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 1101–1125 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lucas #3 Meagher County | 30 | 1941 | Low | Not Rated |
| Lucas #1 Meagher County | 28 | 1939 | Low | Not Rated |
| L Sayer-Magdalena Roosevelt County | 22 | 1959 | Low | Not Rated |
| L Pawlowski #3 McCone County | 20 | 1960 | Low | Not Rated |
| L Pawlowski #1 McCone County | 13 | 1950 | Low | Not Rated |
| Lower Twin Lakes Ravalli County | 20 | 1916 | Low | Not Available |
| Lower Elliot Lake Powell County | 10 | 1924 | Low | Not Available |
| Lower Blacktail Reservoir Rosebud County | 20 | 1955 | Low | Not Rated |
| Lower Prairie County | 29 | 1962 | Low | Not Rated |
| Love Custer County | 31 | 1936 | Low | Not Rated |
| Loubren INCorporated #1 Toole County | 30 | 1940 | Low | Not Rated |
| Lost Leg Rosebud County | 32 | 1968 | Low | Not Rated |
| Lost Calf Detention Dam Carter County | 31 | 1966 | Low | Unsatisfactory |
| Lost Again Blaine County | 25 | 1947 | Low | Not Rated |
| Lori Detention Dam Valley County | 19 | 1964 | Low | Unsatisfactory |
| Looney Tuney Toole County | 20 | 1950 | Low | Not Rated |
| Loomis, D. #2 Garfield County | 30 | 1965 | Low | Not Rated |
| Long Horn #4 Valley County | 16 | 1952 | Low | Not Rated |
| Longhorn #1/Horny Detention Dam Valley County | 21 | 1966 | Low | Fair |
| Long Horn #1 Dam Valley County | 26 | — | Low | Unsatisfactory |
| Long Dam Carter County | 14 | — | Low | Fair |
| Lone Tree Phillips County | 17 | 1946 | Low | Not Rated |
| Lonesome Phillips County | 16 | 1946 | Low | Not Rated |
| L Olson #1 Rosebud County | 12 | 1942 | Low | Not Rated |
| Lois Lake Powell County | 23 | 1966 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.