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Local Rd 21.1-i.0 over Marmaton River

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

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

Local Rd 21.1-i.0 over Marmaton River in Allen County, Kansas, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1940, making it 85 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2006).
Its listed owner is the county highway agency.
It is one of 25 of the 227 inventoried bridges in Allen County rated poor (11.0%); 25 (11.0%) 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


Structure	Steel stringer or multi-beam girder
Length	about 27 ft
Location	0.5N 1.0E of Moran
NBI structure number	000011057105860
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US54 Hwy over Rock Creek	1969	6,854	Good
US-54 Hwy over Rock Creek Overflow	1998	6,854	Good
Old US169 K57 Hwy over Neosho River Drainage	2002	5,500	Good
Old US169 K57 Hwy over Elm Creek	1948	5,500	Good
Old US169 K57 Hwy over Deer Creek Drainage	1930	5,235	Fair
N. Washington Ave. over Coon Creek	1988	5,000	Fair