US Bridges

Gazos Creek Road over Hillside

Fair

San Mateo County, California · 0.8 MI E/O Cloverdale RD · Structure no. 35C0193

Built
1983
42 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Single or Spread
Steel
Length
67 ft
1 main span
Daily traffic
75
2016 count
Owner
County
County Highway Agency

About this bridge

Gazos Creek Road over Hillside is a steel box beam or girders - single or spread carrying Gazos Creek Road over Hillside in San Mateo County, California. It was built in 1983, so it is 42 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 75 vehicles a day, projected to reach 84 by 2046. The structure is 67 ft (20.4 m) long and 9 ft wide. If it were closed, the detour would be 15.5 mi (25 km).

Location

Open in Google Maps
CarriesGazos Creek Road
CrossesHillside
Location0.8 MI E/O Cloverdale RD
RouteCounty Highway 0
CountySan Mateo County
StateCalifornia
Coordinates37.18731, -122.32835
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length67 ft (20.4 m)
Longest span66 ft (20 m)
Deck width9 ft (2.7 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2016)
Projected traffic84 by 2046
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed15.5 mi (25 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gazos Creek Road over Hillside built?

It was built in 1983, making it 42 years old in 2025.

What condition is Gazos Creek Road over Hillside in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Gazos Creek Road over Hillside carry?

About 75 vehicles per day (2016 count).

How long is Gazos Creek Road over Hillside?

The structure is 67 ft (20.4 m) long with a longest span of 66 ft (20 m) and a deck 9 ft wide.

Who owns Gazos Creek Road over Hillside?

It is owned by the County Highway Agency.