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Walnut Ave over Santa Margarita Creek

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

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

Walnut Ave over Santa Margarita Creek in San Luis Obispo 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 1940 and reconstructed in 1996, making it 85 years old at the 2025 inventory.
It carries about 271 vehicles a day (traffic count year 2017).
Its listed owner is the county highway agency.
It is one of 22 of the 402 inventoried bridges in San Luis Obispo County rated poor (5.5%); 22 (5.5%) 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	Timber stringer or multi-beam girder
Length	about 96 ft
Location	Btwn Pine Av & Chstnut Av
NBI structure number	49C0170
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 Stenner Creek	1978	62,000	Good
U.S. Highway 101 over Perfuma Creek	1948	56,000	Good
US Highway 101 NB over Santa Maria River	1962	56,000	Fair
U.S. Highway 101 over Brisco Rd	1956	56,000	Good
U.S. Highway 101 over Whitehorse Draw	1952	54,000	Good
US Highway 101 over St Rte 41 (@PM15.96)	2010	53,000	Good