ROUTE 55
ROUTE 55 in 12-Ora-055-15.24-Ora, Orange County, California received a condition grade of B (63/100). Built in 1961, the bridge carries 228K vehicles daily on ROUTE 55 over Katella AVE.
ROUTE 55 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 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. ROUTE 55 carries an average daily traffic count of 228,000 vehicles, with 10 lane(s) crossing Katella AVE. 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 55 is a 65-year-old bridge located 12-Ora-055-15.24-Ora in Orange County, California. The bridge carries ROUTE 55 over Katella AVE with 10 traffic lanes, handling approximately 228K vehicles per day. Built in 1961 and reconstructed in 2002, the structure spans 56.6 meters.
The bridge received a Condition Grade of B (63/100) 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 55 has a Condition Score of 63/100 (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 55 was built in 1961 and reconstructed in 2002, making it 65 years old. The average bridge age in the United States is 48 years.
ROUTE 55 carries approximately 228K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 56.6 meters long and located on ROUTE 55 in 12-Ora-055-15.24-Ora, Orange County, California.
No, ROUTE 55 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 55 is located 12-Ora-055-15.24-Ora in Orange County, California. The bridge carries ROUTE 55 over Katella AVE. Its coordinates are 33.810033, -117.831678. It is maintained by State Highway Agency.
ROUTE 55 carries ROUTE 55 over Katella AVE. The bridge is 56.6 meters long and was built in 1961, with reconstruction in 2002.
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.