INTERSTATE 580
INTERSTATE 580 in 04-Ala-580-R34.55-Sln, Alameda County, California received a condition grade of B (72/100). Built in 1964, the bridge carries 140K vehicles daily on INTERSTATE 580 over San Leandro Creek.
INTERSTATE 580 carries a B on the BridgeSafety Condition Score with 72/100. 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 1964 and is now 62 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. INTERSTATE 580 carries an average daily traffic count of 140,000 vehicles, with 8 lane(s) crossing San Leandro Creek. 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
INTERSTATE 580 is a 62-year-old bridge located 04-Ala-580-R34.55-Sln in Alameda County, California. The bridge carries INTERSTATE 580 over San Leandro Creek with 8 traffic lanes, handling approximately 140K vehicles per day. Built in 1964, the structure spans 73.8 meters.
The bridge received a Condition Grade of B (72/100) 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
INTERSTATE 580 has a Condition Score of 72/100 (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.
INTERSTATE 580 was built in 1964, making it 62 years old. The average bridge age in the United States is 48 years.
INTERSTATE 580 carries approximately 140K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 73.8 meters long and located on INTERSTATE 580 in 04-Ala-580-R34.55-Sln, Alameda County, California.
No, INTERSTATE 580 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
INTERSTATE 580 is located 04-Ala-580-R34.55-Sln in Alameda County, California. The bridge carries INTERSTATE 580 over San Leandro Creek. Its coordinates are 37.730556, -122.138497. It is maintained by State Highway Agency.
INTERSTATE 580 carries INTERSTATE 580 over San Leandro Creek. The bridge is 73.8 meters long and was built 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.
Source: FHWA National Bridge Inventory, 2026.