Find Dams Near You
Search 91,678 dams across the United States. See hazard classifications, condition assessments, heights, storage capacity, and inspection history.
91,678Total Dams
16,265High Hazard
11,289Significant Hazard
What Is Dam Hazard Classification?
Every dam in the National Inventory of Dams (NID) receives a hazard potential classification based on the consequences of failure — not the likelihood of failure. A "High" hazard dam is one where failure would probably cause loss of human life. "Significant" means failure would cause significant economic loss but no expected loss of life. "Low" means failure would cause minimal damage.
This classification determines inspection frequency, emergency action plan requirements, and regulatory oversight. High hazard dams require the most frequent inspections and must have emergency action plans.
Understanding Condition Assessments
Dam condition assessments rate the physical state of the dam itself:
- Satisfactory — No existing or potential dam safety deficiencies
- Fair — No existing dam safety deficiencies, but potential deficiencies exist that require further analysis
- Poor — A dam safety deficiency is recognized, but has been remediated with temporary risk reduction measures
- Unsatisfactory — A dam safety deficiency is recognized that requires immediate attention
Dam Safety by State
Dam safety regulations vary by state. Use the links below to explore dams in your state, including hazard ratings, condition assessments, and inspection data.
2,856 dams1062 high hazardAlabama2,252 dams216 high hazardAlaska105 dams29 high hazardArizona375 dams159 high hazardArkansas1,257 dams190 high hazardCalifornia400 dams210 high hazardColorado1,958 dams451 high hazardConnecticut1,225 dams233 high hazardDelaware83 dams57 high hazardFlorida1,074 dams99 high hazardGeorgia5,361 dams521 high hazardGuam1 dams1 high hazardHawaii4 dams3 high hazardIdaho394 dams96 high hazardIllinois1,630 dams250 high hazardIndiana1,084 dams276 high hazardIowa4,124 dams91 high hazardKansas6,471 dams323 high hazardKentucky1,065 dams269 high hazardLouisiana748 dams42 high hazardMaine580 dams75 high hazardMaryland425 dams107 high hazardMassachusetts1,291 dams318 high hazardMichigan1,019 dams146 high hazardMinnesota1,122 dams44 high hazardMississippi6,089 dams348 high hazardMissouri5,380 dams1475 high hazardMontana2,986 dams190 high hazardNebraska2,954 dams155 high hazardNevada507 dams160 high hazardNew Hampshire664 dams162 high hazardNew Jersey829 dams232 high hazardNew Mexico411 dams219 high hazardNew York198 dams80 high hazardNorth Carolina3,622 dams1637 high hazardNorth Dakota948 dams54 high hazardOhio1,377 dams397 high hazardOklahoma4,981 dams420 high hazardOregon857 dams149 high hazardPennsylvania1,480 dams780 high hazardPuerto Rico36 dams36 high hazardRhode Island234 dams95 high hazardSouth Carolina2,400 dams644 high hazardSouth Dakota2,541 dams85 high hazardTennessee1,203 dams250 high hazardTexas7,398 dams1603 high hazardUtah858 dams269 high hazardVermont362 dams67 high hazardVirginia2,701 dams433 high hazardWashington817 dams405 high hazardWest Virginia490 dams375 high hazardWisconsin961 dams178 high hazardWyoming1,490 dams99 high hazard