Montana Dams
2,990 dams tracked by the National Inventory of Dams
Total Dams
2,990
High Hazard
188
6.3%
Poor / Unsatisfactory
132
Average Age
74 yrs
Hazard Classification
High188 (6.3%)
Significant193 (6.5%)
Low2,606 (87.2%)
Condition Assessment
Satisfactory113 (3.8%)
Fair44 (1.5%)
Poor / Unsatisfactory132 (4.4%)
Not Rated2,701 (90.3%)
Federal
278
State
151
Local
84
Private
2,466
Tallest Dams
- Yankee Doodle Tailings Dam570 ft
- Hungry Horse Dam564 ft
- Libby Dam422 ft
- Noxon Rapids260 ft
- Fort Peck Dam256 ft
High Hazard Dams
- Yankee Doodle Tailings DamHigh
- Hungry Horse DamHigh
- Libby DamHigh
- Noxon RapidsHigh
- Fort Peck DamHigh
Poor Condition Dams
All Dams in Montana
Showing 2351–2375 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Black Out Sheridan County | 15 | 1940 | Low | Not Rated |
| Black Lake (Lincoln) Lincoln County | 20 | 1935 | Low | Not Rated |
| Blackford #5 Carter County | 12 | 1955 | Low | Not Rated |
| Blackfoot Detention Dam Carter County | 23 | 1959 | Low | Unsatisfactory |
| Black Coulee Reservoir Rosebud County | 20 | 1962 | Low | Not Rated |
| Black Coulee Dam Blaine County | 11 | 1938 | Low | Poor |
| Black Cat Hill County | 20 | 1944 | Low | Not Rated |
| Bjarne #2 Daniels County | 27 | 1951 | Low | Not Rated |
| Bjarne #1 Daniels County | 27 | 1951 | Low | Not Rated |
| Bixler #5 Custer County | 31 | 1948 | Low | Not Rated |
| Bixler #2 Custer County | 21 | 1949 | Low | Not Rated |
| Bison Retriever Jefferson County | 15 | 1945 | Low | Not Rated |
| Bison Bone Retention Dam Phillips County | 29 | 1967 | Low | Not Rated |
| Birkrem Garfield County | 18 | 1941 | Low | Not Rated |
| Birkeland Reservoir Chouteau County | 30 | 1950 | Low | Not Rated |
| Binions Reservoir #2 Garfield County | 23 | 1938 | Low | Not Rated |
| Binions #1 Garfield County | 24 | 1937 | Low | Not Rated |
| Binion #4 Garfield County | 25 | 1959 | Low | Not Rated |
| Billing Spring #1 Garfield County | 24 | 1956 | Low | Not Rated |
| Billings #3 Garfield County | 30 | 1938 | Low | Not Rated |
| Billings #2 Garfield County | 21 | 1967 | Low | Not Rated |
| Bill Christensen Dam Sanders County | 17 | 1976 | Low | Not Rated |
| Big (Toole) Toole County | 12 | 1900 | Low | Not Rated |
| Big Timber Sewage Lagoon Sweet Grass County | 15 | 1959 | Low | Not Rated |
| Big Timber Livestock #1 Treasure County | 17 | 1956 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.