US Bridges

Mariposa Road over Duck Creek

Fair

San Joaquin County, California · 0.25 MI S/E of SR 99 · Structure no. 29C0451

Built
2016
9 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
4,642
2013 count
Owner
County
County Highway Agency

About this bridge

Mariposa Road over Duck Creek is a prestressed concrete slab carrying Mariposa Road over Duck Creek in San Joaquin County, California. It was built in 2016, so it is 9 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 4,642 vehicles a day, roughly 40% of them trucks, projected to reach 9,847 by 2042. The structure is 67 ft (20.4 m) long and 106 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMariposa Road
CrossesDuck Creek
Location0.25 MI S/E of SR 99
CountySan Joaquin County
StateCalifornia
Coordinates37.93247, -121.23049
Functional classUrban Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length67 ft (20.4 m)
Longest span67 ft (20.4 m)
Deck width106 ft (32.2 m)
Roadway width93 ft (28.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,642 (2013)
Projected traffic9,847 by 2042
Trucks40%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 Mariposa Road over Duck Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is Mariposa Road over Duck Creek 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 September 2024.

How much traffic does Mariposa Road over Duck Creek carry?

About 4,642 vehicles per day (2013 count), of which roughly 40% are trucks.

How long is Mariposa Road over Duck Creek?

The structure is 67 ft (20.4 m) long with a longest span of 67 ft (20.4 m) and a deck 106 ft wide.

Who owns Mariposa Road over Duck Creek?

It is owned by the County Highway Agency.