Dam Safety by State
The United States has over 91,678 dams tracked in the National Inventory of Dams, with 16,265 classified as high hazard — meaning failure would probably cause loss of human life. Dam safety regulations, inspection requirements, and oversight vary significantly from state to state.
The table below shows dam counts, hazard classifications, and condition data for each state. Click any state to see county-level breakdowns, individual dam records, and detailed safety information.
| State | Total | High Hazard | Significant | Poor/Unsat. | Avg Age |
|---|---|---|---|---|---|
| Alabama | 2,252 | 216 | 443 | 6 | 59 yrs |
| Alaska | 105 | 29 | 41 | 11 | 56 yrs |
| Arizona | 375 | 159 | 38 | 44 | 71 yrs |
| Arkansas | 1,257 | 190 | 231 | 69 | 62 yrs |
| California | 1,436 | 807 | 162 | 70 | 76 yrs |
| Colorado | 1,958 | 451 | 294 | 119 | 84 yrs |
| Connecticut | 1,225 | 233 | 937 | 126 | 114 yrs |
| Delaware | 83 | 57 | 9 | 4 | 88 yrs |
| Florida | 1,074 | 99 | 335 | 21 | 56 yrs |
| Georgia | 5,361 | 521 | 11 | 230 | 62 yrs |
| Guam | 1 | 1 | 0 | 0 | 76 yrs |
| Hawaii | 124 | 117 | 2 | 95 | 92 yrs |
| Idaho | 394 | 96 | 141 | 41 | 76 yrs |
| Illinois | 1,630 | 250 | 361 | 6 | 60 yrs |
| Indiana | 1,084 | 276 | 319 | 517 | 65 yrs |
| Iowa | 4,124 | 91 | 274 | 25 | 45 yrs |
| Kansas | 6,471 | 323 | 176 | 120 | 56 yrs |
| Kentucky | 1,065 | 269 | 148 | 279 | 60 yrs |
| Louisiana | 748 | 42 | 72 | 109 | 54 yrs |
| Maine | 582 | 75 | 77 | 81 | 111 yrs |
| Maryland | 425 | 107 | 136 | 92 | 60 yrs |
| Massachusetts | 1,291 | 318 | 616 | 336 | 112 yrs |
| Michigan | 1,019 | 146 | 149 | 94 | 81 yrs |
| Minnesota | 1,122 | 44 | 123 | 80 | 60 yrs |
| Mississippi | 6,089 | 348 | 67 | 273 | 48 yrs |
| Missouri | 5,380 | 1475 | 184 | 49 | 50 yrs |
| Montana | 2,986 | 190 | 192 | 132 | 74 yrs |
| Nebraska | 2,954 | 155 | 215 | 812 | 51 yrs |
| Nevada | 507 | 160 | 84 | 150 | 44 yrs |
| New Hampshire | 664 | 162 | 185 | 152 | 99 yrs |
| New Jersey | 830 | 232 | 332 | 233 | 95 yrs |
| New Mexico | 411 | 219 | 53 | 210 | 65 yrs |
| New York | 1,894 | 431 | 556 | 355 | 89 yrs |
| North Carolina | 3,622 | 1637 | 648 | 379 | 65 yrs |
| North Dakota | 948 | 54 | 63 | 35 | 58 yrs |
| Ohio | 1,377 | 397 | 564 | 509 | 64 yrs |
| Oklahoma | 4,981 | 420 | 207 | 59 | 60 yrs |
| Oregon | 857 | 149 | 169 | 46 | 67 yrs |
| Pennsylvania | 1,480 | 780 | 308 | 215 | 80 yrs |
| Puerto Rico | 36 | 36 | 0 | 12 | 73 yrs |
| Rhode Island | 234 | 95 | 81 | 126 | 127 yrs |
| South Carolina | 2,400 | 644 | 240 | 1120 | 68 yrs |
| South Dakota | 2,541 | 85 | 149 | 34 | 67 yrs |
| Tennessee | 1,203 | 250 | 347 | 14 | 56 yrs |
| Texas | 7,398 | 1603 | 558 | 257 | 61 yrs |
| Utah | 858 | 269 | 322 | 15 | 65 yrs |
| Vermont | 362 | 67 | 131 | 104 | 90 yrs |
| Virginia | 2,702 | 433 | 183 | 124 | 76 yrs |
| Washington | 817 | 405 | 98 | 68 | 55 yrs |
| West Virginia | 490 | 375 | 70 | 57 | 60 yrs |
| Wisconsin | 961 | 178 | 84 | 63 | 89 yrs |
| Wyoming | 1,490 | 99 | 104 | 576 | 62 yrs |