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State Route 152 WB over San Luis Dam Forebay

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

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

State Route 152 WB over San Luis Dam Forebay in Merced 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 1964 and reconstructed in 1987, making it 61 years old at the 2025 inventory.
It carries about 14,375 vehicles a day (traffic count year 2009).
Its listed owner is the state highway agency.
It is one of 314 of the 532 inventoried bridges in Merced County rated fair (59.0%); 23 (4.3%) 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 560 ft
Location	10-mer-152-r10.05
NBI structure number	39 0145L
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 Turlock Canal	1935	65,000	Fair
State Route 99 NB over 15TH Street	1962	51,000	Fair
State Route 99 over West 16TH St UP RR	2013	51,000	Fair
State Route 99 over UPRR & 16TH Street	2015	51,000	Fair
State Route 99 over Athlone Drain	2015	39,000	Good
State Route 99 SB over El Capitan Way	1980	37,000	Fair