US HIGHWAY 101 NB
US HIGHWAY 101 NB in 04-Sf-101-1.14-Sf, San Francisco County, California received a condition grade of B (75/100). Built in 1970, the bridge carries 195K vehicles daily on US HIGHWAY 101 NB over Bayshore BLVD Viaduct.
US HIGHWAY 101 NB carries a B on the BridgeSafety Condition Score with 75/100. 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 1970 and is now 56 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. US HIGHWAY 101 NB carries an average daily traffic count of 195,400 vehicles, with 10 lane(s) crossing Bayshore BLVD Viaduct. 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
US HIGHWAY 101 NB is a 56-year-old bridge located 04-Sf-101-1.14-Sf in San Francisco County, California. The bridge carries US HIGHWAY 101 NB over Bayshore BLVD Viaduct with 10 traffic lanes, handling approximately 195K vehicles per day. Built in 1970, the structure spans 196.6 meters.
The bridge received a Condition Grade of B (75/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
US HIGHWAY 101 NB has a Condition Score of 75/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
US HIGHWAY 101 NB was built in 1970, making it 56 years old. The average bridge age in the United States is 48 years.
US HIGHWAY 101 NB carries approximately 195K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 196.6 meters long and located on US HIGHWAY 101 NB in 04-Sf-101-1.14-Sf, San Francisco County, California.
No, US HIGHWAY 101 NB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
US HIGHWAY 101 NB is located 04-Sf-101-1.14-Sf in San Francisco County, California. The bridge carries US HIGHWAY 101 NB over Bayshore BLVD Viaduct. Its coordinates are 37.723981, -122.401089. It is maintained by State Highway Agency.
US HIGHWAY 101 NB carries US HIGHWAY 101 NB over Bayshore BLVD Viaduct. The bridge is 196.6 meters long and was built in 1970.
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.