INTERSTATE 8
INTERSTATE 8 in 11-Sd-008-10.61-Lmsa, San Diego County, California received a condition grade of F (0/100). Built in 1939, the bridge carries 175K vehicles daily on INTERSTATE 8 over Alvarado Canyon Creek. It is classified as structurally deficient.
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 8 is a 87-year-old bridge located 11-Sd-008-10.61-Lmsa in San Diego County, California. The bridge carries INTERSTATE 8 over Alvarado Canyon Creek with 9 traffic lanes, handling approximately 175K vehicles per day. Built in 1939 and reconstructed in 1961, the structure spans 9.8 meters.
The bridge received a Condition Grade of F (0/100) based on Federal Highway Administration inspection data. Its deck is rated 0/9 (serious), superstructure 0/9 (serious), and substructure 0/9 (serious). The bridge is classified as structurally deficient, meaning at least one major component is rated 4 or below — this signals a need for repair or replacement but does not necessarily indicate an immediate safety hazard.
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
INTERSTATE 8 has a Condition Score of 0/100 (Grade F). Its deck is rated 0/9, superstructure 0/9, and substructure 0/9 on the NBI scale. The bridge is classified as structurally deficient.
INTERSTATE 8 was built in 1939 and reconstructed in 1961, making it 87 years old. The average bridge age in the United States is 48 years.
INTERSTATE 8 carries approximately 175K vehicles per day (average daily traffic). The bridge has 9 traffic lanes. It is 9.8 meters long and located on INTERSTATE 8 in 11-Sd-008-10.61-Lmsa, San Diego County, California.
Yes, INTERSTATE 8 is classified as structurally deficient because at least one of its primary components (deck, superstructure, or substructure) is rated 4 or below on the 0-9 NBI scale. This does not necessarily mean it is unsafe, but it requires significant repair or replacement.
INTERSTATE 8 is located 11-Sd-008-10.61-Lmsa in San Diego County, California. The bridge carries INTERSTATE 8 over Alvarado Canyon Creek. Its coordinates are 32.772942, -117.029553. It is maintained by State Highway Agency.
INTERSTATE 8 carries INTERSTATE 8 over Alvarado Canyon Creek. The bridge is 9.8 meters long and was built in 1939, with reconstruction in 1961.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.