SR 55
SR 55 in 12-Ora-055-R4.77-Cms, Orange County, California received a condition grade of F (0/100). Built in 1973, the bridge carries 142K vehicles daily on SR 55 over Santa Ana Delhi Channel. It is classified as structurally deficient.
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 55 is a 53-year-old bridge located 12-Ora-055-R4.77-Cms in Orange County, California. The bridge carries SR 55 over Santa Ana Delhi Channel with 8 traffic lanes, handling approximately 142K vehicles per day. Built in 1973 and reconstructed in 1976, the structure spans 355.1 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below — this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
SR 55 has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
SR 55 was built in 1973 and reconstructed in 1976, making it 53 years old. The average bridge age in the United States is 48 years.
SR 55 carries approximately 142K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 355.1 meters long and located on SR 55 in 12-Ora-055-R4.77-Cms, Orange County, California.
Yes, SR 55 is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
SR 55 is located 12-Ora-055-R4.77-Cms in Orange County, California. The bridge carries SR 55 over Santa Ana Delhi Channel. Its coordinates are 33.673581, -117.885481. It is maintained by State Highway Agency.
SR 55 carries SR 55 over Santa Ana Delhi Channel. The bridge is 355.1 meters long and was built in 1973, with reconstruction in 1976.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.