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Interstate 15 over Ninth Avenue

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

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

Interstate 15 over Ninth Avenue in San Diego 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 1977 and reconstructed in 2012, making it 48 years old at the 2025 inventory.
It carries about 99,500 vehicles a day (traffic count year 2018).
Its listed owner is the state highway agency.
It is one of 869 of the 1,632 inventoried bridges in San Diego County rated good (53.2%); 39 (2.4%) 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 196 ft
Location	11-sd-015-r30.09-esd
NBI structure number	57 0808
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Interstate 15 over Mira Mesa Blvd	1977	283,000	Fair
Interstate 805 over Bonita Road	1975	272,000	Fair
Interstate 805 over Telegraph Canyon Road	1971	254,000	Good
Interstate 805 over Telegraph Canyon Drain	1971	250,000	Poor
Interstate 5 over San Elijo Lagoon	2022	247,000	Good
Interstate 5 over Carmel Valley Rd	1964	245,000	Good