ST RTE 101 (5TH ST
ST RTE 101 (5TH ST in 04-Sf-101-4.12-Sf, San Francisco County, California received a condition grade of C (53/100). Built in 1955, the bridge carries 257K vehicles daily on ST RTE 101 (5TH ST over Bayshore Viaduct.
ST RTE 101 (5TH ST carries a C on the BridgeSafety Condition Score with 53/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1955 and is now 71 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. ST RTE 101 (5TH ST carries an average daily traffic count of 256,700 vehicles, with 6 lane(s) crossing Bayshore 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
ST RTE 101 (5TH ST is a 71-year-old bridge located 04-Sf-101-4.12-Sf in San Francisco County, California. The bridge carries ST RTE 101 (5TH ST over Bayshore Viaduct with 6 traffic lanes, handling approximately 257K vehicles per day. Built in 1955, the structure spans 2286.6 meters.
The bridge received a Condition Grade of C (53/100) 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
ST RTE 101 (5TH ST has a Condition Score of 53/100 (Grade C). 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.
ST RTE 101 (5TH ST was built in 1955, making it 71 years old. The average bridge age in the United States is 48 years.
ST RTE 101 (5TH ST carries approximately 257K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 2286.6 meters long and located on ST RTE 101 (5TH ST in 04-Sf-101-4.12-Sf, San Francisco County, California.
No, ST RTE 101 (5TH ST is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
ST RTE 101 (5TH ST is located 04-Sf-101-4.12-Sf in San Francisco County, California. The bridge carries ST RTE 101 (5TH ST over Bayshore Viaduct. Its coordinates are 37.764311, -122.404817. It is maintained by State Highway Agency.
ST RTE 101 (5TH ST carries ST RTE 101 (5TH ST over Bayshore Viaduct. The bridge is 2286.6 meters long and was built in 1955.
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.