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Marine Avenue over Balboa Island Channel

Orange County, California · rated Fair in the 2025 National Bridge Inventory

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

Marine Avenue over Balboa Island Channel in Orange County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1930 and reconstructed in 1981, making it 95 years old at the 2025 inventory.
It carries about 12,000 vehicles a day (traffic count year 2020).
Its listed owner is a city or municipal highway agency.
It is one of 479 of the 1,181 inventoried bridges in Orange County rated fair (40.6%); 33 (2.8%) 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 concrete tee beam
Length	about 398 ft
Location	0.1 Mi. S/o Bayside Drive
NBI structure number	55C0014
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Interstate 405 over Bolsa Chica Ditch	1959	374,000	Fair
Route 5 over Route 55	1955	329,500	Fair
Interstate 5 over La Paz Rd	1959	327,000	Fair
Interstate 5 over Red Hill Ave	1992	324,300	Fair
State Route 91 over Patt Drain #4	1959	319,000	Good
State Route 91 over Patt Drain #5	1959	319,000	Good