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County Road 6W over South Fork Big Creek

Jackson County, Colorado · rated Fair in the 2025 National Bridge Inventory

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

County Road 6W over South Fork Big Creek in Jackson County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1977 and reconstructed in 2000, making it 48 years old at the 2025 inventory.
It carries about 130 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 32 of the 47 inventoried bridges in Jackson County rated fair (68.1%); 2 (4.3%) 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	Steel stringer or multi-beam girder
Length	about 25 ft
Location	18.3 Mi W St Hwy 125
NBI structure number	057006W18.3001A
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SH 125 Ml over Michigan River	2012	2,400	Good
SH 125 Ml over Illinois River	1993	2,200	Good
SH 14 Ml over Grizzly Creek	1949	1,300	Fair
SH 14 Ml over Grizzly Creek	1950	1,300	Fair
SH 14 Ml over Colorado Creek	1949	1,300	Fair
SH 14 Ml over Arapahoe Creek	1950	1,300	Fair