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Chestnut-s101 Onrp over UP RR Amtrak US 101 Rmps

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

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

Chestnut-s101 Onrp over UP RR Amtrak US 101 Rmps in Ventura 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 1961, making it 64 years old at the 2025 inventory.
It carries about 12,706 vehicles a day (traffic count year 2018).
Its listed owner is the state highway agency.
It is one of 201 of the 501 inventoried bridges in Ventura County rated fair (40.1%); 12 (2.4%) 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 multiple box beam
Length	about 883 ft
Location	07-ven-101-30.10-ven
NBI structure number	52 0217K
Condition class	Fair

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 Hampshire Rd	1966	193,000	Fair
U.S. Highway 101 over Conejo School Rd	1966	193,000	Fair
U.S. Highway 101 over Rancho Rd	1970	193,000	Good
U.S. Highway 101 over S101-n23 Connector Ramp	1970	193,000	Good
U.S. Highway 101 over Moorpark Rd	1962	192,000	Fair
U.S. Highway 101 over Hillside	1982	192,000	Good