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 126–150 of 156
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Soulen Family Dam Valley County | 22 | 2009 | Low | Fair |
| South Fork Detention Dam Custer County | 31 | — | Low | Not Rated |
| Spring Creek Camas County | 17 | 1918 | Low | Fair |
| Springfeild Bird Haven Bingham County | 13 | — | Low | Poor |
| Stewart Ranch Caribou County | 15 | 1965 | Low | Fair |
| Strickland Owyhee County | 35 | 1927 | Low | Fair |
| Sulphur Gulch Payette County | 23 | 1976 | Low | Fair |
| Summit Camas County | 13 | 1941 | Low | Fair |
| Summit Custer County | 19 | 1921 | Low | Fair |
| Thorn Creek Dam Gooding County | 22 | — | Low | Not Rated |
| Tindall Owyhee County | 13 | 1951 | Low | Fair |
| Tingey Franklin County | 25 | 1955 | Low | Fair |
| Toponce Ditch Dam Lower Caribou County | 18 | — | Low | Fair |
| Trail Diversion Elmore County | 28 | 1962 | Low | Fair |
| Twin Falls Jerome County | 19 | 1935 | Low | Satisfactory |
| Twin Granite Adams County | 25 | 1920 | Low | Fair |
| Tyson North Owyhee County | 27 | 1967 | Low | Fair |
| Tyson West Owyhee County | 42 | 1967 | Low | Fair |
| Upper Bear Dam Idaho County | 13 | 1910 | Low | Not Rated |
| Upper Diversion Dam #1 Bonneville County | 23 | 1982 | Low | Satisfactory |
| Upper Diversion Dam #2 Bonneville County | 33 | 1982 | Low | Satisfactory |
| Upper Salmon Falls A-Plant Diversion Dam Twin Falls County | 9 | 1937 | Low | Satisfactory |
| Upper Salmon Falls A-Plant & Forebay Twin Falls County | 85 | 1937 | Low | Satisfactory |
| Upper Salmon Falls B-Plant Forebay Twin Falls County | 73 | 1947 | Low | Satisfactory |
| Upper Salmon Falls Dam Gooding County | 32 | 1937 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.