Allen County Bridge Report Card
Allen County scores 59 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Allen County, Kansas
Allen County has 227 bridges in the National Bridge Inventory, with 25 rated poor and 12 rated scour-critical. Its poor-condition share of 11.0% is above the 5.2% statewide average. Poor-condition bridges carry about 1,925 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Allen County a Bridge Condition Exposure Score of 59/100 (F). The county has 227 bridges in the National Bridge Inventory, including 25 in poor condition and 12 rated scour-critical. Poor-condition bridges carry about 1,925 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 | 11.0% | 22.0 |
| Poor-condition traffic exposure | 25 | 1.1% of measured traffic | 0.8 |
| Scour-critical bridge share | 20 | 5.3% | 10.6 |
| Average age vs national baseline | 10 | 67 years vs 48 nationally | 7.6 |
| Traffic-data completeness | 5 | 177,509 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 | 11.0% |
| State Poor-Condition Share | 5.2% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.3% |
| Average Bridge Age | 67 years |
| Poor-Condition Traffic Exposure | 1,925 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Allen County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Local RD 21.1-i.0 over Marmaton River | Poor condition + traffic exposure | Poor | 50 | 1940 |
| Local RD 1.8-j.0 over Stream | Poor condition + traffic exposure | Poor | 30 | 1940 |
| 400 St. 2.0-k.5 over Stream | Poor condition + traffic exposure | Poor | 30 | 1940 |
| Rs 4 over Branch Of Deer Creek | Poor condition + traffic exposure | Poor | 300 | 1935 |
| Walnut Street over Coon Creek | Poor condition + traffic exposure | Poor | 250 | 1930 |
| Buckeye Street over Coon Creek | Poor condition + traffic exposure | Poor | 150 | 1910 |
| Sycamore Street over Coon Creek | Poor condition + traffic exposure | Poor | 150 | 1930 |
| Rs 1132 over Trib. To Neosho River | Poor condition + traffic exposure | Poor | 106 | 1930 |
| Rs 1151 over Big Creek | Poor condition + traffic exposure | Poor | 99 | 1930 |
| Rs 1151 over Branch Of Marmaton River | Poor condition + traffic exposure | Poor | 99 | 1935 |
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.