STATE ROUTE 91
STATE ROUTE 91 in 12-Ora-091-8.57-Ana, Orange County, California received a condition grade of B (63/100). Built in 1954, the bridge carries 213K vehicles daily on STATE ROUTE 91 over Santa Ana River.
STATE ROUTE 91 carries a B on the BridgeSafety Condition Score with 63/100. 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 1954 and is now 72 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 carries an average daily traffic count of 213,000 vehicles, with 12 lane(s) crossing Santa Ana River. 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 is a 72-year-old bridge located 12-Ora-091-8.57-Ana in Orange County, California. The bridge carries STATE ROUTE 91 over Santa Ana River with 12 traffic lanes, handling approximately 213K vehicles per day. Built in 1954 and reconstructed in 1994, the structure spans 265 meters.
The bridge received a Condition Grade of B (63/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (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
STATE ROUTE 91 has a Condition Score of 63/100 (Grade B). Its deck is rated 6/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
STATE ROUTE 91 was built in 1954 and reconstructed in 1994, making it 72 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 91 carries approximately 213K vehicles per day (average daily traffic). The bridge has 12 traffic lanes. It is 265 meters long and located on STATE ROUTE 91 in 12-Ora-091-8.57-Ana, Orange County, California.
No, STATE ROUTE 91 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 is located 12-Ora-091-8.57-Ana in Orange County, California. The bridge carries STATE ROUTE 91 over Santa Ana River. Its coordinates are 33.849725, -117.835819. It is maintained by State Highway Agency.
STATE ROUTE 91 carries STATE ROUTE 91 over Santa Ana River. The bridge is 265 meters long and was built in 1954, with reconstruction in 1994.
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.