INTERSTATE 8
INTERSTATE 8 in 11-Sd-008-11.76-Lmsa, San Diego County, California received a condition grade of B (60/100). Built in 1956, the bridge carries 194K vehicles daily on INTERSTATE 8 over Jackson DR.
INTERSTATE 8 carries a B on the BridgeSafety Condition Score with 60/100. 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 1956 and is now 70 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 8 carries an average daily traffic count of 194,000 vehicles, with 13 lane(s) crossing Jackson DR. 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 8 is a 70-year-old bridge located 11-Sd-008-11.76-Lmsa in San Diego County, California. The bridge carries INTERSTATE 8 over Jackson DR with 13 traffic lanes, handling approximately 194K vehicles per day. Built in 1956 and reconstructed in 1990, the structure spans 42.1 meters.
The bridge received a Condition Grade of B (60/100) 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
INTERSTATE 8 has a Condition Score of 60/100 (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.
INTERSTATE 8 was built in 1956 and reconstructed in 1990, making it 70 years old. The average bridge age in the United States is 48 years.
INTERSTATE 8 carries approximately 194K vehicles per day (average daily traffic). The bridge has 13 traffic lanes. It is 42.1 meters long and located on INTERSTATE 8 in 11-Sd-008-11.76-Lmsa, San Diego County, California.
No, INTERSTATE 8 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 8 is located 11-Sd-008-11.76-Lmsa in San Diego County, California. The bridge carries INTERSTATE 8 over Jackson DR. Its coordinates are 32.774633, -117.011061. It is maintained by State Highway Agency.
INTERSTATE 8 carries INTERSTATE 8 over Jackson DR. The bridge is 42.1 meters long and was built in 1956, with reconstruction in 1990.
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.