List of dams in the Columbia River watershed

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Dams of the Columbia River Basin. Click to view higher resolution and read legend.

What follows are lists of the dams that are found in the Columbia River watershed. Tributaries of the Columbia and their dammed tributaries, as well as the main stem itself, each have their own list. The dams are listed in the order as they are found from source to terminus. Many of the dams in the Columbia River watershed are not created for water storage or flood protection. Instead, the primary purpose of these dams is hydroelectric power production. As can be seen in the lists, these dams provide a relatively significant amount of power.

Major dam construction began in the early 20th century, and finished toward the end of the same century. Including just the dams listed below, there are sixty dams in the watershed, with fourteen on the Columbia, twenty on the Snake, seven on the Kootenay, seven on the Pend Oreille / Clark, two on the Flathead, eight on the Yakima, and two on the Owyhee. Averaging a major dam every seventy-two miles, the rivers in the Columbia watershed combine to create over 36,000 megawatts of power, with the majority coming on the main stem. Grand Coulee Dam is the largest producer of hydroelectric power in the nation,[1] creating 6,809 megawatts, over one-sixth of all power in the basin.

In addition to providing ample power for the people of the Pacific Northwest, the reservoirs created by the dams have created numerous recreational opportunities, including fishing, boating, and windsurfing. Furthermore, by creating a constant flow and consistent depth along the river channel, the series of locks and dams have allowed for Lewiston, Idaho to become the furthest inland seaport on the west coast of the United States.[2] Despite the numerous benefits to humans that the dams have given, a number of environmental consequences have manifested as a result of the dams, including a negative impact on salmonid populations of the basin.[3]

The organization of the following lists begins with the Columbia and is followed by its tributaries in order of length. Additionally, the table of contents below is indented to indicate tributary status of each river.

Mainstream Columbia River Dams[edit]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Mica Dam 240 m (790 ft)[4] 1,805[5]  British Columbia 52°04′39″N 118°33′59″W / 52.07750°N 118.56639°W / 52.07750; -118.56639 1973 BC Hydro Kinbasket Lake MicaDam.JPG
Revelstoke Dam 175 m (574 ft)[6] 2,480[5]  British Columbia 51°02′57″N 118°11′36″W / 51.04917°N 118.19333°W / 51.04917; -118.19333 1984 BC Hydro Revelstoke Lake Aeriel picture, Revelstoke Dam.jpg
Keenleyside Dam 52 m (171 ft)[7] 185[8]  British Columbia 49°20′18″N 117°46′18″W / 49.33833°N 117.77167°W / 49.33833; -117.77167 1968 BC Hydro Raised Arrow Lakes Hugh Keenlyside Dam (104940381).jpg
Grand Coulee Dam 550 ft (170 m)[9] 6,809[9]  Washington 47°57′26″N 118°58′39″W / 47.95722°N 118.97750°W / 47.95722; -118.97750 1941 / 1974 [n 1] USBR Franklin D. Roosevelt Lake GrandCouleeDam2USBORJune2011.jpg
Chief Joseph Dam 236 ft (72 m)[10] 2,620[11]  Washington 47°59′42″N 119°38′19″W / 47.99500°N 119.63861°W / 47.99500; -119.63861 1955 USACE Rufus Woods Lake Chief Joseph Dam.jpg
Wells Dam 840[12]  Washington 47°56′50″N 119°51′51″W / 47.94722°N 119.86417°W / 47.94722; -119.86417 1967 Douglas PUD Lake Pateros Wellsdam-bpa.jpg
Rocky Reach Dam 1,287[13]  Washington 47°31′59″N 120°17′41″W / 47.53306°N 120.29472°W / 47.53306; -120.29472 1961 Chelan PUD Lake Entiat RockyReachDam.jpg
Rock Island Dam 660[14]  Washington 47°20′33″N 120°05′40″W / 47.34250°N 120.09444°W / 47.34250; -120.09444 1933[15] Chelan PUD Rock Island Pool ROCK ISLAND DAM IS THE OLDEST DAM ON THE COLUMBIA RIVER - NARA - 548012.jpg
Wanapum Dam 185 ft (56 m)[16] 1,092[16]  Washington 46°52′40″N 119°58′13″W / 46.87778°N 119.97028°W / 46.87778; -119.97028 1963 Grant PUD Lake Wanapum Aerial - Wanapum Dam to Vantage, WA, Columbia River 01 - white balanced (9793434594).jpg
Priest Rapids Dam 178 ft (54 m)[17] 955.6[18]  Washington 46°38′39″N 119°54′36″W / 46.64417°N 119.91000°W / 46.64417; -119.91000 1961 Grant PUD Priest Rapids Lake PrstRpdsDam1.jpg
McNary Dam 183 ft (56 m)[19] 1,133[20]  Washington /
 Oregon border
45°56′07″N 119°17′53″W / 45.93528°N 119.29806°W / 45.93528; -119.29806 1954 USACE Lake Wallula McNary Dam, Umatilla, Oregon.jpg
John Day Dam 184 ft (56 m) 2,485[21]  Washington /
 Oregon border
45°42′57″N 120°41′37″W / 45.71583°N 120.69361°W / 45.71583; -120.69361 1971 USACE Lake Umatilla John day dam 1998 COE.jpg
The Dalles Dam 260 ft (79 m) 2,038[22]  Washington /
 Oregon border
45°36′50″N 121°08′02″W / 45.61389°N 121.13389°W / 45.61389; -121.13389 1957 USACE Lake Celilo The Dalles Dam USGS.jpg
Bonneville Dam 197 ft (60 m)[23] 1,190[24]  Washington /
 Oregon border
45°38′42″N 121°56′27″W / 45.64500°N 121.94083°W / 45.64500; -121.94083 1937 USACE Lake Bonneville Corps-engineers-archives bonneville dam looking east.jpg

