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Silverado Trail over Dutch Henry Creek

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

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

Silverado Trail over Dutch Henry Creek in Napa County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1938 and reconstructed in 1976, making it 87 years old at the 2025 inventory.
It carries about 4,310 vehicles a day (traffic count year 2005).
Its listed owner is the county highway agency.
It is one of 81 of the 160 inventoried bridges in Napa County rated fair (50.6%); 8 (5.0%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 36 ft
Location	.4 Mi N/o Larkmead Lane
NBI structure number	21C0030
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 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