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County Road 26 over Left Hand Creek

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

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

County Road 26 over Left Hand Creek in Boulder County, Colorado, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 1991, making it 34 years old at the 2025 inventory.
It carries about 121 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 103 of the 321 inventoried bridges in Boulder County rated good (32.1%); 7 (2.2%) 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	Prestressed concrete single box beam
Length	about 60 ft
Location	0.6 Mi W of Co Rd 33
NBI structure number	BC-26-5.3-LT1
Condition class	Good

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