I 580
I 580 in 3/4mi N Of Plumb 3/4mi S, Washoe County, Nevada received a condition grade of B (78/100). Built in 1977, the bridge carries 170K vehicles daily on I 580 over Vassar ST.
I 580 carries a B on the BridgeSafety Condition Score with 78/100. 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 1977, making it 49 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. I 580 carries an average daily traffic count of 170,000 vehicles, with 10 lane(s) crossing Vassar ST. 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
I 580 is a 49-year-old bridge located 3/4mi N Of Plumb 3/4mi S in Washoe County, Nevada. The bridge carries I 580 over Vassar ST with 10 traffic lanes, handling approximately 170K vehicles per day. Built in 1977, the structure spans 36.5 meters.
The bridge received a Condition Grade of B (78/100) 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
I 580 has a Condition Score of 78/100 (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.
I 580 was built in 1977, making it 49 years old. The average bridge age in the United States is 48 years.
I 580 carries approximately 170K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 36.5 meters long and located on I 580 in 3/4mi N Of Plumb 3/4mi S, Washoe County, Nevada.
No, I 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.
I 580 is located 3/4mi N Of Plumb 3/4mi S in Washoe County, Nevada. The bridge carries I 580 over Vassar ST. Its coordinates are 39.512997, -119.781206. It is maintained by State Highway Agency.
I 580 carries I 580 over Vassar ST. The bridge is 36.5 meters long and was built in 1977.
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.