US Bridges

Darrah Road over West Fk Chowchilla River

Good

Mariposa County, California · 0.7 MI N of SR 49 · Structure no. 40C0070

Built
2023
2 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete
Length
52 ft
1 main span
Daily traffic
1,460
1988 count
Owner
County
County Highway Agency

About this bridge

Darrah Road over West Fk Chowchilla River is a concrete slab carrying Darrah Road over West Fk Chowchilla River in Mariposa County, California. It was built in 2023, so it is 2 years old, younger 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 1,460 vehicles a day, roughly 3% of them trucks, projected to reach 2,137 by 2040. The structure is 52 ft (15.7 m) long and 35 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesDarrah Road
CrossesWest Fk Chowchilla River
Location0.7 MI N of SR 49
RouteCounty Highway 0
CountyMariposa County
StateCalifornia
Coordinates37.47064, -119.87964
Functional classRural Major Collector

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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length52 ft (15.7 m)
Longest span47 ft (14.3 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,460 (1988)
Projected traffic2,137 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Darrah Road over West Fk Chowchilla River built?

It was built in 2023, making it 2 years old in 2025.

What condition is Darrah Road over West Fk Chowchilla River 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 Darrah Road over West Fk Chowchilla River carry?

About 1,460 vehicles per day (1988 count), of which roughly 3% are trucks.

How long is Darrah Road over West Fk Chowchilla River?

The structure is 52 ft (15.7 m) long with a longest span of 47 ft (14.3 m) and a deck 35 ft wide.

Who owns Darrah Road over West Fk Chowchilla River?

It is owned by the County Highway Agency.