INTERSTATE 680
INTERSTATE 680 in 04-Cc-680-R17.70-Plhl, Contra Costa County, California received a condition grade of B (67/100). Built in 1998, the bridge carries 235K vehicles daily on INTERSTATE 680 over Monument Boulevard. It is classified as structurally deficient.
INTERSTATE 680 carries a B on the BridgeSafety Condition Score with 67/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1998, making it 28 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. INTERSTATE 680 carries an average daily traffic count of 235,000 vehicles, with 11 lane(s) crossing Monument Boulevard. 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 28-year-old bridge located 04-Cc-680-R17.70-Plhl in Contra Costa County, California. The bridge carries INTERSTATE 680 over Monument Boulevard with 11 traffic lanes, handling approximately 235K vehicles per day. Built in 1998, the structure spans 168.3 meters.
The bridge received a Condition Grade of B (67/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 4/9 (poor), and substructure 7/9 (good). 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 67/100 (Grade B). Its deck is rated 7/9, superstructure 4/9, and substructure 7/9 on the NBI scale. The bridge is classified as structurally deficient.
INTERSTATE 680 was built in 1998, making it 28 years old. The average bridge age in the United States is 48 years.
INTERSTATE 680 carries approximately 235K vehicles per day (average daily traffic). The bridge has 11 traffic lanes. It is 168.3 meters long and located on INTERSTATE 680 in 04-Cc-680-R17.70-Plhl, 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-R17.70-Plhl in Contra Costa County, California. The bridge carries INTERSTATE 680 over Monument Boulevard. Its coordinates are 37.944556, -122.058236. It is maintained by State Highway Agency.
INTERSTATE 680 carries INTERSTATE 680 over Monument Boulevard. The bridge is 168.3 meters long and was built in 1998.
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.