Hamilton County Bridge Report Card
Hamilton County scores 57 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Hamilton County, Iowa
Hamilton County has 165 bridges in the National Bridge Inventory, with 32 rated poor and 0 rated scour-critical. Its poor-condition share of 19.4% is above the 18.6% statewide average. Poor-condition bridges carry about 4,028 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Hamilton County a Bridge Condition Exposure Score of 57/100 (F). The county has 165 bridges in the National Bridge Inventory, including 32 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 4,028 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 | 19.4% | 38.8 |
| Poor-condition traffic exposure | 25 | 1.3% of measured traffic | 0.9 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 56 years vs 48 nationally | 3.2 |
| Traffic-data completeness | 5 | 321,819 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 | 19.4% |
| State Poor-Condition Share | 18.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 56 years |
| Poor-Condition Traffic Exposure | 4,028 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Hamilton County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| FM over Skunk River | Poor condition + traffic exposure | Poor | 698 | 1974 |
| Vail AVE over Over Cc Rr | Poor condition + traffic exposure | Poor | 578 | 1932 |
| Park AVE over Lyons Creek | Poor condition + traffic exposure | Poor | 490 | 1947 |
| Fas 3556 over Creek | Poor condition + traffic exposure | Poor | 478 | 1947 |
| FM over Skunk River | Poor condition + traffic exposure | Poor | 459 | 1992 |
| FM over Drainage Ditch | Poor condition + traffic exposure | Poor | 319 | 1960 |
| FM over Creek | Poor condition + traffic exposure | Poor | 240 | 1957 |
| Local over Creek | Poor condition + traffic exposure | Poor | 131 | 1918 |
| 280th ST over Boone River | Poor condition + traffic exposure | Poor | 62 | 1902 |
| Local over Boone River | Poor condition + traffic exposure | Poor | 60 | 1954 |
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.