STATE ROUTE 170
STATE ROUTE 170 in 07-La-170-R15.37-La, Los Angeles County, California received a condition grade of B (71/100). Built in 1962, the bridge carries 184K vehicles daily on STATE ROUTE 170 over Magnolia BLVD.
STATE ROUTE 170 carries a B on the BridgeSafety Condition Score with 71/100. 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 1962 and is now 64 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 170 carries an average daily traffic count of 184,000 vehicles, with 10 lane(s) crossing Magnolia BLVD. 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 170 is a 64-year-old bridge located 07-La-170-R15.37-La in Los Angeles County, California. The bridge carries STATE ROUTE 170 over Magnolia BLVD with 10 traffic lanes, handling approximately 184K vehicles per day. Built in 1962, the structure spans 50.9 meters.
The bridge received a Condition Grade of B (71/100) 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 170 has a Condition Score of 71/100 (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 170 was built in 1962, making it 64 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 170 carries approximately 184K vehicles per day (average daily traffic). The bridge has 10 traffic lanes. It is 50.9 meters long and located on STATE ROUTE 170 in 07-La-170-R15.37-La, Los Angeles County, California.
No, STATE ROUTE 170 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 170 is located 07-La-170-R15.37-La in Los Angeles County, California. The bridge carries STATE ROUTE 170 over Magnolia BLVD. Its coordinates are 34.164689, -118.382369. It is maintained by State Highway Agency.
STATE ROUTE 170 carries STATE ROUTE 170 over Magnolia BLVD. The bridge is 50.9 meters long and was built in 1962.
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.