STATE ROUTE 24
STATE ROUTE 24 in 04-Ala-024-R5.08-Oak, Alameda County, California received a condition grade of B (71/100). Built in 1970, the bridge carries 147K vehicles daily on STATE ROUTE 24 over State Route 13.
STATE ROUTE 24 carries a B on the BridgeSafety Condition Score with 71/100. 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. STATE ROUTE 24 carries an average daily traffic count of 147,000 vehicles, with 8 lane(s) crossing State Route 13. 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 24 is a 56-year-old bridge located 04-Ala-024-R5.08-Oak in Alameda County, California. The bridge carries STATE ROUTE 24 over State Route 13 with 8 traffic lanes, handling approximately 147K vehicles per day. Built in 1970, the structure spans 87.3 meters.
The bridge received a Condition Grade of B (71/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 6/9 (fair), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
STATE ROUTE 24 has a Condition Score of 71/100 (Grade B). Its deck is rated 7/9, superstructure 6/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
STATE ROUTE 24 was built in 1970, making it 56 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 24 carries approximately 147K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 87.3 meters long and located on STATE ROUTE 24 in 04-Ala-024-R5.08-Oak, Alameda County, California.
No, STATE ROUTE 24 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 24 is located 04-Ala-024-R5.08-Oak in Alameda County, California. The bridge carries STATE ROUTE 24 over State Route 13. Its coordinates are 37.848633, -122.228661. It is maintained by State Highway Agency.
STATE ROUTE 24 carries STATE ROUTE 24 over State Route 13. The bridge is 87.3 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.