STATE ROUTE 91 EB
STATE ROUTE 91 EB in 12-Ora-091-R14.43r, Orange County, California received a condition grade of B (75/100). Built in 1971, the bridge carries 152K vehicles daily on STATE ROUTE 91 EB over Weir Canyon RD.
STATE ROUTE 91 EB carries a B on the BridgeSafety Condition Score with 75/100. 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. STATE ROUTE 91 EB carries an average daily traffic count of 152,000 vehicles, with 8 lane(s) crossing Weir 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
STATE ROUTE 91 EB is a 55-year-old bridge located 12-Ora-091-R14.43r in Orange County, California. The bridge carries STATE ROUTE 91 EB over Weir Canyon RD with 8 traffic lanes, handling approximately 152K vehicles per day. Built in 1971 and reconstructed in 1996, the structure spans 47.5 meters.
The bridge received a Condition Grade of B (75/100) 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
STATE ROUTE 91 EB has a Condition Score of 75/100 (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.
STATE ROUTE 91 EB was built in 1971 and reconstructed in 1996, making it 55 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 91 EB carries approximately 152K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 47.5 meters long and located on STATE ROUTE 91 EB in 12-Ora-091-R14.43r, Orange County, California.
No, STATE ROUTE 91 EB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
STATE ROUTE 91 EB is located 12-Ora-091-R14.43r in Orange County, California. The bridge carries STATE ROUTE 91 EB over Weir Canyon RD. Its coordinates are 33.870019, -117.744639. It is maintained by State Highway Agency.
STATE ROUTE 91 EB carries STATE ROUTE 91 EB over Weir Canyon RD. The bridge is 47.5 meters long and was built in 1971, with reconstruction in 1996.
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.