Geography Lewiston, Idaho

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snake river watershed



clearwater river drainage

in north central idaho


lewiston located @ confluence of snake , clearwater rivers. west of lewiston smaller twin city of clarkston, washington. north-flowing snake river departs hells canyon , forms state boundary washington, while west-flowing clearwater river defines northern border of city. @ confluence @ city s northwest corner, lower snake river turns west washington, , after passing 4 dams, empties columbia river @ burbank.


thirty miles (50 km) northwest of city lower granite dam, last , upper-most of 4 dams on lower snake river, largest tributary of columbia river. completed 45 years ago in 1972 , raised river level lewiston, making eastern end of new reservoir, lower granite lake. because of these dams (and locks), lewiston navigable ocean-going vessels. @ 465 river miles (750 km) pacific ocean @ mouth of columbia river adjacent astoria, oregon, port of lewiston has distinction of being inland seaport east of west coast , idaho s seaport. barges of timber products, grain, , other goods shipped via snake-columbia system pacific ocean. lewiston s main industries agriculture, paper , timber products production @ mill owned , operated clearwater paper corporation (until december 2008, part of potlatch corporation), , light manufacturing.


along of snake river system of levees protect against flooding. of levees maintained u.s. army corps of engineers.


according u.s. census bureau, city has total area of 18.04 square miles (46.72 km), of 17.23 square miles (44.63 km) land , 0.81 square miles (2.10 km) water. downtown lewiston, @ 756 feet (230 m), higher in elevation river, 740 ft (226 m), thirty feet (9 m) lower prior completion of dam. away downtown terrain gains elevation quickly.


the heavily residential southern half of city referred orchards. area higher in elevation downtown, @ 1,400 ft (425 m), , named fruit orchards covered area. formerly unincorporated, annexed in late 1969, caused significant increase in city s population. there little sign of orchards today, although there wide proliferation of fruit trees in backyards of many residences in area of town. lewiston-nez perce county airport located on southwestern edge of plateau @ 1,438 feet (438 m) in elevation.


the lowest point in state of idaho located on snake river in lewiston, meets clearwater , flows west washington. populated areas in idaho lowest elevations along (or near) clearwater river, lowell (at 1,486 feet (453 m)) lewiston.








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