Hydroelectric Dams in Washington

Washington has 50 hydroelectric dams, of which 35 carry a high hazard classification. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Mossyrock	Lewis	606	High	Unsatisfactory	1968
2	Ross	Whatcom	540	High	Satisfactory	1949
3	Swift No. 1	Skamania	412	High	Fair	1958
4	Diablo	Whatcom	389	High	Satisfactory	1929
5	Boundary	Pend Oreille	360	High	Fair	1967
6	Alder	Pierce	330	High	Satisfactory	1945
7	Yale	Cowlitz	323	High	Fair	1953
8	Merwin	Cowlitz	313	High	Fair	1931
9	Gorge	Whatcom	300	High	Satisfactory	1961
10	Lower Baker	Skagit	285	High	Poor	1927
11	Cushman No 2	Mason	275	High	Satisfactory	1930
12	Cushman No 1	Mason	272	High	Fair	1926
13	Culmback	Snohomish	262	High	Satisfactory	1983
14	Mayfield	Lewis	250	High	Unsatisfactory	1963
15	Chief Joseph Dam	Douglas	230	High	Not Available	1955
16	Masonry Dam	King	230	High	Satisfactory	1914
17	Long Lake	Stevens	225	High	Fair	1915
18	La Grande	Thurston	217	High	Satisfactory	1944
19	Wanapum	Kittitas	206	High	Fair	1965
20	Priest Rapids	Grant	187	High	Fair	1961
21	Wells	Chelan	160	High	Poor	1968
22	Skookumchuck	Thurston	160	High	Satisfactory	1970
23	Cowlitz Falls	Lewis	145	Significant	Satisfactory	1994
24	Rocky Reach	Chelan	130	High	Satisfactory	1962
25	Swift No 2 Hydroelectric Project	Cowlitz	121	Low	Satisfactory	1959
26	Nine Mile	Spokane	87	High	Satisfactory	1908
27	Little Falls Spillway Dam	Lincoln	72	Low	Fair	1910
28	Rock Island	Douglas	71	High	Satisfactory	1932
29	Roza Diversion Dam	Kittitas	67	Low	Not Available	1939
30	Chelan	Chelan	66	Significant	Fair	1927
31	Little Falls Dam	Stevens	64	High	Fair	1910
32	Power Lake Dam	Pend Oreille	60	High	Fair	1922
33	Spencer Lake	San Juan	42	Low	Satisfactory	1983
34	Yale Saddle Dam	Cowlitz	40	High	Unsatisfactory	1953
35	Upriver Dam	Spokane	38	High	Poor	1937
36	Fish Barrier Dam	Skagit	36	Low	Satisfactory	1959
37	Yelm Canal Dike	Thurston	35	High	Unsatisfactory	1930
38	Sullivan Lake	Pend Oreille	34	High	Fair	1923
39	Upper Baker -auxiliary Dike	Whatcom	30	High	Satisfactory
40	Calispell Creek Dike And Pump Plant	Pend Oreille	28	High	Poor
41	Swofford Pond	Lewis	26	Low	Satisfactory
42	Meyers Falls	Stevens	26	Low	Satisfactory	1961
43	Pumping Pond Dike	Whatcom	22	Low	Satisfactory	1960
44	Cascade Lake Dam	San Juan	21	High	Poor	1915
45	Upper Falls Intake Dam	Spokane	20	Low	Satisfactory	1922
46	Snoqualmie Falls	King	19	Low	Satisfactory	1898
47	Barrier Dam	Lewis	16	Low	Satisfactory	1968
48	Mayfield Plunge Pool Barrier	Lewis	14	Low	Satisfactory	1963
49	Packwood Lake	Lewis	14	High	Satisfactory	1964
50	Moran Slough Dike	Grant	13	Low	Satisfactory	1964

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