Bridge conditions in Lyon County, Kansas
494 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Lyon County tracks close to typical: 4 of its 494 inventoried bridges (0.8%) are rated poor, against a national rate of about 7%.
- 4 of the 494 bridges in Lyon County, Kansas, are rated in poor condition (0.8%) in the 2025 National Bridge Inventory, as of .
- 318 bridges (64.4%) are rated good and 172 (34.8%) fair.
- The median Lyon County bridge was built in 1975.
- The busiest poor-rated bridge is Rd H 939.0-544.1 over Moon Branch Creek (built 1928), carrying about 80 vehicles a day.
Good 64.4% · Fair 34.8% · Poor 0.8% of 494 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Rd H 939.0-544.1 over Moon Branch Creek | 1928 | 80 | Poor |
| Rs 413 E.7-16.0 over Pester Creek | 1927 | 75 | Poor |
| Rd P (n.0-25.7) over Cottonwood River | 1910 | 30 | Poor |
| Rd. T (t.0-281) over Stream | 1971 | 30 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| URB1105 Indust over I-35 Hwy | 1994 | 12,935 | Good |
| US50 Hwy over Cottonwood Riv Drain | 1947 | 12,887 | Fair |
| I-35HWY over Lincoln St | 1965 | 10,914 | Fair |
| I-35 Hwy over Lincoln St | 2024 | 10,914 | Good |
| I-35 Hwy SB (kta) over Local Road Phenis Creek | 1956 | 9,014 | Good |
| I-35 Hwy NB (kta) over Local Road Phenis Creek | 1956 | 9,014 | Good |
| I-35 Hwy SB (kta) over Local Rd Phenis Creek | 1956 | 9,014 | Good |
| I-35 Hwy NB (kta) over Local Rd Phenis Creek | 1956 | 9,014 | Good |
| I-35 Hwy SB (kta) over Cottonwood River | 1956 | 9,014 | Fair |
| I-35 Hwy NB (kta) over Cottonwood River | 1956 | 9,014 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Kansas: Kansas bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.