National Dam Safety & Information Index
91,646 dams across 50 states — hazard ratings, inspection records, and safety data
91,646
Total Dams
16,227
High Hazard
11,271
Significant Hazard
65 yrs
Average Age
Browse by State
Alabama
2,255 dams
217 high hazard
Alaska
107 dams
28 high hazard
Arizona
370 dams
157 high hazard
Arkansas
1,260 dams
186 high hazard
California
1,445 dams
821 high hazard
Colorado
1,960 dams
452 high hazard
Connecticut
1,228 dams
236 high hazard
Delaware
83 dams
57 high hazard
District of Columbia
0 dams
Florida
1,070 dams
95 high hazard
Georgia
5,388 dams
524 high hazard
Hawaii
127 dams
119 high hazard
Idaho
397 dams
95 high hazard
Illinois
1,634 dams
249 high hazard
Indiana
1,087 dams
279 high hazard
Iowa
4,046 dams
91 high hazard
Kansas
6,485 dams
323 high hazard
Kentucky
1,067 dams
263 high hazard
Louisiana
704 dams
42 high hazard
Maine
586 dams
73 high hazard
Maryland
419 dams
101 high hazard
Massachusetts
1,276 dams
310 high hazard
Michigan
1,023 dams
150 high hazard
Minnesota
1,128 dams
39 high hazard
Mississippi
6,088 dams
346 high hazard
Missouri
5,395 dams
1490 high hazard
Montana
2,984 dams
187 high hazard
Nebraska
2,954 dams
150 high hazard
Nevada
507 dams
160 high hazard
New Hampshire
664 dams
161 high hazard
New Jersey
829 dams
232 high hazard
New Mexico
398 dams
219 high hazard
New York
1,873 dams
420 high hazard
North Carolina
3,513 dams
1569 high hazard
North Dakota
948 dams
53 high hazard
Ohio
1,400 dams
401 high hazard
Oklahoma
4,987 dams
424 high hazard
Oregon
862 dams
153 high hazard
Pennsylvania
1,483 dams
780 high hazard
Puerto Rico
36 dams
36 high hazard
Rhode Island
234 dams
95 high hazard
South Carolina
2,388 dams
640 high hazard
South Dakota
2,595 dams
84 high hazard
Tennessee
1,213 dams
250 high hazard
Texas
7,387 dams
1586 high hazard
Utah
860 dams
269 high hazard
Vermont
363 dams
61 high hazard
Virginia
2,703 dams
431 high hazard
Washington
814 dams
411 high hazard
West Virginia
562 dams
421 high hazard
Wisconsin
975 dams
188 high hazard
Wyoming
1,486 dams
103 high hazard
Tallest Dams in the US
| Rank | Dam Name | Height | State | Hazard |
|---|---|---|---|---|
| 1 | Thompson Mtis | 789 ft | Idaho | High Hazard |
| 2 | Chess Refuse Disposal Area No. 1 | 780 ft | West Virginia | High Hazard |
| 3 | Delbarton Slurry Impoundment | 760 ft | West Virginia | High Hazard |
| 4 | Hoover | 730 ft | Nevada | High Hazard |
| 5 | Glen Canyon | 710 ft | Arizona | High Hazard |
| 6 | Abner Fork Dam | 700 ft | Kentucky | High Hazard |
| 7 | Sidney Slurry Impoundment | 665 ft | Kentucky | High Hazard |
| 8 | Long Fork Slurry Impoundment | 665 ft | Kentucky | High Hazard |
| 9 | Killarney Slurry Impoundment | 657 ft | West Virginia | High Hazard |
| 10 | New Bullards Bar | 645 ft | California | High Hazard |