US Dam Infrastructure Statistics
91,646
Total Dams
16,227
High Hazard
11,271
Significant Hazard
65 yrs
Average Age
States Ranked by % High Hazard Dams
| State | Total Dams | High Hazard | Significant | Low | % High | Avg Age |
|---|---|---|---|---|---|---|
| Puerto Rico | 36 | 36 | 0 | 0 | 100.00% | 73.8 yrs |
| Hawaii | 127 | 119 | 2 | 6 | 93.70% | 92.7 yrs |
| West Virginia | 562 | 421 | 77 | 28 | 74.91% | 60.5 yrs |
| Delaware | 83 | 57 | 9 | 17 | 68.67% | 88.9 yrs |
| California | 1,445 | 821 | 170 | 454 | 56.82% | 77.0 yrs |
| New Mexico | 398 | 219 | 45 | 128 | 55.03% | 65.5 yrs |
| Pennsylvania | 1,483 | 780 | 312 | 378 | 52.60% | 80.4 yrs |
| Washington | 814 | 411 | 97 | 303 | 50.49% | 55.0 yrs |
| North Carolina | 3,513 | 1,569 | 575 | 1,369 | 44.66% | 65.6 yrs |
| Arizona | 370 | 157 | 39 | 168 | 42.43% | 70.9 yrs |
| Rhode Island | 234 | 95 | 81 | 58 | 40.60% | 127.7 yrs |
| Nevada | 507 | 160 | 84 | 263 | 31.56% | 44.9 yrs |
| Utah | 860 | 269 | 327 | 264 | 31.28% | 66.1 yrs |
| Ohio | 1,400 | 401 | 565 | 434 | 28.64% | 64.9 yrs |
| New Jersey | 829 | 232 | 331 | 266 | 27.99% | 95.3 yrs |
| Missouri | 5,395 | 1,490 | 184 | 3,721 | 27.62% | 50.6 yrs |
| South Carolina | 2,388 | 640 | 240 | 1,383 | 26.80% | 68.6 yrs |
| Alaska | 107 | 28 | 43 | 36 | 26.17% | 57.5 yrs |
| Indiana | 1,087 | 279 | 320 | 451 | 25.67% | 65.5 yrs |
| Kentucky | 1,067 | 263 | 150 | 654 | 24.65% | 60.5 yrs |
| Massachusetts | 1,276 | 310 | 643 | 323 | 24.29% | 102.5 yrs |
| New Hampshire | 664 | 161 | 186 | 300 | 24.25% | 99.8 yrs |
| Maryland | 419 | 101 | 149 | 169 | 24.11% | 59.6 yrs |
| Idaho | 397 | 95 | 142 | 159 | 23.93% | 75.9 yrs |
| Colorado | 1,960 | 452 | 294 | 1,214 | 23.06% | 84.0 yrs |
| New York | 1,873 | 420 | 545 | 901 | 22.42% | 89.2 yrs |
| Texas | 7,387 | 1,586 | 561 | 5,240 | 21.47% | 61.8 yrs |
| Tennessee | 1,213 | 250 | 355 | 608 | 20.61% | 56.9 yrs |
| Wisconsin | 975 | 188 | 83 | 704 | 19.28% | 89.5 yrs |
| Connecticut | 1,228 | 236 | 939 | 53 | 19.22% | 115.0 yrs |
| Oregon | 862 | 153 | 167 | 542 | 17.75% | 67.5 yrs |
| Vermont | 363 | 61 | 137 | 165 | 16.80% | 90.6 yrs |
| Virginia | 2,703 | 431 | 185 | 312 | 15.95% | 76.7 yrs |
| Illinois | 1,634 | 249 | 357 | 1,017 | 15.24% | 60.9 yrs |
| Arkansas | 1,260 | 186 | 233 | 821 | 14.76% | 62.7 yrs |
| Michigan | 1,023 | 150 | 148 | 716 | 14.66% | 82.0 yrs |
| Maine | 586 | 73 | 83 | 429 | 12.46% | 110.8 yrs |
| Georgia | 5,388 | 524 | 13 | 4,560 | 9.73% | 62.3 yrs |
| Alabama | 2,255 | 217 | 443 | 1,594 | 9.62% | 59.9 yrs |
| Florida | 1,070 | 95 | 335 | 433 | 8.88% | 56.8 yrs |
| Oklahoma | 4,987 | 424 | 208 | 4,301 | 8.50% | 60.9 yrs |
| Wyoming | 1,486 | 103 | 100 | 1,283 | 6.93% | 62.9 yrs |
| Montana | 2,984 | 187 | 195 | 2,602 | 6.27% | 74.1 yrs |
| Louisiana | 704 | 42 | 70 | 581 | 5.97% | 56.8 yrs |
| Mississippi | 6,088 | 346 | 66 | 4,510 | 5.68% | 48.0 yrs |
| North Dakota | 948 | 53 | 64 | 786 | 5.59% | 59.1 yrs |
| Nebraska | 2,954 | 150 | 217 | 2,586 | 5.08% | 51.1 yrs |
| Kansas | 6,485 | 323 | 176 | 5,901 | 4.98% | 56.4 yrs |
| Minnesota | 1,128 | 39 | 125 | 934 | 3.46% | 60.6 yrs |
| South Dakota | 2,595 | 84 | 153 | 2,358 | 3.24% | 67.6 yrs |
| Iowa | 4,046 | 91 | 248 | 3,707 | 2.25% | 46.6 yrs |