INTERSTATE 580
INTERSTATE 580 in 04-Ala-580-13.13, Alameda County, California received a condition grade of B (61/100). Built in 1972, the bridge carries 208K vehicles daily on INTERSTATE 580 over Arroyo Las Positas.
INTERSTATE 580 carries a B on the BridgeSafety Condition Score with 61/100. 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 1972 and is now 54 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 208,000 vehicles, with 13 lane(s) crossing Arroyo Las Positas. 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 54-year-old bridge located 04-Ala-580-13.13 in Alameda County, California. The bridge carries INTERSTATE 580 over Arroyo Las Positas with 13 traffic lanes, handling approximately 208K vehicles per day. Built in 1972 and reconstructed in 2016, the structure spans 53.8 meters.
The bridge received a Condition Grade of B (61/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 7/9 (good), and substructure 5/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 580 has a Condition Score of 61/100 (Grade B). Its deck is rated 5/9, superstructure 7/9, and substructure 5/9 on the NBI scale. The bridge is not classified as structurally deficient.
INTERSTATE 580 was built in 1972 and reconstructed in 2016, making it 54 years old. The average bridge age in the United States is 48 years.
INTERSTATE 580 carries approximately 208K vehicles per day (average daily traffic). The bridge has 13 traffic lanes. It is 53.8 meters long and located on INTERSTATE 580 in 04-Ala-580-13.13, 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-580-13.13 in Alameda County, California. The bridge carries INTERSTATE 580 over Arroyo Las Positas. Its coordinates are 37.699950, -121.784469. It is maintained by State Highway Agency.
INTERSTATE 580 carries INTERSTATE 580 over Arroyo Las Positas. The bridge is 53.8 meters long and was built in 1972, with reconstruction in 2016.
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.