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3200 RD Mile 21 over Big Hill Creek

Montgomery County, Kansas · rated Fair in the 2025 National Bridge Inventory

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

3200 RD Mile 21 over Big Hill Creek in Montgomery County, Kansas, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1992, making it 33 years old at the 2025 inventory.
It carries about 10 vehicles a day (traffic count year 2010).
Its listed owner is the county highway agency.
It is one of 203 of the 326 inventoried bridges in Montgomery County rated fair (62.3%); 18 (5.5%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 79 ft
Location	1.0S 0.5E of Liberty
NBI structure number	000631009506940
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US166 US169 Hwy over Verdigris River	1948	10,188	Good
US75 US160 Hwy over UP RR 20TH ST & Drg.	1940	8,501	Good
US169 Hwy over Onion Creek Overflow	1988	6,903	Good
US169 Hwy over Onion Creek	1988	6,903	Good
Eighth Street; 001 over Sycamore Creek	1984	5,950	Fair
US160 K96 Hwy over Mouse Creek	1960	5,920	Fair