Defiance County Bridge Report Card
Defiance County scores 99 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Defiance County, Ohio
Defiance County has 159 bridges in the National Bridge Inventory, with 1 rated poor and 0 rated scour-critical. Its poor-condition share of 0.6% is at or below the 4.7% statewide average. Poor-condition bridges carry about 306 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Defiance County a Bridge Condition Exposure Score of 99/100 (A). The county has 159 bridges in the National Bridge Inventory, including 1 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 306 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 0.6% | 1.3 |
| Poor-condition traffic exposure | 25 | 0.1% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 35 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 320,094 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 0.6% |
| State Poor-Condition Share | 4.7% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 35 years |
| Poor-Condition Traffic Exposure | 306 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Defiance County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Scott RD over Prairie Creek | Poor condition + traffic exposure | Poor | 306 | 1980 |
| Sr15 over Maumee River | High traffic | Good | 27,320 | 2019 |
| SR 15 over Norfolk & Western Rr # | High traffic | Good | 24,257 | 1977 |
| SR 66 over Usr 24 # | High traffic | Good | 16,125 | 2010 |
| SR 15 over Auglaize River | High traffic | Fair | 13,870 | 1991 |
| SR 15 over Usr 24 | High traffic | Good | 10,150 | 2007 |
| SR 66 S Jefferson over Auglaize River | High traffic | Fair | 9,940 | 1966 |
| SR 281 over Usr 24 | High traffic | Good | 9,890 | 2007 |
| SR 15 over Tiffin River | High traffic | Good | 9,291 | 1965 |
| Usr 24 over Maumee River | High traffic | Good | 8,248 | 2007 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.