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 476–500 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Shady Lane McCone County | 20 | 1960 | Low | Not Rated |
| Severson #4 Garfield County | 12 | 1969 | Low | Not Rated |
| Severson #3 Custer County | 20 | 1960 | Low | Not Rated |
| Severson #2 Custer County | 21 | 1955 | Low | Not Rated |
| Seven-Up Detention Dam Phillips County | 24 | 1967 | Low | Fair |
| Seven Tree Dam Garfield County | 20 | 1950 | Low | Not Rated |
| Seven #4 Dawson County | 20 | 1937 | Low | Not Rated |
| Setinc #1 Carter County | 16 | 1960 | Low | Not Rated |
| Sentinel Detention Dam Phillips County | 33 | 1969 | Low | Fair |
| Senner Reservoir Dawson County | 20 | 1950 | Low | Not Rated |
| Senner #1 Dawson County | 20 | 1945 | Low | Not Rated |
| Seminary #10 Petroleum County | 18 | 1950 | Low | Not Rated |
| Sediment Control Dam Big Horn County | 30 | — | Low | Not Available |
| Section Four Garfield County | 12 | 1965 | Low | Not Rated |
| Second Telegraph Phillips County | 12 | 1963 | Low | Not Rated |
| Sears Ravalli County | 10 | 1900 | Low | Not Rated |
| Script Detention Dam Valley County | 17 | 1957 | Low | Fair |
| Screwed Up Meagher County | 10 | 1960 | Low | Not Rated |
| Scoup Dam Carter County | 15 | 1966 | Low | Fair |
| Scott Ranch Pondera County | 20 | 1961 | Low | Not Rated |
| Scott #2 Custer County | 23 | 1944 | Low | Not Rated |
| Scobey Sewage Disposal Ponds Daniels County | 8 | 1950 | Low | Not Rated |
| Schwartz Prairie County | 20 | 1950 | Low | Not Rated |
| Schutter Reservoir Gallatin County | 8 | 2006 | Low | Not Rated |
| Schotish Hill County | 15 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.