INTERSTATE 405 SB
INTERSTATE 405 SB in 07-La-405-0.46-Lbch, Los Angeles County, California received a condition grade of A (89/100). Built in 1993, the bridge carries 128K vehicles daily on INTERSTATE 405 SB over SB 405-Studebaker Offrmp.
INTERSTATE 405 SB carries an A on the BridgeSafety Condition Score with 89/100. Deck, superstructure, and substructure ratings all sit in the better tier of the FHWA NBI distribution. The bridge is structurally sound by federal standards.
The bridge was built in 1993, making it 33 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. INTERSTATE 405 SB carries an average daily traffic count of 127,500 vehicles, with 11 lane(s) crossing SB 405-Studebaker Offrmp. 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
INTERSTATE 405 SB is a 33-year-old bridge located 07-La-405-0.46-Lbch in Los Angeles County, California. The bridge carries INTERSTATE 405 SB over SB 405-Studebaker Offrmp with 11 traffic lanes, handling approximately 128K vehicles per day. Built in 1993, the structure spans 79.7 meters.
The bridge received a Condition Grade of A (89/100) based on Federal Highway Administration inspection data. Its deck is rated 8/9 (good), superstructure 8/9 (good), and substructure 8/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 405 SB has a Condition Score of 89/100 (Grade A). Its deck is rated 8/9, superstructure 8/9, and substructure 8/9 on the NBI scale. The bridge is not classified as structurally deficient.
INTERSTATE 405 SB was built in 1993, making it 33 years old. The average bridge age in the United States is 48 years.
INTERSTATE 405 SB carries approximately 128K vehicles per day (average daily traffic). The bridge has 11 traffic lanes. It is 79.7 meters long and located on INTERSTATE 405 SB in 07-La-405-0.46-Lbch, Los Angeles County, California.
No, INTERSTATE 405 SB is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
INTERSTATE 405 SB is located 07-La-405-0.46-Lbch in Los Angeles County, California. The bridge carries INTERSTATE 405 SB over SB 405-Studebaker Offrmp. Its coordinates are 33.791042, -118.099625. It is maintained by State Highway Agency.
INTERSTATE 405 SB carries INTERSTATE 405 SB over SB 405-Studebaker Offrmp. The bridge is 79.7 meters long and was built in 1993.
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.