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Bridge conditions in Logan County, Kansas

55 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

The federal inventory lists 55 bridges in Logan County: 33 rated good, 20 fair, and 2 poor.

2 of the 55 bridges in Logan County, Kansas, are rated in poor condition (3.6%) in the 2025 National Bridge Inventory, as of August 20, 2026.
33 bridges (60.0%) are rated good and 20 (36.4%) fair.
The median Logan County bridge was built in 1961.
The busiest poor-rated bridge is US40 Hwy over N Fk Smoky Hill River (built 1957), carrying about 1,056 vehicles a day.

Good 60.0% · Fair 36.4% · Poor 3.6% of 55 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
US40 Hwy over N Fk Smoky Hill River	1957	1,056	Poor
160 Road (rs 246) over N. Fork Smoky Hill River	1928	140	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I70 Hwy WB over UP Railroad	1965	5,600	Good
I70 Hwy EB over UP Railroad	1965	5,600	Good
US83 Hwy over Plum Creek	1982	3,558	Good
US-83 Hwy over Smoky Hill River	1995	3,558	Good
US-83 Hwy over Smoky Hill River Drain	1996	3,558	Good
US-83 Hiway over Hackberry CR N Br	1998	3,520	Good
US83 Hwy over Mid Br Hackberry CR	1982	1,917	Good
US-83 Hiway over Hackberry CR S Br	1998	1,917	Good
US-40 Hwy over N Branch Hackberry Creek	2023	1,348	Good
US40 Hwy over Middle Br Hackberry CR	1958	1,165	Fair

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.