SR 51
SR 51 in SR 51 @ Grand Canal, Maricopa County, Arizona received a condition grade of B (78/100). Built in 1987, the bridge carries 180K vehicles daily on SR 51 over Grand Canal.
SR 51 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 1987, making it 39 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. SR 51 carries an average daily traffic count of 180,062 vehicles, with 9 lane(s) crossing Grand Canal. 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
SR 51 is a 39-year-old bridge located SR 51 @ Grand Canal in Maricopa County, Arizona. The bridge carries SR 51 over Grand Canal with 9 traffic lanes, handling approximately 180K vehicles per day. Built in 1987, the structure spans 39 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
SR 51 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.
SR 51 was built in 1987, making it 39 years old. The average bridge age in the United States is 48 years.
SR 51 carries approximately 180K vehicles per day (average daily traffic). The bridge has 9 traffic lanes. It is 39 meters long and located on SR 51 in SR 51 @ Grand Canal, Maricopa County, Arizona.
No, SR 51 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
SR 51 is located SR 51 @ Grand Canal in Maricopa County, Arizona. The bridge carries SR 51 over Grand Canal. Its coordinates are 33.484900, -112.040600. It is maintained by State Highway Agency.
SR 51 carries SR 51 over Grand Canal. The bridge is 39 meters long and was built in 1987.
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.