Snake River Dams[edit]

Note: Dams are listed in order from headwater (Jackson Lake, WY) to mouth (Columbia River, WA).

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Jackson Lake Dam 65.5 ft (20.0 m)[25] n/a[26]  Wyoming 43°51′30″N 110°35′24″W / 43.85833°N 110.59000°W / 43.85833; -110.59000 1911 / 1916 / 1989[n 2] USBR Jackson Lake Jackson Lake and Jackson Lake Dam, Grand Teton National Park 20110818 1.jpg
Palisades Dam 270 ft (82 m)[27] 176.6[27]  Idaho 43°19′59″N 111°12′12″W / 43.33306°N 111.20333°W / 43.33306; -111.20333 1957 USBR Palisades Reservoir Palisades.jpg
Gem State Dam 40 ft (12 m) 22.6[28]  Idaho 43°25′19″N 112°06′08″W / 43.42194°N 112.10222°W / 43.42194; -112.10222 1982 City of Idaho Falls
American Falls Dam 104 ft (32 m)[29] 92[30]  Idaho 42°46′43″N 112°52′35″W / 42.77861°N 112.87639°W / 42.77861; -112.87639 1927 / 1978[n 3] USBR American Falls Reservoir American Falls Dam.jpg
Minidoka Dam 86 ft (26 m)[31] 28.5[31]  Idaho 42°40′10″N 113°29′03″W / 42.66944°N 113.48417°W / 42.66944; -113.48417 1909-1942[31] USBR Lake Walcott MinidokaDam2005USBOR.jpg
Milner Dam 38 ft (12 m)[32] 59.5[33]  Idaho 42°31′30″N 114°00′35″W / 42.52500°N 114.00972°W / 42.52500; -114.00972 1905 Milner Dam, Inc. Milner Lake Milner-dam-id-us.jpg
Twin Falls Dam 25 ft (7.6 m)[n 4] 52.9[34]  Idaho 42°35′21″N 114°21′20″W / 42.58917°N 114.35556°W / 42.58917; -114.35556 1935 / 1995[n 5] Idaho Power Company Twin Falls Reservoir[n 6] Twin Falls Dam 1989.jpg
Shoshone Falls Dam 16 ft (4.9 m)[35] 64[36]  Idaho 42°35′47″N 114°24′04″W / 42.59639°N 114.40111°W / 42.59639; -114.40111 1907[36] Idaho Power Company Shoshone Falls Reservoir 2013-07-07 17 41 52 Shoshone Falls in Idaho viewed from the northwest.jpg
Upper Salmon Falls Dam 18 ft (5.5 m)[n 7] 34.5[33]  Idaho 42°45′59″N 114°53′45″W / 42.76639°N 114.89583°W / 42.76639; -114.89583 1937 / 1947[n 8] Idaho Power Company Upper Salmon Falls Reservoir[n 9]
Lower Salmon Falls Dam 38 ft (12 m)[37] 60[33]  Idaho 42°50′30″N 114°54′54″W / 42.84167°N 114.91500°W / 42.84167; -114.91500 1910 / 1949[n 10] Idaho Power Company Lower Salmon Falls Reservoir
Bliss Dam 84 ft (26 m)[37] 75[33]  Idaho 42°54′49″N 115°04′16″W / 42.91361°N 115.07111°W / 42.91361; -115.07111 1950 Idaho Power Company Bliss Reservoir
C. J. Strike Dam 115 ft (35 m) 82.8[38]  Idaho 42°56′51″N 115°58′31″W / 42.94750°N 115.97528°W / 42.94750; -115.97528 1952[38] Idaho Power Company C. J. Strike Reservoir
