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State Route 242 over Clayton Road-s242 on Rmp

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

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

State Route 242 over Clayton Road-s242 on Rmp in Contra Costa 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 1986 and reconstructed in 2000, making it 39 years old at the 2025 inventory.
It carries about 80,000 vehicles a day (traffic count year 2009).
Its listed owner is the state highway agency.
It is one of 306 of the 622 inventoried bridges in Contra Costa County rated fair (49.2%); 56 (9.0%) 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


Structure	Continuous prestressed concrete multiple box beam
Length	about 166 ft
Location	04-cc-242-r0.78-cnd
NBI structure number	28 0289
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Interstate 680 over Canal & Bike Path	1956	257,000	Fair
Interstate 680 over Monument Boulevard	1998	235,000	Poor
Interstate 680 over Parkside Drive	1960	235,000	Good
Interstate 680 over Rudgear Road	1964	197,400	Good
Interstate 680 over Livorna Road	1964	197,400	Good
Interstate 680 over Newell Avenue	1994	195,300	Fair