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CR 4F/NAST Colony over Frying Pan River

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

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

CR 4F/NAST Colony over Frying Pan River in Pitkin County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1958 and reconstructed in 1984, making it 67 years old at the 2025 inventory.
It carries about 3 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 42 of the 65 inventoried bridges in Pitkin County rated fair (64.6%); 0 (0.0%) 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	Timber stringer or multi-beam girder
Length	about 65 ft
Location	.3 Mi S of CR 105/MP 31.8
NBI structure number	PIT-04F-1.0
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SH 82 Ml over Co Rd Castle Creek	1961	25,000	Fair
SH 82 Ml Ebnd over Draw	2005	22,000	Good
SH 82 ML-S/E Bound over Draw	2004	22,000	Good
SH 82 Ml Ebnd over Draw	2003	22,000	Good
SH 82 Ml over Stage Road	1994	22,000	Good
SH 82 Ml over Maroon Creek	2005	22,000	Fair