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Oak Flat Road over California Aqueduct

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

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

Oak Flat Road over California Aqueduct in Stanislaus County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1966, making it 59 years old at the 2025 inventory.
It carries about 158 vehicles a day (traffic count year 2018).
It is one of 214 of the 386 inventoried bridges in Stanislaus County rated fair (55.4%); 52 (13.5%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 150 ft
Location	0.4 Mi West of Ward Ave
NBI structure number	38C0211
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
State Route 99 over 9TH Street & UP RR	1963	121,000	Fair
State Route 99 over Second St-sb 99 on Ramp	1965	101,000	Good
State Route 99 over SB 99-north St Off Ramp	1965	101,000	Good
State Route 99 over Ceres Main Canal	1941	96,000	Fair
State Route 99 over Mitchell Rd	1965	96,000	Fair
Briggsmore Road over UP RR & Brink Avenue	1976	71,797	Poor