Swan Falls Dam 107 ft (33 m) 0[n 11]  Idaho 43°14′35″N 116°22′46″W / 43.24306°N 116.37944°W / 43.24306; -116.37944 1901 Idaho Power Company Swan Falls Reservoir[n 12] Swan Falls Dam Before Sunrise.jpg
Brownlee Dam 420 ft (130 m)[40] 585[41]  Idaho /
 Oregon border
44°50′13″N 116°54′03″W / 44.83694°N 116.90083°W / 44.83694; -116.90083 1959 / 1980[n 13] Idaho Power Company Brownlee Reservoir Brownlee.jpg
Oxbow Dam 175 ft (53 m)[42] 220[43]  Idaho /
 Oregon border
44°58′15″N 116°50′07″W / 44.97083°N 116.83528°W / 44.97083; -116.83528 1961 Idaho Power Company Oxbow Reservoir Oxbowdam.jpg
Hells Canyon Dam 330 ft (100 m)[44] 450[45]  Idaho /
 Oregon border
45°14′34″N 116°42′05″W / 45.24278°N 116.70139°W / 45.24278; -116.70139 1967 Idaho Power Company Hells Canyon Reservoir Hells Canyon Dam - 2.jpg
Lower Granite Dam 181 feet (55 m)[46] 932[47]  Washington 46°39′40″N 117°25′41″W / 46.66111°N 117.42806°W / 46.66111; -117.42806 1975 / 1987 [n 14] USACE Lower Granite Lake LwrGrDam2.jpg
Little Goose Dam 253 ft (77 m)[49] 932[50]  Washington 46°35′13″N 118°01′40″W / 46.58694°N 118.02778°W / 46.58694; -118.02778 1970 USACE Lake Bryan LGLandDam2.jpg
Lower Monumental Dam 152 ft (46 m)[51] 930[52]  Washington 46°33′48″N 118°32′20″W / 46.56333°N 118.53889°W / 46.56333; -118.53889 1969 USACE Lake Herbert G. West LwrMnDam2.jpg
Ice Harbor Dam 213 ft (65 m)[53] 693[54]  Washington 46°14′58″N 118°52′47″W / 46.24944°N 118.87972°W / 46.24944; -118.87972 1961 / 1976 [n 15] USACE Lake Sacajawea IcHrbrDam2.jpg

Owyhee River Dams[edit]

Note: Dams are listed in order from headwater (northeastern Nevada) to mouth (Snake River, OR)

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Wild Horse Dam 101 ft (31 m)[55] 0  Nevada 41°41′14″N 115°50′43″W / 41.68722°N 115.84528°W / 41.68722; -115.84528 1937 / 1969[n 16] BIA[57] Wild Horse Reservoir 2014-08-19 13 19 36 Wild Horse Dam, Nevada.JPG
Owyhee Dam 417 ft (127 m)[58] 4.3[59]  Oregon 43°38′31″N 117°14′33″W / 43.64194°N 117.24250°W / 43.64194; -117.24250 1932[58] USBR Lake Owyhee DAM AFTERBAY, WITH OWYEE RIVER IN FOREGROUND, SHOWING OUTLET TUNNEL PORTAL (LEFT) AND POWERHOUSE AND ENTRANCE PORTAL TO DAM INTERIOR (RIGHT). NOTE RELEASE OF WATER FROM NEEDLE HAER ORE,23-NYS.V,1-6.tif

Kootenay River Dams[edit]

Note: Dams are listed in order from headwater (Canadian Rockies) to mouth (Columbia River, BC).

