Flood Control Dams in Idaho

Idaho has 19 flood control dams, of which 7 carry a high hazard classification. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Dworshak Dam	Clearwater	717	High	Not assessed	1973
2	Anderson Ranch Dam	Elmore	456	High	Not assessed	1950
3	Arrowrock Dam	Boise	350	High	Not assessed	1915
4	Lucky Peak Dam	Ada	340	High	Not assessed	1955
5	Palisades Dam	Bonneville	270	High	Not assessed	1957
6	Ririe Dam	Bonneville	253	High	Not assessed	1977
7	American Falls Dam	Power	104	High	Not assessed	1927
8	Stewart Gulch Main Fork	Ada	76	Significant	Satisfactory	1998
9	Crane Gulch East Dam	Ada	60	Significant	Satisfactory	1998
10	Bradshaw Detention Dam #4	Custer	49	Low	Not assessed	1967
11	Crane Gulch Main Fork	Ada	46	Significant	Satisfactory	1998
12	Stewart Gulch North Fork	Ada	38	Significant	Satisfactory	1997
13	Bradshaw Detention Dam #3	Custer	33	Low	Not assessed
14	South Fork Detention Dam	Custer	31	Low	Not assessed
15	Horseshoe	Custer	29	Low	Not assessed	1967
16	Cottonwood Creek Middle	Ada	20	Significant	Fair	1961
17	Cottonwood Creek Upper	Ada	18	Significant	Fair	1961
18	Cottonwood Creek Lower	Ada	15	Significant	Fair	1961
19	Twin Lakes	Kootenai	14	Significant	Fair	2005

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