Adams County Bridge Report Card
Adams County scores 39 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Adams County, Iowa
Adams County has 185 bridges in the National Bridge Inventory, with 85 rated poor and 6 rated scour-critical. Its poor-condition share of 45.9% is above the 18.6% statewide average. Poor-condition bridges carry about 5,308 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Adams County a Bridge Condition Exposure Score of 39/100 (F). The county has 185 bridges in the National Bridge Inventory, including 85 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 5,308 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 | 45.9% | 40.0 |
| Poor-condition traffic exposure | 25 | 14.2% of measured traffic | 10.6 |
| Scour-critical bridge share | 20 | 3.2% | 6.5 |
| Average age vs national baseline | 10 | 57 years vs 48 nationally | 3.8 |
| Traffic-data completeness | 5 | 37,386 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 | 45.9% |
| State Poor-Condition Share | 18.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.2% |
| Average Bridge Age | 57 years |
| Poor-Condition Traffic Exposure | 5,308 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Adams County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 110th Street over Middle Nodaway River | Poor condition + traffic exposure | Poor | 30 | 1920 |
| 190th Street over Stream | Poor condition + traffic exposure | Poor | 20 | 1968 |
| 200th Street over Stream | Poor condition + traffic exposure | Poor | 15 | 1958 |
| Mulberry AVE over East Nodaway River | Poor condition + traffic exposure | Poor | 5 | 1900 |
| 2nd Street over Dreys Ditch | Poor condition + traffic exposure | Poor | 787 | 1920 |
| 6th Street over Stream | Poor condition + traffic exposure | Poor | 453 | 1970 |
| Fm-150th Street over East Nodaway River | Poor condition + traffic exposure | Poor | 399 | 1955 |
| 190th Street over Brown Branch | Poor condition + traffic exposure | Poor | 349 | 1965 |
| B Street over Middle Nodaway River | Poor condition + traffic exposure | Poor | 255 | 1968 |
| Fm-175th Street over Show Creek | Poor condition + traffic exposure | Poor | 199 | 1961 |
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.