WHIPPLE AVENUE
WHIPPLE AVENUE in 04-Sm-101-6.62-Rdwc, San Mateo County, California received a condition grade of B (69/100). Built in 1958, the bridge carries 201K vehicles daily on WHIPPLE AVENUE over US Highway 101.
WHIPPLE AVENUE carries a B on the BridgeSafety Condition Score with 69/100. 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 1958 and is now 68 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. WHIPPLE AVENUE carries an average daily traffic count of 201,000 vehicles, with 4 lane(s) crossing US Highway 101. 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
WHIPPLE AVENUE is a 68-year-old bridge located 04-Sm-101-6.62-Rdwc in San Mateo County, California. The bridge carries WHIPPLE AVENUE over US Highway 101 with 4 traffic lanes, handling approximately 201K vehicles per day. Built in 1958 and reconstructed in 1984, the structure spans 52.7 meters.
The bridge received a Condition Grade of B (69/100) 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
WHIPPLE AVENUE has a Condition Score of 69/100 (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.
WHIPPLE AVENUE was built in 1958 and reconstructed in 1984, making it 68 years old. The average bridge age in the United States is 48 years.
WHIPPLE AVENUE carries approximately 201K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 52.7 meters long and located on WHIPPLE AVENUE in 04-Sm-101-6.62-Rdwc, San Mateo County, California.
No, WHIPPLE AVENUE is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
WHIPPLE AVENUE is located 04-Sm-101-6.62-Rdwc in San Mateo County, California. The bridge carries WHIPPLE AVENUE over US Highway 101. Its coordinates are 37.496081, -122.233081. It is maintained by State Highway Agency.
WHIPPLE AVENUE carries WHIPPLE AVENUE over US Highway 101. The bridge is 52.7 meters long and was built in 1958, with reconstruction in 1984.
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.