U.S. HIGHWAY 101
U.S. HIGHWAY 101 in 04-Mrn-101-18.15, Marin County, California received a condition grade of C (43/100). Built in 1928, the bridge carries 139K vehicles daily on U.S. HIGHWAY 101 over Arroyo De San Jose.
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
U.S. HIGHWAY 101 is a 98-year-old bridge located 04-Mrn-101-18.15 in Marin County, California. The bridge carries U.S. HIGHWAY 101 over Arroyo De San Jose with 13 traffic lanes, handling approximately 139K vehicles per day. Built in 1928 and reconstructed in 1964, the structure spans 8.5 meters.
The bridge received a Condition Grade of C (43/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 7/9 (good), and substructure 5/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
U.S. HIGHWAY 101 has a Condition Score of 43/100 (Grade C). Its deck is rated 5/9, superstructure 7/9, and substructure 5/9 on the NBI scale. The bridge is not classified as structurally deficient.
U.S. HIGHWAY 101 was built in 1928 and reconstructed in 1964, making it 98 years old. The average bridge age in the United States is 48 years.
U.S. HIGHWAY 101 carries approximately 139K vehicles per day (average daily traffic). The bridge has 13 traffic lanes. It is 8.5 meters long and located on U.S. HIGHWAY 101 in 04-Mrn-101-18.15, Marin County, California.
No, U.S. HIGHWAY 101 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
U.S. HIGHWAY 101 is located 04-Mrn-101-18.15 in Marin County, California. The bridge carries U.S. HIGHWAY 101 over Arroyo De San Jose. Its coordinates are 38.068019, -122.538114. It is maintained by State Highway Agency.
U.S. HIGHWAY 101 carries U.S. HIGHWAY 101 over Arroyo De San Jose. The bridge is 8.5 meters long and was built in 1928, with reconstruction in 1964.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.