🔍

County Dam Report Cards

3,077 countiesDataset date: 2026-05-15

These report cards summarize county-level dam infrastructure records from the National Inventory of Dams. The score emphasizes concentrations of high-hazard dams plus public safety data flags such as poor/unsatisfactory conditions, missing Emergency Action Plan records, and older inspection dates.

Important: this is a data-transparency score, not a dam-failure prediction. Read the methodology.

Highest-Scoring Counties

See the counties with the largest concentration of report-card flags.

Download CSV

Use the county report-card dataset in a spreadsheet.

Press Resources

Get reporter-friendly caveats and story angles.

Top Counties to Review

CountyStateGradeScoreTotal damsHigh hazardPoor/unsat.Missing EAPOlder inspection
Wake CountyNorth CarolinaF1332363210419816
Worcester CountyMassachusettsF110238998112114
Providence CountyRhode IslandF76612356662956
Orangeburg CountySouth CarolinaF601141388890
Aiken CountySouth CarolinaF5891434878120
Greenville CountySouth CarolinaF5121436750120
Doña Ana CountyNew MexicoF4994933442733
Brown CountyIndianaF486993254632
Jefferson CountyMissouriF4841371022472
Spartanburg CountySouth CarolinaF480143376370
Collin CountyTexasF4701608642247
Lexington CountySouth CarolinaF4701194354150
Richland CountySouth CarolinaF4391156439101
Mecklenburg CountyNorth CarolinaF4361568911192
Guilford CountyNorth CarolinaF415181838301
Washington CountyMissouriF408119886546
New Haven CountyConnecticutF405198481835
Fairfield CountyConnecticutF404209442021
Wayne CountyPennsylvaniaF367984922240
Litchfield CountyConnecticutF367202381903
Maui CountyHawaiiF36654514111
Transylvania CountyNorth CarolinaF364795020204
Edgefield CountySouth CarolinaF364109145920
Middlesex CountyMassachusettsF363143423401
Cumberland CountyNorth CarolinaF361915417239