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 39
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Teapot Upper Elmore County | 28 | 1977 | Significant | Poor |
| Strong Arm No 2 (Lower) Franklin County | 27 | 1897 | Significant | Poor |
| Springfeild Bird Haven Bingham County | 13 | — | Low | Poor |
| Sirucek Reservoir Jerome County | 17 | 2003 | Low | Poor |
| Shiner Lower Lemhi County | 18 | 1973 | Low | Poor |
| Sheridan Clark County | 22 | 1873 | Significant | Poor |
| Sheep Creek Bear Lake County | 18 | 1951 | Low | Poor |
| Scrappy Creek Owyhee County | 20 | 1927 | Low | Poor |
| Paul Clark County | 28 | 1911 | Low | Poor |
| Orchard Ada County | 43 | 1902 | Significant | Poor |
| Nixon No 2 Boundary County | 13 | — | Low | Poor |
| Mountain View Dam Owyhee County | 25 | 1969 | Significant | Poor |
| Louisa Creek Owyhee County | 41 | 1931 | Low | Poor |
| Lost Valley Adams County | 31 | 1910 | High | Poor |
| Little Payette Lake Dike Valley County | 11 | 1926 | Significant | Poor |
| Little Blue Creek Owyhee County | 37 | 1914 | Significant | Poor |
| Lehman Creek Upper Custer County | 22 | 1925 | Low | Poor |
| Lehman Creek Lower Custer County | 21 | 1999 | Low | Poor |
| Hulet No 2 Dike Owyhee County | 13 | 1987 | Low | Poor |
| Hall Elmore County | 33 | 1945 | Significant | Poor |
| Grasmere North Dam Owyhee County | 22 | 1936 | Significant | Poor |
| Grasmere Middle Dam Owyhee County | 16 | 1936 | Low | Poor |
| Grasmere East Dam Owyhee County | 11 | — | Significant | Poor |
| Gorley Creek Dike Lemhi County | 16 | 1913 | Low | Poor |
| Gorley Creek Lemhi County | 19 | 1913 | Low | Poor |
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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.