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County Rd 15 over Prairie Dog Creek

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

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

County Rd 15 over Prairie Dog Creek in Thomas 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 1959, making it 66 years old at the 2025 inventory.
It carries about 120 vehicles a day (traffic count year 2020).
Its listed owner is the county highway agency.
It is one of 51 of the 82 inventoried bridges in Thomas County rated good (62.2%); 2 (2.4%) 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 steel stringer or multi-beam girder
Length	about 61 ft
Location	1.3S 4.0W of Colby
NBI structure number	000970413003863
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
K25 Hwy over Prairie Dog Creek Drg	1965	7,096	Fair
US24 Hwy over Prairie Dog Creek Drg	1938	6,605	Good
I70 Hwy Wl-el over S Fork Solomon River	1966	6,400	Poor
I-70 Highway over N Fork Solomon River	1965	6,350	Good
I-70 Hwy Westbound over Union Pacific Railroad	1965	6,350	Good
I-70 Hwy Eastbound over Union Pacific Railroad	1965	6,350	Good