US Bridges

Cunningham Road over Mariposa Creek

Good

Merced County, California · 3.3 MI S Childs Ave · Structure no. 39C0082

Built
1920
105 years old, rebuilt 1975
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
94 ft
5 main spans
Daily traffic
441
2015 count
Owner
County
County Highway Agency

About this bridge

Cunningham Road over Mariposa Creek is a concrete continuous slab carrying Cunningham Road over Mariposa Creek in Merced County, California. It was built in 1920 and reconstructed in 1975, so it is 105 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 441 vehicles a day, roughly 3% of them trucks, projected to reach 1,709 by 2043. The structure is 94 ft (28.7 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesCunningham Road
CrossesMariposa Creek
Location3.3 MI S Childs Ave
RouteCounty Highway 0
Coordinates37.23894, -120.25261
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 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.3 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length94 ft (28.7 m)
Longest span19 ft (5.7 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic441 (2015)
Projected traffic1,709 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Cunningham Road over Mariposa Creek built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1975.

What condition is Cunningham Road over Mariposa 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 2024.

How much traffic does Cunningham Road over Mariposa Creek carry?

About 441 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is Cunningham Road over Mariposa Creek?

The structure is 94 ft (28.7 m) long with a longest span of 19 ft (5.7 m) and a deck 33 ft wide.

Who owns Cunningham Road over Mariposa Creek?

It is owned by the County Highway Agency.