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State Route 58 WB over Union Pacific RR (UP RR)

Kern County, California · rated Good in the 2025 National Bridge Inventory

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

State Route 58 WB over Union Pacific RR (UP RR) in Kern County, California, 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 2003, making it 22 years old at the 2025 inventory.
It carries about 14,500 vehicles a day (traffic count year 2018).
Its listed owner is the state highway agency.
It is one of 332 of the 668 inventoried bridges in Kern County rated good (49.7%); 37 (5.5%) 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 prestressed concrete multiple box beam
Length	about 252 ft
Location	09-ker-058-m111.78
NBI structure number	50 0495L
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
State Route 99 over Kern River	1961	140,000	Fair
State Route 99 over BNSF Ry & Amtrak	1961	132,000	Good
State Route 99 over California Avenue	1963	132,000	Good
State Route 99 over SR 178 (rosedale Hwy)	1963	132,000	Good
State Route 99 over Truxtun Ave	1963	132,000	Good
State Route 99 over Canal Lateral 29	1933	130,000	Good