N680-E580 CONN
N680-E580 CONN in 04-Ala-680-R20.01-Ple, Alameda County, California received a condition grade of B (70/100). Built in 2001, the bridge carries 158K vehicles daily on N680-E580 CONN over E580&S680 Off San Ramon.
N680-E580 CONN carries a B on the BridgeSafety Condition Score with 70/100. 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 2001, making it 25 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. N680-E580 CONN carries an average daily traffic count of 158,000 vehicles, with 2 lane(s) crossing E580&S680 Off San Ramon. 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
N680-E580 CONN is a 25-year-old bridge located 04-Ala-680-R20.01-Ple in Alameda County, California. The bridge carries N680-E580 CONN over E580&S680 Off San Ramon with 2 traffic lanes, handling approximately 158K vehicles per day. Built in 2001, the structure spans 553.8 meters.
The bridge received a Condition Grade of B (70/100) 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
N680-E580 CONN has a Condition Score of 70/100 (Grade B). 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.
N680-E580 CONN was built in 2001, making it 25 years old. The average bridge age in the United States is 48 years.
N680-E580 CONN carries approximately 158K vehicles per day (average daily traffic). The bridge has 2 traffic lanes. It is 553.8 meters long and located on N680-E580 CONN in 04-Ala-680-R20.01-Ple, Alameda County, California.
No, N680-E580 CONN is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
N680-E580 CONN is located 04-Ala-680-R20.01-Ple in Alameda County, California. The bridge carries N680-E580 CONN over E580&S680 Off San Ramon. Its coordinates are 37.700553, -121.920650. It is maintained by State Highway Agency.
N680-E580 CONN carries N680-E580 CONN over E580&S680 Off San Ramon. The bridge is 553.8 meters long and was built in 2001.
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.