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 701–725 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Desert Valley County | 20 | 1956 | Low | Not Rated |
| Detergent Lewis and Clark County | 15 | 1956 | Low | Not Rated |
| Deus Nachina Chouteau County | 20 | 1950 | Low | Not Rated |
| Deuteronomy Chouteau County | 15 | 1972 | Low | Not Rated |
| Deveny Coulee Dam Treasure County | 25 | 1950 | Low | Not Rated |
| D'Ewart Park County | 10 | 1951 | Low | Not Rated |
| Dewey Sheridan County | 25 | 1948 | Low | Not Rated |
| Dewry Fergus County | 15 | 1960 | Low | Not Rated |
| D G Orchowski #1 Big Horn County | 30 | 1963 | Low | Not Rated |
| D G Orchowski #2 Big Horn County | 30 | 1958 | Low | Not Rated |
| D Hannaland #1 McCone County | 20 | 1959 | Low | Not Rated |
| Diamond #1 Custer County | 15 | 1958 | Low | Not Rated |
| Dick Golie Wildlife Dam Cascade County | 30 | 1965 | Low | Not Rated |
| Dies Irae Chouteau County | 25 | 1961 | Low | Not Rated |
| Dietz Storage #13 Big Horn County | 17 | 2006 | Low | Not Rated |
| Dietz Storage #8 Big Horn County | 25 | 2007 | Low | Not Rated |
| Ding-A-Ling Dawson County | 15 | 1955 | Low | Not Rated |
| Ding Dong Carter County | 30 | 1955 | Significant | Not Available |
| Diogenes Chouteau County | 25 | 1960 | Low | Not Rated |
| Diomedes Chouteau County | 20 | 1947 | Low | Not Rated |
| Dionysia Chouteau County | 20 | 1945 | Low | Not Rated |
| Dioscuri Chouteau County | 15 | 1955 | Low | Not Rated |
| Dirty Wash Reservoir Garfield County | 24 | 1950 | Low | Not Rated |
| Disco Creek Garfield County | 12 | 1960 | Low | Not Rated |
| Dishwater Blaine County | 20 | 1950 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.