STATE ROUTE 13
STATE ROUTE 13 in 04-Ala-013-9.07-Oak, Alameda County, California received a condition grade of C (58/100). Built in 1951, the bridge carries 136K vehicles daily on STATE ROUTE 13 over Broadway Terrace.
STATE ROUTE 13 carries a C on the BridgeSafety Condition Score with 58/100. 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 1951 and is now 75 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. STATE ROUTE 13 carries an average daily traffic count of 136,000 vehicles, with 4 lane(s) crossing Broadway Terrace. 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
STATE ROUTE 13 is a 75-year-old bridge located 04-Ala-013-9.07-Oak in Alameda County, California. The bridge carries STATE ROUTE 13 over Broadway Terrace with 4 traffic lanes, handling approximately 136K vehicles per day. Built in 1951, the structure spans 36.3 meters.
The bridge received a Condition Grade of C (58/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 5/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
STATE ROUTE 13 has a Condition Score of 58/100 (Grade C). Its deck is rated 7/9, superstructure 7/9, and substructure 5/9 on the NBI scale. The bridge is not classified as structurally deficient.
STATE ROUTE 13 was built in 1951, making it 75 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 13 carries approximately 136K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 36.3 meters long and located on STATE ROUTE 13 in 04-Ala-013-9.07-Oak, Alameda County, California.
No, STATE ROUTE 13 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
STATE ROUTE 13 is located 04-Ala-013-9.07-Oak in Alameda County, California. The bridge carries STATE ROUTE 13 over Broadway Terrace. Its coordinates are 37.841425, -122.224400. It is maintained by State Highway Agency.
STATE ROUTE 13 carries STATE ROUTE 13 over Broadway Terrace. The bridge is 36.3 meters long and was built in 1951.
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.