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Grant Line Road over Delta-mendota Canal

Alameda County, California · rated Poor in the 2025 National Bridge Inventory

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

Grant Line Road over Delta-mendota Canal in Alameda County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1948, making it 77 years old at the 2025 inventory.
It carries about 5,100 vehicles a day (traffic count year 2014).
Its listed owner is the county highway agency.
It is one of 42 of the 662 inventoried bridges in Alameda County rated poor (6.3%); 42 (6.3%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Continuous concrete tee beam
Length	about 123 ft
Location	1.8 Mi NE of I 580
NBI structure number	33C0053
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Interstate 80 over Gilman Street	1955	550,000	Good
Interstate 80 over Powell Street	1954	531,000	Good
Interstate 80 over Buried Walkway	1954	531,000	Fair
Interstate 80 over Temescal Creek	1936	288,000	Good
Interstate 580 over Maple Ave	1963	274,000	Fair
Interstate 80 WB over UP BNSF Amtrak E80-w580	1960	271,000	Good