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Main Road over Little Butano Creek

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

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

Main Road over Little Butano Creek in San Mateo County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1980, making it 45 years old at the 2025 inventory.
It carries about 70 vehicles a day (traffic count year 2018).
It is one of 37 of the 361 inventoried bridges in San Mateo County rated poor (10.2%); 37 (10.2%) 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	Steel stringer or multi-beam girder
Length	about 53 ft
Location	Butano St Prk 0.4 Mi In
NBI structure number	35P0005
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
U.S. Highway 101 over San Mateo Creek	1928	236,000	Good
US 101 Rollins Rd over Transmission Canal	1928	232,000	Fair
US 101 Mcdonnell over Millbrae Slough	1947	226,000	Fair
US 101 W&e Bayshr over San Francisquito Creek	2018	225,800	Good
Holly Street over US Highway 101	1954	201,000	Fair
Whipple Avenue over US Highway 101	1958	201,000	Good