c 2 2 Mid - dle R roisan s O Fork C Creek A Y s A h Lane a W C H re County G e Jory Creek I C H k S Y Y E L Willamette Deschutes L A County V a S S River G IN K l OREGON Basin ek re C rn e e F Sou Douglas th Fo Independence rk A County sh m C Klamath reek County MONMOUTH-INDEPENDENCE HIGHWAY OR-51 Monmouth Coos County H Turner 44°50'55"N i l Aumsville Mill C MONMOUTH HIGHWAY OR-194 l reek N Battle Cre O ek R s TH W SA il N 44°50'26"N ker T son IA C M r H ee IG k H W AY O R - 22 This map depicts the Willamette River 44°50'0"N as it flows from the south past Corvallis toward Salem to the north. This region, known Sublimity as the Central Willamette Valley, is bound to the north by the Salem Hills, to the east by the Cascade Range foothills, and to the west by the Coast Range. Cities in this region include Corvallis, Albany, Porter C ree M reek k Lebanon, Stayton, and Monmouth-Independence. This area encompasses fertile farmlands in the low- arion C dgers C ounty Ro Polk lands, productive vineyards in the western hills, and dense forest in the Cascade Range. Much of the County region’s fertility is a result of sediments left behind by ice age floods, known as the Missoula Floods, that occurred between 15,000 and 12,700 years ago (O’Connor and others, 2001). To show the complex history of channel formation and migration that occurred in the Central Willamette Valley after the floods ended, a blue gradient was applied to the floodplains of the Willamette, Santiam, North Santiam, South Santiam, Luckiamute, Marys, and Calapooia rivers and to the Muddy, Crabtree, and Thomas creeks. This gradient shows the relative elevation of the floodplain above the adjacent channels. The color ramp is especially revealing at the confluence of the Willamette and Santiam rivers, where it highlights lateral and seasonal channels, oxbow lakes, and the pattern of movement the river has taken over the past 12,000 years. The gradient also shows the highly interconnected stream networks of the Willamette River southeast of Corvallis and S id n the South Santiam River north of Lebanon. e k y y P e e Stayton r o w C e r r r le Outside of the major floodplains, colors represent a standard elevation gradient changing from cool greens in low- D il i M Salem Ditch tc land valleys to warm oranges in the uplands. This gradient emphasizes smaller stream drainages in the valley as well h as the hills and mountains that divide sub-basins. i v e r R t e t ek Main Cana Color gradients were applied to digital elevation models (DEMs) that were created using three-foot resolution bare- e Cook Cre l earth lidar data. Transparent shaded relief and shaded slope layers derived from lidar were also draped on top of the m l a l DEMs. Separate lidar data were applied to areas that fell within city limits to show man-made development patterns in i W relation to the natural landscape. First–return lidar data, also known as highest-hit lidar data, were used to create DEM, shaded relief, and shaded slope layers that were applied to the city limits. This technique reveals man-made structures as J well as vegetation patterns within the city limits. Two elevation cross sections represented by letter labels and arrows on o h n s o n the map are located below the main map. These cross sections are vertically and horizontally exaggerated in order to better H visually represent physical features of the area. i l l Reference: McKinney C O’Connor, J. E., Sarna-Wojcicki, A., Wozniak, K. C., Polette, D. J., and Fleck, R. J., 2001, Origin, extent, and thickness of Quater- reek nary geologic units in the Willamette Valley, Oregon: U.S. Geological Survey Professional Paper 1620, 51 p. B ashaw Creek Marion Ditch Chehulpum Cree J k E F Bear Branch F a m u t e E k i R i v R u c e S L r O N N H I G H W E A 9 Y 9 - O R R O - 1 i v e r 5 5 6 R - 4 I reek m gan C a Y Y Mor i A t n W a S a n t i a m H S R G i v I e H r C I F I C A W P 9 9 - R O Y Y A W S y Pow o ne er H id D a y S it G t ch k I p n e C ou re H r e C ty C e n n T T k a k ol ou lm S l P C ma E nn S lough Li Sucker S W Y Y A W H G I H C C I F I C A P Polk County Benton County a s C r m e e Jefferson o k h T ty Ditch n fferson u Je o ty C n u n n o io r C a n M in L W Mill Creek i l Scio l a m e s Ditch t Peter t e R i v e r Crooks Creek F r a n B k u l 1% Chance t i t n Flood Zone e Floodplains Millersburg The floodplains (in blue) on the main map and shown above are not equivalent to flood zones. Red Adair 6 Village 2 indicates the extent of the 100-year flood modeled by the Federal Emergency Management Agency 2 - R (2003, 2006, 2011). The 100-year flood has a 1% chance of occurring every year and defines the O y Y FEMA 1% chance flood insurance zone. r A B W o w g H er G I s s n S l H l u o S u l 44°40'0"N N gh H i 44°40'0"N O H Y L - Y N A B L A e k r e C Tru x e ax Cr t r e eek o a b 123°20'0"W n t e C r K t u B d E 9 r 9 reek - n zier C R a ra F O M i ill C y Y reek a A S e W o t H u n IG t n H h i Y u IT S V C a o N n TIO t i NC a M -JU m NY BA AL R i v 20 S- e U rkha r M AY Bu rt C ou W re nta iew Cree H ek in V k IG H IS LL VA R O C Albany Co Y- x Creek A N A LB A e l p Jackson Creek m l l S i pring Branch i P D eri H wink le C re e k 44°36'32"N ntiam Canal Albany Sa o k Stewart Sl ugh k Cree A Oa A ld er S Cr A ee N k T IA M M H IG H W A i v e r Y R U t t e S e - a m 2 i l l 0 W The areas of the map highlighted in blue were Oa k Cre ty ek un chosen for their visual impact and ability to reveal Co on y nt nt ek Be ou current and historical channels and stream morphology.
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