Tallest Dams in Idaho

Idaho has 394 dams with recorded heights. The tallest is Thompson Mtis at 789 feet. Taller dams impound more water and carry greater potential energy, which is why height is a key factor in hazard classification and inspection requirements.

#	Dam	County	Height (ft)	Type	Purpose	Hazard	Year
1	Thompson Mtis	Custer	789		Tailings	High	1982
2	Dworshak Dam	Clearwater	717	Concrete	Flood Risk Reduction	High	1973
3	Anderson Ranch Dam	Elmore	456	Earth	Flood Risk Reduction	High	1950
4	Arrowrock Dam	Boise	350	Concrete	Flood Risk Reduction	High	1915
5	Lucky Peak Dam	Ada	340	Rockfill	Flood Risk Reduction	High	1955
6	Hells Canyon	Adams	330	Gravity	Hydroelectric	High	1967
7	Palisades Dam	Bonneville	270	Earth	Flood Risk Reduction	High	1957
8	Ririe Dam	Bonneville	253	Rockfill	Flood Risk Reduction	High	1977
9	Salmon Falls	Twin Falls	224		Other	High	1911
10	Oxbow	Adams	209	Rockfill	Hydroelectric	High	1961
11	Black Canyon Diversion Dam	Gem	183	Concrete	Hydroelectric	High	1924
12	Albeni Falls Dam	Bonner	180	Concrete	Hydroelectric	High	1955
13	Cabinet Gorge	Bonner	177	Arch	Hydroelectric	High	1952
14	Deadwood Dam	Valley	165	Concrete	Hydroelectric	High	1931
15	Mann Creek Dam	Washington	148	Earth	Irrigation	High	1967
16	Oakley	Cassia	145		Irrigation	High	1916
17	Bliss	Gooding	140	Concrete	Hydroelectric	High	1950
18	Lucky Friday No 4	Shoshone	132		Tailings	High	2010
19	Little Wood River Dam	Blaine	129	Earth	Irrigation	High	1939
20	Texas Basin	Owyhee	121		Irrigation	High	1979
21	C J Strike	Owyhee	115	Earth	Hydroelectric	High	1952
22	Oneida Main	Franklin	114	Concrete	Irrigation	High	1920
23	Grouse Creek North	Custer	110		Tailings	Significant	1994
24	Lower Salmon	Gooding	110	Concrete	Hydroelectric	High	1949
25	Cascade Dam	Valley	110	Rockfill	Hydroelectric	High	1948
26	Smoky Canyon No 2	Caribou	108		Tailings	Significant	1992
27	American Falls Dam	Power	104	Concrete	Flood Risk Reduction	High	1927
28	Soda	Caribou	103	Concrete	Irrigation	High	1925
29	Lucky Friday No 3	Shoshone	102		Tailings	Significant	1979
30	Hulet	Owyhee	99		Other	High	1976
31	Daniels	Oneida	96		Irrigation	High	1967
32	Fish Creek	Blaine	92		Irrigation	High	1923
33	Moyie	Boundary	92	Gravity	Hydroelectric	High	1949
34	Deep Creek	Oneida	91		Other	High	1952
35	Crowther	Oneida	90		Irrigation	High	1948
36	Cedar Creek	Twin Falls	90		Irrigation	High	1920
37	Swan Falls	Ada	88	Concrete	Hydroelectric	High	1901
38	Minidoka Dam	Minidoka	88	Earth	Fish and Wildlife Pond	High	1906
39	Upper Salmon Falls A-plant & Forebay	Twin Falls	85	Concrete	Hydroelectric	Low	1937
40	Devil Creek	Oneida	84		Irrigation	High	1969
41	Montpelier Creek	Bear Lake	82		Other	High	1971
42	Smoky Canyon No 1	Caribou	80		Tailings	Low	1983
43	Fairchild No. 1 (upper)	Washington	78		Irrigation	High	1975
44	Thompson Srd	Custer	77		Water Supply	Significant	1982
45	Aikman	Gem	77		Irrigation	High	1999
46	Stewart Gulch Main Fork	Ada	76		Flood Risk Reduction	Significant	1998
47	Mackay	Custer	75		Other	High	1918
48	Glendale	Franklin	73		Other	High	1930
49	Upper Salmon Falls B-plant Forebay	Twin Falls	73	Concrete	Hydroelectric	Low	1947
50	Itafos Tailings Pond #4	Caribou	71		Tailings	Significant	1985

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