Idaho Dams
395 dams tracked by the National Inventory of Dams
Total Dams
395
High Hazard
97
24.6%
Poor / Unsatisfactory
42
Average Age
76 yrs
Hazard Classification
High97 (24.6%)
Significant141 (35.7%)
Low156 (39.5%)
Condition Assessment
Satisfactory76 (19.2%)
Fair248 (62.8%)
Poor / Unsatisfactory42 (10.6%)
Not Rated29 (7.3%)
Federal
33
State
14
Local
18
Private
325
Tallest Dams
- Thompson Mtis789 ft
- Dworshak Dam717 ft
- Anderson Ranch Dam456 ft
- Arrowrock Dam350 ft
- Lucky Peak Dam340 ft
High Hazard Dams
- Thompson MtisHigh
- Dworshak DamHigh
- Anderson Ranch DamHigh
- Arrowrock DamHigh
- Lucky Peak DamHigh
Poor Condition Dams
- Magic DamUnsatisfactory
- Fish CreekPoor
- OrchardPoor
- Saint JohnUnsatisfactory
- Louisa CreekPoor
All Dams in Idaho
Showing 226–248 of 248
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Toponce Ditch Dam Lower Caribou County | 18 | — | Low | Fair |
| Trail Elmore County | 30 | 1960 | Significant | Fair |
| Trail Creek Dam Blaine County | 23 | 1937 | High | Fair |
| Trail Diversion Elmore County | 28 | 1962 | Low | Fair |
| Twenty Four Mile Caribou County | 27 | 1928 | Significant | Fair |
| Twin Granite Adams County | 25 | 1920 | Low | Fair |
| Twin Lakes Kootenai County | 14 | 2005 | Significant | Fair |
| Twin Lakes North Franklin County | 32 | 1920 | High | Fair |
| Tyson North Owyhee County | 27 | 1967 | Low | Fair |
| Tyson West Owyhee County | 42 | 1967 | Low | Fair |
| Upper Salmon Falls Dam Gooding County | 32 | 1937 | Low | Fair |
| Van Orden Franklin County | 23 | 1961 | Low | Fair |
| Walker Elmore County | 14 | 1954 | Significant | Fair |
| Walker Dike Elmore County | 7 | 1954 | Low | Fair |
| Warren Diversion Valley County | 19 | 1924 | Significant | Fair |
| Webster Madison County | 22 | 1976 | Low | Fair |
| Weston Oneida County | 42 | 1929 | High | Fair |
| Williams Twin Falls County | 53 | 1952 | Significant | Fair |
| Wilson Lake Jerome County | 31 | 1909 | Significant | Fair |
| Winchester Lewis County | 40 | 1910 | High | Fair |
| Winder Franklin County | 57 | 1958 | Significant | Fair |
| Wiregrass Bannock County | 17 | 1943 | Low | Fair |
| Yanke Valley County | 29 | 1988 | Low | Fair |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.