Largest Reservoirs in Oregon

Oregon has 739 dams with recorded storage capacity. The largest is John Day Lock And Dam with 2,530,000 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	John Day Lock And Dam	Klickitat	2,530,000	230	Navigation	1968
2	Brownlee	Baker	1,470,000	395	Hydroelectric	1958
3	Owyhee Dam	Malheur	1,120,000	417	Irrigation	1932
4	Link River Diversion Dam	Klamath	735,000	22	Hydroelectric	1921
5	Bonneville Locks And Dam	Multnomah	537,000	197	Navigation	1938
6	Round Butte	Jefferson	535,000	440	Hydroelectric	1964
7	Lookout Point Dam	Lane	477,700	276	Flood Risk Reduction	1953
8	Detroit Dam	Linn	455,000	463	Flood Risk Reduction	1953
9	Green Peter Dam	Linn	430,000	378	Flood Risk Reduction	1967
10	Hills Creek Dam	Lane	356,000	341	Flood Risk Reduction	1962
11	The Dalles Lock And Dam	Klickitat	330,000	200	Navigation	1957
12	Arthur R. Bowman Dam	Crook	281,920	245	Flood Risk Reduction	1961
13	Cougar Dam	Lane	220,000	519	Flood Risk Reduction	1963
14	Wickiup South Dike	Deschutes	202,170	29	Fish and Wildlife Pond	1949
15	Warm Springs Dam	Malheur	169,714	106	Irrigation	1919
16	Carty Reservoir	Morrow	150,000	82	Irrigation	1976
17	Dorena Dam	Lane	131,000	154	Flood Risk Reduction	1949
18	Fall Creek Dam	Lane	125,000	205	Flood Risk Reduction	1965
19	Crescent Lake	Klamath	119,600	41	Irrigation	1956
20	Galesville	Douglas	117,000	167	Irrigation	1985
21	Mason Dam	Baker	95,500	173	Flood Risk Reduction	1968
22	Gerber Dam	Klamath	92,215	88	Irrigation	1925
23	Applegate Dam	Jackson	89,300	242	Flood Risk Reduction	1980
24	Blue River Dam	Lane	89,000	270	Flood Risk Reduction	1968
25	Howard Prairie Dam	Jackson	76,700	100	Hydroelectric	1958
26	Mckay Dam	Umatilla	71,534	165	Flood Risk Reduction	1927
27	Timothy Lake	Clackamas	69,000	100	Hydroelectric	1956
28	Crane Prairie Dam	Deschutes	68,800	36	Irrigation	1940
29	Ochoco Dam	Crook	65,664	146	Fish and Wildlife Pond	1920
30	Drews	Lake	65,000	63	Irrigation	1914
31	Foster Dam	Linn	61,000	126	Flood Risk Reduction	1967
32	Scoggins Dam	Washington	60,000	151	Irrigation	1975
33	Agency Valley Dam	Malheur	59,212	110	Flood Risk Reduction	1934
34	Fern Ridge Dam - Dike 2	Lane	56,647	14		1941
35	Cottage Grove Dam	Lane	50,000	103	Flood Risk Reduction	1942
36	Wallowa Lake	Wallowa	49,257	40	Irrigation	1931
37	Willow Creek 3 (malheur)	Malheur	49,000	110	Irrigation	1944
38	Emigrant Spillway Dike	Jackson	46,700	14	Flood Risk Reduction	1960
39	Cold Springs Dam	Umatilla	38,000	115	Irrigation	1908
40	Development No. 1 Dam	Multnomah	33,760	200	Water Supply	1929
41	Pelton	Jefferson	31,800	204	Hydroelectric	1957
42	Bully Creek Dam	Malheur	31,600	121	Flood Risk Reduction	1963
43	Thompson Valley Reservoir	Lake	30,500	48	Irrigation	1922
44	Dexter Dam	Lane	29,900	117	Flood Risk Reduction	1955
45	Unity Dam	Baker	25,500	82	Irrigation	1938
46	Hyatt Dam	Jackson	25,100	53	Hydroelectric	1923
47	Spillway Dam	Clackamas	25,000	180	Water Supply	1962
48	Greaser Lake Reservoir	Lake	20,000	10	Irrigation	1963
49	Barney	Washington	20,000	165	Water Supply	1998
50	Lemolo No 1	Douglas	19,000	120	Hydroelectric	1955

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