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 1–25 of 97
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Winchester Lewis County | 40 | 1910 | High | Fair |
| Weston Oneida County | 42 | 1929 | High | Fair |
| Twin Lakes South Franklin County | 36 | 1920 | High | Satisfactory |
| Twin Lakes North Franklin County | 32 | 1920 | High | Fair |
| Trail Creek Dam Blaine County | 23 | 1937 | High | Fair |
| Thompson Mtis Custer County | 789 | 1982 | High | Fair |
| Texas Basin Owyhee County | 121 | 1979 | High | Fair |
| Swan Falls Ada County | 88 | 1901 | High | Satisfactory |
| Sublett Cassia County | 48 | 1914 | High | Fair |
| Strong Arm No 1 (Upper) Franklin County | 39 | 1887 | High | Fair |
| Star No 6 Shoshone County | 33 | 1979 | High | Fair |
| Squaw Creek Owyhee County | 61 | 1968 | High | Fair |
| Spring Valley Latah County | 47 | 1962 | High | Fair |
| Soldiers Meadow Dam Nez Perce County | 69 | 1922 | High | Not Available |
| Soda Creek Main Dam Caribou County | 36 | 1967 | High | Fair |
| Soda Caribou County | 103 | 1925 | High | Fair |
| Simplot Effluent Irrigation Lagoon Bannock County | 39 | 1981 | High | Fair |
| Salmon Falls Twin Falls County | 224 | 1911 | High | Fair |
| Saint John Oneida County | 43 | 1918 | High | Unsatisfactory |
| Ririe Dam Bonneville County | 253 | 1977 | High | Not Available |
| Reservoir A Dam Nez Perce County | 61 | 1907 | High | Not Available |
| Post Falls South Channel Kootenai County | 25 | 1906 | High | Satisfactory |
| Post Falls North Channel Kootenai County | 31 | 1906 | High | Fair |
| Post Falls Earth Dike Kootenai County | 16 | 1990 | High | Satisfactory |
| Portneuf Caribou County | 55 | 1912 | High | 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.