STATE ROUTE 78
STATE ROUTE 78 in 11-Sd-078-14.99-Smcs, San Diego County, California received a condition grade of B (63/100). Built in 1962, the bridge carries 158K vehicles daily on STATE ROUTE 78 over Mission RD Nctd Bnsf Ry.
STATE ROUTE 78 carries a B on the BridgeSafety Condition Score with 63/100. 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 78 carries an average daily traffic count of 158,000 vehicles, with 8 lane(s) crossing Mission RD Nctd Bnsf Ry. 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 78 is a 64-year-old bridge located 11-Sd-078-14.99-Smcs in San Diego County, California. The bridge carries STATE ROUTE 78 over Mission RD Nctd Bnsf Ry with 8 traffic lanes, handling approximately 158K vehicles per day. Built in 1962 and reconstructed in 2013, the structure spans 109.1 meters.
The bridge received a Condition Grade of B (63/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 5/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
STATE ROUTE 78 has a Condition Score of 63/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 5/9 on the NBI scale. The bridge is not classified as structurally deficient.
STATE ROUTE 78 was built in 1962 and reconstructed in 2013, making it 64 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 78 carries approximately 158K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 109.1 meters long and located on STATE ROUTE 78 in 11-Sd-078-14.99-Smcs, San Diego County, California.
No, STATE ROUTE 78 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 78 is located 11-Sd-078-14.99-Smcs in San Diego County, California. The bridge carries STATE ROUTE 78 over Mission RD Nctd Bnsf Ry. Its coordinates are 33.134739, -117.128772. It is maintained by State Highway Agency.
STATE ROUTE 78 carries STATE ROUTE 78 over Mission RD Nctd Bnsf Ry. The bridge is 109.1 meters long and was built in 1962, with reconstruction in 2013.
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.