STATE ROUTE 91
STATE ROUTE 91 in 07-La-091-R10.81-Com, Los Angeles County, California received a condition grade of B (77/100). Built in 1974, the bridge carries 222K vehicles daily on STATE ROUTE 91 over Susana RD.
STATE ROUTE 91 carries a B on the BridgeSafety Condition Score with 77/100. 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 1974 and is now 52 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 222,000 vehicles, with 14 lane(s) crossing Susana 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 is a 52-year-old bridge located 07-La-091-R10.81-Com in Los Angeles County, California. The bridge carries STATE ROUTE 91 over Susana RD with 14 traffic lanes, handling approximately 222K vehicles per day. Built in 1974, the structure spans 51.2 meters.
The bridge received a Condition Grade of B (77/100) 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 77/100 (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 1974, making it 52 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 91 carries approximately 222K vehicles per day (average daily traffic). The bridge has 14 traffic lanes. It is 51.2 meters long and located on STATE ROUTE 91 in 07-La-091-R10.81-Com, Los Angeles 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 07-La-091-R10.81-Com in Los Angeles County, California. The bridge carries STATE ROUTE 91 over Susana RD. Its coordinates are 33.873228, -118.207400. It is maintained by State Highway Agency.
STATE ROUTE 91 carries STATE ROUTE 91 over Susana RD. The bridge is 51.2 meters long and was built in 1974.
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.