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170 Rd. over South Cottonwood River

Marion County, Kansas · rated Poor in the 2025 National Bridge Inventory

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

170 Rd. over South Cottonwood River in Marion County, Kansas, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 3 (serious condition) on the 0-9 scale.
It was built in 1920, making it 105 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 35 of the 323 inventoried bridges in Marion County rated poor (10.8%); 35 (10.8%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	3	Serious condition

Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.

Bridge	Built	Vehicles/day	Condition
US-50 Hwy over Spring Creek	1994	5,402	Good
US-50 Hwy over Doyle Creek Drainage	1994	5,097	Good
US-50 Hwy over Doyle Creek Drainage	1998	5,097	Good
US-50 Hwy over Doyle Creek Drainage	1998	5,097	Good
US-50 Hwy over Doyle Creek Drainage	1998	5,097	Good
US-50 Hwy over Union Pacific RR.	1994	4,812	Good