INTERSTATE 680
INTERSTATE 680 in 04-Cc-680-R4.46-Dnvl, Contra Costa County, California received a condition grade of F (0/100). Built in 1966, the bridge carries 176K vehicles daily on INTERSTATE 680 over San Ramon Creek. It is classified as structurally deficient.
INTERSTATE 680 carries an F on the BridgeSafety Condition Score with 0/100 — the bottom tier of the FHWA NBI distribution. Component ratings flag the structure for near-term rehabilitation or replacement; the bridge may remain open to traffic but is on the priority list for action.
The bridge was built in 1966 and is now 60 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. INTERSTATE 680 carries an average daily traffic count of 176,400 vehicles, with 10 lane(s) crossing San Ramon Creek. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
INTERSTATE 680 is a 60-year-old bridge located 04-Cc-680-R4.46-Dnvl in Contra Costa County, California. The bridge carries INTERSTATE 680 over San Ramon Creek with 10 traffic lanes, handling approximately 176K vehicles per day. Built in 1966, the structure spans 7.9 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below, this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 680 has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
INTERSTATE 680 was built in 1966, making it 60 years old. The average bridge age in the United States is 48 years.
INTERSTATE 680 carries approximately 176K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 7.9 meters long and located on INTERSTATE 680 in 04-Cc-680-R4.46-Dnvl, Contra Costa County, California.
Yes, INTERSTATE 680 is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
INTERSTATE 680 is located 04-Cc-680-R4.46-Dnvl in Contra Costa County, California. The bridge carries INTERSTATE 680 over San Ramon Creek. Its coordinates are 37.781214, -121.976989. It is maintained by State Highway Agency.
INTERSTATE 680 carries INTERSTATE 680 over San Ramon Creek. The bridge is 7.9 meters long and was built in 1966.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.