INTERSTATE 405
INTERSTATE 405 in 07-La-405-8.19-Lbch, Los Angeles County, California received a condition grade of B (70/100). Built in 1961, the bridge carries 238K vehicles daily on INTERSTATE 405 over 223rd Street Oh.
INTERSTATE 405 carries a B on the BridgeSafety Condition Score with 70/100. 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. INTERSTATE 405 carries an average daily traffic count of 237,800 vehicles, with 10 lane(s) crossing 223rd Street Oh. 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 is a 65-year-old bridge located 07-La-405-8.19-Lbch in Los Angeles County, California. The bridge carries INTERSTATE 405 over 223rd Street Oh with 10 traffic lanes, handling approximately 238K vehicles per day. Built in 1961 and reconstructed in 1998, the structure spans 43.6 meters.
The bridge received a Condition Grade of B (70/100) 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
INTERSTATE 405 has a Condition Score of 70/100 (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.
INTERSTATE 405 was built in 1961 and reconstructed in 1998, making it 65 years old. The average bridge age in the United States is 48 years.
INTERSTATE 405 carries approximately 238K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 43.6 meters long and located on INTERSTATE 405 in 07-La-405-8.19-Lbch, Los Angeles County, California.
No, INTERSTATE 405 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 is located 07-La-405-8.19-Lbch in Los Angeles County, California. The bridge carries INTERSTATE 405 over 223rd Street Oh. Its coordinates are 33.825561, -118.217444. It is maintained by State Highway Agency.
INTERSTATE 405 carries INTERSTATE 405 over 223rd Street Oh. The bridge is 43.6 meters long and was built in 1961, with reconstruction in 1998.
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.