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Libby Dam 420 ft (130 m)[60] 604[61]  Montana 48°24′37″N 115°18′52″W / 48.41028°N 115.31444°W / 48.41028; -115.31444 1972[62] USACE Lake Koocanusa Libby Dam (Libby Montana) 1986.jpg
Corra Linn Dam 16 m (52 ft)[63] 51[63]  British Columbia 49°28′04″N 117°28′02″W / 49.46778°N 117.46722°W / 49.46778; -117.46722 1932[63] FortisBC raised Kootenay Lake Corra Linn Dam 20140902.jpg
Upper Bonnington Falls Dam 21 m (69 ft)[64] 53[8]  British Columbia 49°27′35″N 117°29′03″W / 49.45972°N 117.48417°W / 49.45972; -117.48417 1907[8] FortisBC
Lower Bonnington Falls Dam 21 m (69 ft)[65] 25[8]  British Columbia 49°27′39″N 117°29′59″W / 49.46083°N 117.49972°W / 49.46083; -117.49972 1925[8] FortisBC Lower Bonnington Falls Power House.jpg
South Slocan Dam 18 m (59 ft)[66] 57[8]  British Columbia 49°27′20″N 117°31′11″W / 49.45556°N 117.51972°W / 49.45556; -117.51972 1928[8] FortisBC
Kootenay Canal Generating Station[n 17] 84 m (276 ft)[67] 583[8]  British Columbia 49°27′10″N 117°31′02″W / 49.45278°N 117.51722°W / 49.45278; -117.51722 1976[8] BC Hydro Kootenay Canal.jpg
Brilliant Dam 42.6 m (140 ft)[68] 260[n 18]  British Columbia 49°19′29″N 117°37′12″W / 49.32472°N 117.62000°W / 49.32472; -117.62000 1944 / 2007[n 19] Columbia Power Corporation Brilliant Dam.jpg

Pend Oreille River / Clark Fork River Dams[edit]

Note: Dams are listed in order from headwater of Clark Fork River (Southwestern Montana) to mouth of Pend Oreille River (Columbia River, BC).[n 20]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Clark Fork
Noxon Rapids Dam 260 ft (79 m)[69] 527[70]  Montana 47°57′39″N 115°44′01″W / 47.96083°N 115.73361°W / 47.96083; -115.73361 1959[71] Avista Corp. Noxon Reservoir Noxon Reservoir.JPG
Cabinet Gorge Dam 208 ft (63 m)[72] 255[73]  Idaho 48°05′08″N 116°03′27″W / 48.08556°N 116.05750°W / 48.08556; -116.05750 1952[73] Avista Corp. Cabinet Gorge Reservoir HD.11C.084 (14740078038).jpg
Pend Oreille
Albeni Falls Dam 90 ft (27 m)[69] 42[69]  Idaho 48°10′48″N 116°59′59″W / 48.18000°N 116.99972°W / 48.18000; -116.99972 1955 USACE Raised Lake Pend Oreille 11.5 ft (3.5 m)[74] USACE Albeni Dam Idaho.jpg
Box Canyon Dam 62 ft (19 m)[69] 69[69]  Washington 48°46′49″N 117°24′46″W / 48.78028°N 117.41278°W / 48.78028; -117.41278 1956[75] Pend Oreille PUD Box Canyon Reservoir Box Canyon Dam WA Aerial.jpg
Boundary Dam 340 ft (100 m)[69] 1,040[69]  Washington 48°59′13″N 117°20′53″W / 48.98694°N 117.34806°W / 48.98694; -117.34806 1967 Seattle City Light Boundary Lake
Seven Mile Dam 79.2 m (260 ft)[76] 848  British Columbia 49°01′49″N 117°30′13″W / 49.03028°N 117.50361°W / 49.03028; -117.50361 1979[77] BC Hydro
Waneta Dam 75.9 m (249 ft)[76] 450[78]  British Columbia 49°00′14″N 117°36′42″W / 49.00389°N 117.61167°W / 49.00389; -117.61167 1954[76] Teck Resources

Flathead River Dams[edit]

Note: Dams are listed in order from headwater (Canadian Rockies) to mouth (Clark Fork River).[n 21]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Hungry Horse Dam[n 22] 564 ft (172 m)[79] 428[80]  Montana 48°20′28″N 114°00′47″W / 48.34111°N 114.01306°W / 48.34111; -114.01306 1953[81] USBR Hungry Horse Reservoir Hngryh2.jpg
Kerr Dam 205 ft (62 m)[82] 188[83]  Montana 47°40′38″N 114°14′02″W / 47.67722°N 114.23389°W / 47.67722; -114.23389 1938[81] PPL/Tribal Raised Flathead Lake 10 ft (3.0 m)[81] 2011-06-07 17-17-11 996.jpg

Yakima River Dams[edit]

Note: Dams are listed in order from headwater (Keechelus Lake) to mouth (Columbia River, WA).

