STATE ROUTE 99
STATE ROUTE 99 in 06-Ker-099-27.80, Kern County, California received a condition grade of F (0/100). Built in 1933, the bridge carries 130K vehicles daily on STATE ROUTE 99 over Canal Lateral 29. It is classified as structurally deficient.
STATE ROUTE 99 carries an F on the BridgeSafety Condition Score with 0/100 — the bottom tier of the FHWA NBI distribution. Component ratings flag the structure for near-term rehabilitation or replacement; the bridge may remain open to traffic but is on the priority list for action.
The bridge was built in 1933, making it 93 years old — well beyond the typical 50-year design life of bridges constructed in that era. Bridges of this vintage usually need substantial rehabilitation or replacement once their original components have aged out, regardless of current condition ratings. STATE ROUTE 99 carries an average daily traffic count of 130,000 vehicles, with 9 lane(s) crossing Canal Lateral 29. 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 99 is a 93-year-old bridge located 06-Ker-099-27.80 in Kern County, California. The bridge carries STATE ROUTE 99 over Canal Lateral 29 with 9 traffic lanes, handling approximately 130K vehicles per day. Built in 1933 and reconstructed in 1964, the structure spans 10.1 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
STATE ROUTE 99 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.
STATE ROUTE 99 was built in 1933 and reconstructed in 1964, making it 93 years old. The average bridge age in the United States is 48 years.
STATE ROUTE 99 carries approximately 130K vehicles per day (average daily traffic). The bridge has 9 traffic lanes. It is 10.1 meters long and located on STATE ROUTE 99 in 06-Ker-099-27.80, Kern County, California.
Yes, STATE ROUTE 99 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.
STATE ROUTE 99 is located 06-Ker-099-27.80 in Kern County, California. The bridge carries STATE ROUTE 99 over Canal Lateral 29. Its coordinates are 35.411700, -119.053867. It is maintained by State Highway Agency.
STATE ROUTE 99 carries STATE ROUTE 99 over Canal Lateral 29. The bridge is 10.1 meters long and was built in 1933, with reconstruction in 1964.
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.