ROUTE 91
ROUTE 91 in 08-Riv-091-15.10-Riv, Riverside County, California received a condition grade of B (62/100). Built in 1959, the bridge carries 203K vehicles daily on ROUTE 91 over Monroe Street.
ROUTE 91 carries a B on the BridgeSafety Condition Score with 62/100. 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 1959 and is now 67 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 91 carries an average daily traffic count of 203,000 vehicles, with 10 lane(s) crossing Monroe Street. 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 91 is a 67-year-old bridge located 08-Riv-091-15.10-Riv in Riverside County, California. The bridge carries ROUTE 91 over Monroe Street with 10 traffic lanes, handling approximately 203K vehicles per day. Built in 1959 and reconstructed in 2004, the structure spans 25.6 meters.
The bridge received a Condition Grade of B (62/100) 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 91 has a Condition Score of 62/100 (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 91 was built in 1959 and reconstructed in 2004, making it 67 years old. The average bridge age in the United States is 48 years.
ROUTE 91 carries approximately 203K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 25.6 meters long and located on ROUTE 91 in 08-Riv-091-15.10-Riv, Riverside County, California.
No, 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.
ROUTE 91 is located 08-Riv-091-15.10-Riv in Riverside County, California. The bridge carries ROUTE 91 over Monroe Street. Its coordinates are 33.922969, -117.427147. It is maintained by State Highway Agency.
ROUTE 91 carries ROUTE 91 over Monroe Street. The bridge is 25.6 meters long and was built in 1959, with reconstruction in 2004.
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.