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County Road 38 over Boulder Creek

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

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

County Road 38 over Boulder Creek in Boulder 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1988, making it 37 years old at the 2025 inventory.
It carries about 1,640 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 211 of the 321 inventoried bridges in Boulder County rated fair (65.7%); 7 (2.2%) 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 prestressed concrete tee beam
Length	about 96 ft
Location	1.5 Mi W of Co Rd 901
NBI structure number	BC-38-6.7-BO1
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 36 Ml over South Boulder Creek	1951	77,000	Good
US 36 Ml over Davidson Ditch	2015	77,000	Good
US 36 Ml over Coal Creek	2015	66,000	Good
US 36 Ml over Canyon Creek	1951	45,000	Fair
Table Mesa Drive over US 36 Ml	1951	44,000	Fair
SH 157 Ramp over US 36 Ml	1971	44,000	Fair