US Bridges

Wilder Road over State Route 24

Good

Contra Costa County, California · 04-CC-024-1.20 · Structure no. 28 0187

Built
1964
61 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
306 ft
3 main spans
Daily traffic
4,460
2019 count
Owner
State
State Highway Agency

About this bridge

Wilder Road over State Route 24 is a steel stringer/multi-beam or girder carrying Wilder Road over State Route 24 in Contra Costa County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,460 vehicles a day, roughly 1% of them trucks, projected to reach 6,413 by 2042. The structure is 306 ft (93.3 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesWilder Road
CrossesState Route 24
Location04-CC-024-1.20
RouteCounty Highway 0
Coordinates37.8678, -122.19856
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating93.6 US tons
Inventory rating56.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length306 ft (93.3 m)
Longest span112 ft (34.1 m)
Deck width37 ft (11.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,460 (2019)
Projected traffic6,413 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Wilder Road over State Route 24 built?

It was built in 1964, making it 61 years old in 2025.

What condition is Wilder Road over State Route 24 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Wilder Road over State Route 24 carry?

About 4,460 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Wilder Road over State Route 24?

The structure is 306 ft (93.3 m) long with a longest span of 112 ft (34.1 m) and a deck 37 ft wide.

Who owns Wilder Road over State Route 24?

It is owned by the State Highway Agency.