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Keechelus Dam 128 ft (39 m)[84] 0[85]  Washington 47°19′20″N 121°20′22″W / 47.32222°N 121.33944°W / 47.32222; -121.33944 1917[84] USBR Raised Keechelus Lake Photographic copy of photograph, photographer unknown, date unknown (original print located at U.S. Bureau of Reclamation Pacific Northwest Region Office, Boise, Idaho). Aerial view, HAER WA-80-49.tif
Easton Diversion Dam 66 ft (20 m)[86] 0[85]  Washington 47°14′30″N 121°11′17″W / 47.24167°N 121.18806°W / 47.24167; -121.18806 1929[87] USBR Lake Easton Easton Diversion Dam.jpg
Unnamed Diversion Dam 0  Washington 47°03′50″N 120°39′09″W / 47.06389°N 120.65250°W / 47.06389; -120.65250 USBR
Roza Diversion Dam 67 ft (20 m)[88] 12  Washington 46°44′56″N 120°27′56″W / 46.74889°N 120.46556°W / 46.74889; -120.46556 1939[89] USBR Roza Dam.jpg
Wapato Dam 19 ft (5.8 m)[90] 0  Washington 46°31′27″N 120°28′37″W / 46.52417°N 120.47694°W / 46.52417; -120.47694 Wapato Reservoir Wapato Dam.jpg
Sunnyside Dam 8 ft (2.4 m)[84] 0[85]  Washington 46°29′52″N 120°26′41″W / 46.49778°N 120.44472°W / 46.49778; -120.44472 1907[91] Sunnyside Valley Irrigation District Sunnyside Dam.jpg
Prosser Dam 9 ft (2.7 m)[92] 0  Washington 46°12′45″N 119°46′22″W / 46.21250°N 119.77278°W / 46.21250; -119.77278 1904[92] USBR Prosser Dam.jpg
Wannawish Dam 6.6 ft (2.0 m)[93] 0  Washington 46°22′43″N 119°25′02″W / 46.37861°N 119.41722°W / 46.37861; -119.41722 1892[93] Wannawish Dam.jpg

Willamette River Dam[edit]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Willamette Falls Dam 20 ft (6.1 m)[94] 15.18[95]  Oregon 45°21′11″N 122°37′04″W / 45.35306°N 122.61778°W / 45.35306; -122.61778 1888[15] Portland General Electric USACE Willamette Falls Oregon.jpg

Santiam River Dams[edit]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Big Cliff Dam (North Santiam)  Oregon 44°45′03″N 122°16′59″W / 44.75083°N 122.28306°W / 44.75083; -122.28306 1953 Army Corps of Engineers Big Cliff Reservoir (reregulation for Detroit Reservoir)
Detroit Dam  Oregon 44°43′18″N 122°15′01″W / 44.72167°N 122.25028°W / 44.72167; -122.25028 1953 Army Corps of Engineers Detoit Reservoir
Foster Dam (South Santiam)  Oregon 44°24′55″N 122°40′13″W / 44.41528°N 122.67028°W / 44.41528; -122.67028 1968 Army Corps of Engineers Foster Reservoir (reregulation for Green Peter Reservoir)
Green Peter Dam  Oregon 44°27′00″N 122°32′57″W / 44.45000°N 122.54917°W / 44.45000; -122.54917 1968 Army Corps of Engineers Green Peter Reservoir

Middle Fork Willamette River Dams[edit]

