US Bridges

Plainsburg Road over State Route 99

Fair

Merced County, California · 10-MER-099-3.36 · Structure no. 39 0237

Built
2015
10 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
256 ft
2 main spans
Daily traffic
6,000
2016 count
Owner
State
State Highway Agency

About this bridge

Plainsburg Road over State Route 99 is a prestressed concrete continuous box beam or girders - multiple carrying Plainsburg Road over State Route 99 in Merced County, California. It was built in 2015, so it is 10 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 6,000 vehicles a day, roughly 25% of them trucks, projected to reach 7,309 by 2046. The structure is 256 ft (78 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesPlainsburg Road
CrossesState Route 99
Location10-MER-099-3.36
RouteCounty Highway 0
CountyMerced County
StateCalifornia
Coordinates37.18901, -120.33192
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length256 ft (78 m)
Longest span131 ft (39.8 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2016)
Projected traffic7,309 by 2046
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed8.1 mi (13 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 Plainsburg Road over State Route 99 built?

It was built in 2015, making it 10 years old in 2025.

What condition is Plainsburg Road over State Route 99 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 April 2024.

How much traffic does Plainsburg Road over State Route 99 carry?

About 6,000 vehicles per day (2016 count), of which roughly 25% are trucks.

How long is Plainsburg Road over State Route 99?

The structure is 256 ft (78 m) long with a longest span of 131 ft (39.8 m) and a deck 43 ft wide.

Who owns Plainsburg Road over State Route 99?

It is owned by the State Highway Agency.