INTERSTATE 680
INTERSTATE 680 in 04-Scl-680-M7.63-Mps, Santa Clara County, California received a condition grade of B (61/100). Built in 1971, the bridge carries 137K vehicles daily on INTERSTATE 680 over SR 237 (Calaveras BLVD).
INTERSTATE 680 carries a B on the BridgeSafety Condition Score with 61/100. 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 1971 and is now 55 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 137,000 vehicles, with 10 lane(s) crossing SR 237 (Calaveras BLVD). 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 55-year-old bridge located 04-Scl-680-M7.63-Mps in Santa Clara County, California. The bridge carries INTERSTATE 680 over SR 237 (Calaveras BLVD) with 10 traffic lanes, handling approximately 137K vehicles per day. Built in 1971 and reconstructed in 2010, the structure spans 57.3 meters.
The bridge received a Condition Grade of B (61/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 5/9 (fair), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 680 has a Condition Score of 61/100 (Grade B). Its deck is rated 5/9, superstructure 5/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
INTERSTATE 680 was built in 1971 and reconstructed in 2010, making it 55 years old. The average bridge age in the United States is 48 years.
INTERSTATE 680 carries approximately 137K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 57.3 meters long and located on INTERSTATE 680 in 04-Scl-680-M7.63-Mps, Santa Clara County, California.
No, INTERSTATE 680 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
INTERSTATE 680 is located 04-Scl-680-M7.63-Mps in Santa Clara County, California. The bridge carries INTERSTATE 680 over SR 237 (Calaveras BLVD). Its coordinates are 37.434564, -121.888017. It is maintained by State Highway Agency.
INTERSTATE 680 carries INTERSTATE 680 over SR 237 (Calaveras BLVD). The bridge is 57.3 meters long and was built in 1971, with reconstruction in 2010.
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.