Note: Dams are listed in order from headwater to mouth

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Hills Creek Dam 304 ft (93 m)[96] 30[96]  Oregon 43°42′33″N 122°25′26″W / 43.70917°N 122.42389°W / 43.70917; -122.42389 1961[96] USACE Hills Creek Reservoir Hills Creek Reservoir aerial.jpg
Lookout Point Dam 276 ft (84 m)[97] 150[97]  Oregon 43°54′48″N 122°45′09″W / 43.91333°N 122.75250°W / 43.91333; -122.75250 1954[97] USACE Lookout Point Lake Lookout Point Dam.jpg
Fall Creek Dam  Oregon 43°54′49″N 122°45′25″W / 43.91361°N 122.75694°W / 43.91361; -122.75694 1966 Army Corps of Engineers Fall Creek Reservoir
Dexter Dam 93 ft (28 m)[97] 15[97]  Oregon 43°55′22″N 122°48′23″W / 43.92278°N 122.80639°W / 43.92278; -122.80639 1954[97] USACE Dexter Reservoir USACE Dexter Lake and Dam.jpg

McKenzie River Dams[edit]

Note: Dams are listed in order from headwater (Clear Lake) to mouth (Willamette River)).

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Carmen Diversion Dam  Oregon 44°20′19″N 122°00′11″W / 44.33861°N 122.00306°W / 44.33861; -122.00306 Eugene Water & Electric Board Carmen Reservoir
Trail Bridge Dam 10[98]  Oregon 44°16′24″N 122°03′02″W / 44.27333°N 122.05056°W / 44.27333; -122.05056 Eugene Water & Electric Board Trail Bridge Reservoir
Cougar Dam  Oregon 44°07′44″N 122°14′30″W / 44.12889°N 122.24167°W / 44.12889; -122.24167 1963 Army Corps of Engineers Cougar Reservoir
Blue River Dam  Oregon 44°10′23″N 122°19′47″W / 44.17306°N 122.32972°W / 44.17306; -122.32972 1969 Army Corps of Engineers Blue River Reservoir
Leaburg Dam 25[99]  Oregon 44°08′15″N 122°36′43″W / 44.13750°N 122.61194°W / 44.13750; -122.61194 1929[99] Eugene Water & Electric Board Leaburg Reservoir Leaburg Dam (Lane County, Oregon scenic images) (lanDA0035).jpg

Coast Fork Willamette River Dam[edit]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Cottage Grove Dam 95 ft (29 m)[100] 0  Oregon 43°42′58″N 123°03′03″W / 43.71611°N 123.05083°W / 43.71611; -123.05083 1942[100] USACE Cottage Grove Lake Cottage Grove Dam.jpg

Spokane River Dams[edit]

Note: Dams are listed in order from headwater (Lake Coeur d'Alene) to mouth (Columbia River, WA).

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Post Falls Hydroelectric Development 64 ft (20 m)[101] 15[101]  Idaho 47°42′31″N 116°57′13″W / 47.70861°N 116.95361°W / 47.70861; -116.95361 1908[101] Avista Raised Lake Coeur d'Alene
Upriver Dam 17.7[102]  Washington 47°41′09″N 117°19′43″W / 47.68583°N 117.32861°W / 47.68583; -117.32861 1894 / 1933[n 23] City of Spokane Upriver Dam Reservoir
Upper Falls Dam 35 ft (11 m)[103] 10[103]  Washington 47°39′46″N 117°24′55″W / 47.66278°N 117.41528°W / 47.66278; -117.41528 1922[103] Avista Upper Falls Reservoir
Monroe Street Dam 24 ft (7.3 m)[104] 15[104]  Washington 47°39′42″N 117°25′31″W / 47.66167°N 117.42528°W / 47.66167; -117.42528 1890[104] Avista Monroe Street Dam on Spokane River.jpg
Nine Mile Dam 58 ft (18 m)[105] 26[105]  Washington 47°46′30″N 117°32′38″W / 47.77500°N 117.54389°W / 47.77500; -117.54389 1908[105] Avista Nine Mile Reservoir VIEW OF SPILLWAY DAM AND POWERHOUSE FOREGROUND, SHOWING NINE MILE RESERVOIR IN LEFT BACKGROUND, LOOKING WEST - Nine Mile Hydroelectric Development, Dam, State Highway 291 HAER WASH,32-NIMIFA.V,1A-3.tif
Long Lake Dam 213 ft (65 m)[106] 71[106]  Washington 47°50′14″N 117°50′23″W / 47.83722°N 117.83972°W / 47.83722; -117.83972 1915[106] Avista Long Lake Long Lake Dam.jpg
Little Falls Dam 57 ft (17 m)[107] 36[108]  Washington 47°49′57″N 117°55′04″W / 47.83250°N 117.91778°W / 47.83250; -117.91778 1911[109] Avista Little Falls Pool

