Calhoun County Bridge Report Card
Calhoun County scores 54 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Calhoun County, Iowa
Calhoun County has 198 bridges in the National Bridge Inventory, with 49 rated poor and 0 rated scour-critical. Its poor-condition share of 24.7% is above the 18.6% statewide average. Poor-condition bridges carry about 3,576 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Calhoun County a Bridge Condition Exposure Score of 54/100 (F). The county has 198 bridges in the National Bridge Inventory, including 49 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 3,576 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 | 24.7% | 40.0 |
| Poor-condition traffic exposure | 25 | 5.2% of measured traffic | 3.9 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 54 years vs 48 nationally | 2.3 |
| Traffic-data completeness | 5 | 69,366 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 | 24.7% |
| State Poor-Condition Share | 18.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 54 years |
| Poor-Condition Traffic Exposure | 3,576 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Calhoun County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| FM over Lake Cr. | Poor condition + traffic exposure | Poor | 359 | 1978 |
| Co RD N-37 over Lake Creek | Poor condition + traffic exposure | Poor | 354 | 1985 |
| FM over Dd 261 | Poor condition + traffic exposure | Poor | 300 | 1963 |
| FM over Dd 9-13 | Poor condition + traffic exposure | Poor | 290 | 1966 |
| Local over Camp Ck | Poor condition + traffic exposure | Poor | 279 | 1973 |
| Co RD over East Cedar Creek | Poor condition + traffic exposure | Poor | 220 | 1968 |
| FM over Dd 181 Big Cedar | Poor condition + traffic exposure | Poor | 219 | 1938 |
| FM over E Cedar Creek | Poor condition + traffic exposure | Poor | 180 | 1970 |
| FM over Cedar Creek | Poor condition + traffic exposure | Poor | 150 | 1971 |
| FM over Cain Creek | Poor condition + traffic exposure | Poor | 110 | 1968 |
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.