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La Sierra Avenue over Lake Mathews Overflow

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

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

La Sierra Avenue over Lake Mathews Overflow in Riverside 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 1961, making it 64 years old at the 2025 inventory.
It carries about 5,291 vehicles a day (traffic count year 2014).
Its listed owner is the county highway agency.
It is one of 640 of the 1,120 inventoried bridges in Riverside County rated good (57.1%); 18 (1.6%) 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 multiple box beam
Length	about 70 ft
Location	1.0 Mi. N/o Cajalco Road
NBI structure number	56C0171
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 91 over BNSF Ry Amtrak Metrolink	1970	270,000	Fair
State Route 91 over Serfas Drive	1970	269,000	Good
Route 91 over Buena Vista Avenue	1961	268,000	Fair
State Route 91 over E91-n71 Connctr (future)	1970	267,000	Good
State Route 91 over Coal Canyon	1970	264,000	Good
State Route 91 over State Route 71	1970	264,000	Good