Cowlitz River Dams[edit]

Note: Dams are listed in order from headwater (Cascade Mountains) to mouth (Columbia River, WA)

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Cowlitz Falls Dam 140 ft (43 m)[110] 70[111]  Washington 46°27′59″N 122°06′33″W / 46.46639°N 122.10917°W / 46.46639; -122.10917 1994[111] Bonneville Power Administration Lake Scanewa
Mossyrock Dam 606 ft (185 m)[112] 300[112]  Washington 46°32′04″N 122°25′29″W / 46.53444°N 122.42472°W / 46.53444; -122.42472 1968[112] Tacoma Public Utilities Riffe Lake Mossyrock Dam.JPG
Mayfield Dam 250 ft (76 m)[113] 162[113]  Washington 46°30′10″N 122°35′18″W / 46.50278°N 122.58833°W / 46.50278; -122.58833 1963[113] Tacoma Public Utilities Lake Mayfield

Chelan River Dam[edit]

Name Height Capacity (MW) Province/State(s) Coordinates Year of Completion Owner Reservoir Formed Dam Picture
Lake Chelan Dam 40 ft (12 m)[114] 59.2[114]  Washington 47°50′04″N 120°00′45″W / 47.83444°N 120.01250°W / 47.83444; -120.01250 1892-1903 / 1927[n 24] Chelan County Public Utility District Raised Lake Chelan HD.11C.081 (14926342072).jpg

See also[edit]

Notes[edit]

  1. ^ Dam was initially completed in 1941; third power plant was begun in 1967 and completed in 1974.[9]
  2. ^ The original dam was completed in 1911. In 1917, the dam was raised 17.5 feet to increase storage. Later, safety concerns were addressed and the new, modified dam was completed in 1989.[25]
  3. ^ Original dam was completed in 1927. Due to deterioration, a replacement dam was commissioned and completed in 1978.[29]
  4. ^ Information received in email exchange with representative from Idaho Power.
  5. ^ Initially completed in 1935, updated in 1995 with diversion structure and two powerhouses[33]
  6. ^ Information received in email exchange with representative from Idaho Power.
  7. ^ Information received in email exchange with representative from Idaho Power.
  8. ^ Constructed with two power plants - A & B. Upper Salmon A was completed in 1937, Upper Salmon B, located a mile upriver from A, was completed in 1947.[33]
  9. ^ Information received in email exchange with representative from Idaho Power.
  10. ^ Initially constructed by Greater Shoshone and Twin Falls Water Power Company in 1910, bought by Idaho Power in 1916 and updated in 1949.[33]
  11. ^ A new power plant was built in the 1990s; this one was decommissioned and turned into a historical display[39]
  12. ^ Information received in email exchange with representative from Idaho Power.
  13. ^ Dam and units one to four completed in 1959, unit five completed in 1980.[41]
  14. ^ Dam and first three powerhouses were completed in 1975. Three further powerhouses, as well as modifications to Lewiston's water intake, were completed in 1987.[48]
  15. ^ Dam was initially completed in 1961 with three generators online. Powerhouse units four through six were later added and online in 1976.[53]
  16. ^ The first Wild Horse Dam was constructed in 1937. After the aggregate was found to be of poor quality, a new concrete, thin arch dam was completed in 1969, doubling the size of the reservoir.[56]
  17. ^ Kootenay Canal Generating Station is located at the end of a canal created by the Corra Linn Dam.
  18. ^ Original dam constructed in 1944 created 140 MW; Expansion completed in 2007 added 120 MW.[8]
  19. ^ Original dam constructed in 1944 created 140 MW; Expansion completed in 2007 added 120 MW.[8]
  20. ^ Although these rivers are not one, for the simplification of this list they will be listed together, as they are only separated by Lake Pend Oreille.
  21. ^ All forks of Flathead River are treated as being on main stem, as there is only one dam on any of the forks.
  22. ^ On South Fork of Flathead River
  23. ^ Originally constructed in 1894, upgraded to concrete structure in 1933, with significant upgrades in the 1980s.[102]
  24. ^ Beginning in 1892, dams were constructed at the mouth of Lake Chelan. After two failures, a more robust dam was constructed in 1903, providing electricity to Chelan. The current dam was completed in 1927.[114]

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External links[edit]