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300 Rd. over N. Cottonwood River

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

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

300 Rd. over N. Cottonwood River in Marion County, Kansas, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1981, making it 44 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 125 of the 323 inventoried bridges in Marion County rated good (38.7%); 35 (10.8%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous prestressed concrete tee beam
Length	about 109 ft
Location	1.4N 6.0W of Durham
NBI structure number	000570819505060
Condition class	Good

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