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Deer Park Road over Napa River

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

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

Deer Park Road over Napa River in Napa 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 1966, making it 59 years old at the 2025 inventory.
It carries about 3,115 vehicles a day (traffic count year 2012).
Its listed owner is the county highway agency.
It is one of 8 of the 160 inventoried bridges in Napa County rated poor (5.0%); 8 (5.0%) 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 175 ft
Location	0.5 Mi NE SR 29
NBI structure number	21C0023
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
State Route 29 over State Route 221 (soscol)	2024	79,300	Good
State Route 29 over American Canyon Creek	1943	48,000	Fair
State Route 29 over Nvrr Napa River Stanly	1977	48,000	Poor
State Route 29 over Stanley Creek	1981	48,000	Fair
State Route 29 over Dry Creek	1970	43,000	Fair
St Rte 29 Byway E over Craig Creek	1958	43,000	Good