INTERSTATE 380
INTERSTATE 380 in 04-Sm-380-5.73-Sbr, San Mateo County, California received a condition grade of B (68/100). Built in 1971, the bridge carries 150K vehicles daily on INTERSTATE 380 over Caltrain Up RR Bart Etc.
INTERSTATE 380 carries a B on the BridgeSafety Condition Score with 68/100. 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 380 carries an average daily traffic count of 150,000 vehicles, with 10 lane(s) crossing Caltrain Up RR Bart Etc. 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 380 is a 55-year-old bridge located 04-Sm-380-5.73-Sbr in San Mateo County, California. The bridge carries INTERSTATE 380 over Caltrain Up RR Bart Etc with 10 traffic lanes, handling approximately 150K vehicles per day. Built in 1971 and reconstructed in 1973, the structure spans 314.3 meters.
The bridge received a Condition Grade of B (68/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 380 has a Condition Score of 68/100 (Grade B). Its deck is rated 5/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
INTERSTATE 380 was built in 1971 and reconstructed in 1973, making it 55 years old. The average bridge age in the United States is 48 years.
INTERSTATE 380 carries approximately 150K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 314.3 meters long and located on INTERSTATE 380 in 04-Sm-380-5.73-Sbr, San Mateo County, California.
No, INTERSTATE 380 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 380 is located 04-Sm-380-5.73-Sbr in San Mateo County, California. The bridge carries INTERSTATE 380 over Caltrain Up RR Bart Etc. Its coordinates are 37.634058, -122.414508. It is maintained by State Highway Agency.
INTERSTATE 380 carries INTERSTATE 380 over Caltrain Up RR Bart Etc. The bridge is 314.3 meters long and was built in 1971, with reconstruction in 1973.
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.