ROUTE 57
ROUTE 57 in 12-Ora-057-21.78, Orange County, California received a condition grade of B (68/100). Built in 1971, the bridge carries 210K vehicles daily on ROUTE 57 over Tonner Canyon RD.
ROUTE 57 carries a B on the BridgeSafety Condition Score with 68/100. 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 1971 and is now 55 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. ROUTE 57 carries an average daily traffic count of 210,000 vehicles, with 10 lane(s) crossing Tonner Canyon RD. 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
ROUTE 57 is a 55-year-old bridge located 12-Ora-057-21.78 in Orange County, California. The bridge carries ROUTE 57 over Tonner Canyon RD with 10 traffic lanes, handling approximately 210K vehicles per day. Built in 1971, the structure spans 148.7 meters.
The bridge received a Condition Grade of B (68/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 7/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
ROUTE 57 has a Condition Score of 68/100 (Grade B). Its deck is rated 5/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
ROUTE 57 was built in 1971, making it 55 years old. The average bridge age in the United States is 48 years.
ROUTE 57 carries approximately 210K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 148.7 meters long and located on ROUTE 57 in 12-Ora-057-21.78, Orange County, California.
No, ROUTE 57 is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
ROUTE 57 is located 12-Ora-057-21.78 in Orange County, California. The bridge carries ROUTE 57 over Tonner Canyon RD. Its coordinates are 33.937519, -117.877317. It is maintained by State Highway Agency.
ROUTE 57 carries ROUTE 57 over Tonner Canyon RD. The bridge is 148.7 meters long and was built in 1971.
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.