US Bridges

Oak Grove Road over Striped Rock Creek

GoodPosted for load

Mariposa County, California · 0.2 MI N Madera CO · Structure no. 40C0028

Built
1912
113 years old
Condition
Good
inspected September 2023
Type
Truss - Thru
Steel
Length
104 ft
1 main span
Daily traffic
50
1991 count
Owner
County
County Highway Agency

About this bridge

Oak Grove Road over Striped Rock Creek is a steel truss - thru carrying Oak Grove Road over Striped Rock Creek in Mariposa County, California. It was built in 1912, so it is 113 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 81 by 2040. The structure is 104 ft (31.7 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesOak Grove Road
CrossesStriped Rock Creek
Location0.2 MI N Madera CO
RouteCounty Highway 0
CountyMariposa County
StateCalifornia
Coordinates37.32629, -119.88262
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating13.2 US tons
Inventory rating7.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length104 ft (31.7 m)
Longest span101 ft (30.8 m)
Deck width20 ft (6.2 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deck14 ft (4.2 m)

Traffic and service

Average daily traffic50 (1991)
Projected traffic81 by 2040
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Oak Grove Road over Striped Rock Creek built?

It was built in 1912, making it 113 years old in 2025.

What condition is Oak Grove Road over Striped Rock Creek 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 September 2023.

How much traffic does Oak Grove Road over Striped Rock Creek carry?

About 50 vehicles per day (1991 count).

How long is Oak Grove Road over Striped Rock Creek?

The structure is 104 ft (31.7 m) long with a longest span of 101 ft (30.8 m) and a deck 20 ft wide.

Who owns Oak Grove Road over Striped Rock Creek?

It is owned by the County Highway Agency.