Clayton County Bridge Report Card
Clayton County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Clayton County, Iowa
Clayton County has 257 bridges in the National Bridge Inventory, with 38 rated poor and 0 rated scour-critical. Its poor-condition share of 14.8% is at or below the 18.6% statewide average. Poor-condition bridges carry about 2,993 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Clayton County a Bridge Condition Exposure Score of 63/100 (D). The county has 257 bridges in the National Bridge Inventory, including 38 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 2,993 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 | 14.8% | 29.6 |
| Poor-condition traffic exposure | 25 | 2.7% of measured traffic | 2.0 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 60 years vs 48 nationally | 4.9 |
| Traffic-data completeness | 5 | 111,097 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 | 14.8% |
| State Poor-Condition Share | 18.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 60 years |
| Poor-Condition Traffic Exposure | 2,993 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Clayton County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Fleetwood RD over Bear CR | Poor condition + traffic exposure | Poor | 589 | 1930 |
| Bridge ST over Honey Creek | Poor condition + traffic exposure | Poor | 589 | 1973 |
| Grandview RD over Volga River | Poor condition + traffic exposure | Poor | 491 | 1960 |
| 6th ST over Drainage | Poor condition + traffic exposure | Poor | 242 | 1920 |
| Mesquite RD over Peck Creek | Poor condition + traffic exposure | Poor | 113 | 1913 |
| Glacier RD over Stream | Poor condition + traffic exposure | Poor | 79 | 1925 |
| Essex AVE over Stream | Poor condition + traffic exposure | Poor | 73 | 1910 |
| Hornet RD over Bear Creek | Poor condition + traffic exposure | Poor | 73 | 1923 |
| Kennedy RD over Stream | Poor condition + traffic exposure | Poor | 62 | 1955 |
| Keystone RD over Stream | Poor condition + traffic exposure | Poor | 62 | 1957 |
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.