Lyon County Bridge Report Card
Lyon County scores 90 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Lyon County, Kansas
Lyon County has 494 bridges in the National Bridge Inventory, with 4 rated poor and 15 rated scour-critical. Its poor-condition share of 0.8% is at or below the 5.2% statewide average. Poor-condition bridges carry about 215 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Lyon County a Bridge Condition Exposure Score of 90/100 (A). The county has 494 bridges in the National Bridge Inventory, including 4 in poor condition and 15 rated scour-critical. Poor-condition bridges carry about 215 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 | 0.8% | 1.6 |
| Poor-condition traffic exposure | 25 | 0.0% of measured traffic | 0.0 |
| Scour-critical bridge share | 20 | 3.0% | 6.1 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 2.0 |
| Traffic-data completeness | 5 | 625,499 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 | 0.8% |
| State Poor-Condition Share | 5.2% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.0% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 215 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Lyon County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| RD H 939.0-544.1 over Moon Branch Creek | Poor condition + traffic exposure | Poor | 80 | 1928 |
| Rs 413 E.7-16.0 over Pester Creek | Poor condition + traffic exposure | Poor | 75 | 1927 |
| RD P (n.0-25.7) over Cottonwood River | Poor condition + traffic exposure | Poor | 30 | 1910 |
| Rd. T (t.0-281) over Stream | Poor condition + traffic exposure | Poor | 30 | 1971 |
| I-35 HWY SB over Badger Creek | Scour-critical foundation rating | Fair | 8,350 | 1976 |
| I-35 HWY NB over Badger Creek | Scour-critical foundation rating | Fair | 8,350 | 1976 |
| I-35 HWY NB over Dry Creek | Scour-critical foundation rating | Good | 8,250 | 1976 |
| I-35 HWY SB over Dry Creek | Scour-critical foundation rating | Good | 8,250 | 1976 |
| South Avenue over Channel | Scour-critical foundation rating | Good | 6,000 | 1990 |
| I-335 HWY (kta) SB over 142 Mile Creek | Scour-critical foundation rating | Fair | 5,825 | 1956 |
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.