STATE ROUTE 91
STATE ROUTE 91 in 12-Ora-091-7.27-Ana, Orange County, California received a condition grade of B (70/100). Built in 1961, the bridge carries 225K vehicles daily on STATE ROUTE 91 over Carbon Cyn Diversion Cha.
STATE ROUTE 91 carries a B on the BridgeSafety Condition Score with 70/100. 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 1961 and is now 65 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 225,000 vehicles, with 10 lane(s) crossing Carbon Cyn Diversion Cha. 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 65-year-old bridge located 12-Ora-091-7.27-Ana in Orange County, California. The bridge carries STATE ROUTE 91 over Carbon Cyn Diversion Cha with 10 traffic lanes, handling approximately 225K vehicles per day. Built in 1961 and reconstructed in 1969, the structure spans 17.7 meters.
The bridge received a Condition Grade of B (70/100) 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 has a Condition Score of 70/100 (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 was built in 1961 and reconstructed in 1969, making it 65 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 91 carries approximately 225K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 17.7 meters long and located on STATE ROUTE 91 in 12-Ora-091-7.27-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-091-7.27-Ana in Orange County, California. The bridge carries STATE ROUTE 91 over Carbon Cyn Diversion Cha. Its coordinates are 33.847339, -117.856836. It is maintained by State Highway Agency.
STATE ROUTE 91 carries STATE ROUTE 91 over Carbon Cyn Diversion Cha. The bridge is 17.7 meters long and was built in 1961, with reconstruction in 1969.
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.