Montana Dam Report Cards by County
County-level report cards for Montana. Scores combine high-hazard dam counts with condition, emergency-plan, and older-inspection-date flags.
| County | State | Grade | Score | Total | High | Significant | Poor/unsat. | Missing EAP | Older inspection |
|---|---|---|---|---|---|---|---|---|---|
| Valley County | Montana | F | 225 | 144 | 0 | 5 | 44 | 0 | 0 |
| Beaverhead County | Montana | C | 91 | 44 | 7 | 5 | 9 | 4 | 2 |
| Madison County | Montana | C | 81 | 29 | 11 | 6 | 4 | 3 | 5 |
| Lake County | Montana | C | 68 | 18 | 9 | 1 | 6 | 0 | 5 |
| Ravalli County | Montana | C | 60 | 21 | 9 | 1 | 2 | 3 | 5 |
| Phillips County | Montana | C | 59 | 174 | 3 | 7 | 7 | 1 | 2 |
| Lewis and Clark County | Montana | C | 50 | 30 | 11 | 2 | 1 | 0 | 5 |
| Hill County | Montana | B | 48 | 105 | 8 | 7 | 1 | 1 | 4 |
| Flathead County | Montana | B | 47 | 12 | 8 | 1 | 2 | 1 | 4 |
| Meagher County | Montana | B | 47 | 49 | 8 | 7 | 2 | 0 | 3 |
| Missoula County | Montana | B | 47 | 22 | 6 | 9 | 2 | 1 | 3 |
| Blaine County | Montana | B | 43 | 122 | 3 | 9 | 3 | 1 | 3 |
| Wheatland County | Montana | B | 42 | 35 | 8 | 5 | 1 | 0 | 4 |
| Jefferson County | Montana | B | 40 | 11 | 7 | 0 | 1 | 1 | 5 |
| Carter County | Montana | B | 37 | 111 | 0 | 7 | 6 | 0 | 0 |
| Lincoln County | Montana | B | 36 | 19 | 6 | 4 | 2 | 0 | 2 |
| Powell County | Montana | B | 35 | 37 | 8 | 4 | 1 | 0 | 1 |
| Petroleum County | Montana | B | 35 | 55 | 5 | 1 | 3 | 0 | 2 |
| Rosebud County | Montana | B | 35 | 270 | 4 | 5 | 2 | 0 | 4 |
| Sheridan County | Montana | B | 34 | 24 | 1 | 1 | 6 | 0 | 0 |
| Fergus County | Montana | B | 32 | 109 | 4 | 7 | 1 | 0 | 4 |
| Sweet Grass County | Montana | B | 30 | 18 | 4 | 3 | 3 | 0 | 0 |
| Carbon County | Montana | B | 29 | 15 | 4 | 0 | 3 | 0 | 1 |
| Teton County | Montana | B | 28 | 38 | 6 | 3 | 1 | 0 | 1 |
| Park County | Montana | B | 25 | 23 | 3 | 4 | 2 | 0 | 1 |
| Cascade County | Montana | B | 24 | 43 | 5 | 4 | 1 | 0 | 0 |
| Silver Bow County | Montana | B | 20 | 10 | 3 | 2 | 1 | 0 | 2 |
| Pondera County | Montana | A | 19 | 43 | 4 | 7 | 0 | 0 | 0 |
| Dawson County | Montana | A | 19 | 64 | 1 | 1 | 3 | 0 | 0 |
| Deer Lodge County | Montana | A | 17 | 11 | 3 | 3 | 1 | 0 | 0 |
| Gallatin County | Montana | A | 16 | 9 | 4 | 0 | 0 | 0 | 2 |
| Sanders County | Montana | A | 16 | 8 | 3 | 0 | 1 | 0 | 1 |
| Prairie County | Montana | A | 16 | 49 | 0 | 1 | 3 | 0 | 0 |
| Big Horn County | Montana | A | 15 | 72 | 4 | 3 | 0 | 0 | 0 |
| Toole County | Montana | A | 15 | 87 | 2 | 9 | 0 | 0 | 0 |
| Richland County | Montana | A | 14 | 78 | 1 | 11 | 0 | 0 | 0 |
| Custer County | Montana | A | 13 | 176 | 0 | 3 | 2 | 0 | 0 |
| Garfield County | Montana | A | 13 | 244 | 0 | 8 | 1 | 0 | 0 |
| Granite County | Montana | A | 12 | 11 | 2 | 1 | 1 | 0 | 0 |
| Fallon County | Montana | A | 12 | 36 | 2 | 4 | 0 | 0 | 1 |
| Stillwater County | Montana | A | 11 | 10 | 3 | 0 | 0 | 0 | 1 |
| McCone County | Montana | A | 11 | 120 | 1 | 8 | 0 | 0 | 0 |
| Musselshell County | Montana | A | 11 | 30 | 1 | 1 | 1 | 0 | 1 |
| Glacier County | Montana | A | 9 | 17 | 3 | 0 | 0 | 0 | 0 |
| Roosevelt County | Montana | A | 9 | 39 | 0 | 4 | 1 | 0 | 0 |
| Chouteau County | Montana | A | 8 | 103 | 0 | 8 | 0 | 0 | 0 |
| Judith Basin County | Montana | A | 7 | 20 | 2 | 1 | 0 | 0 | 0 |
| Liberty County | Montana | A | 5 | 37 | 1 | 2 | 0 | 0 | 0 |
| Yellowstone County | Montana | A | 5 | 25 | 1 | 2 | 0 | 0 | 0 |
| Wibaux County | Montana | A | 5 | 13 | 0 | 0 | 1 | 0 | 0 |
| Powder River County | Montana | A | 4 | 47 | 0 | 4 | 0 | 0 | 0 |
| Broadwater County | Montana | A | 3 | 5 | 1 | 0 | 0 | 0 | 0 |
| Daniels County | Montana | A | 1 | 20 | 0 | 1 | 0 | 0 | 0 |
| Golden Valley County | Montana | A | 0 | 8 | 0 | 0 | 0 | 0 | 0 |
| Treasure County | Montana | A | 0 | 16 | 0 | 0 | 0 | 0 | 0 |