US Bridges

State Route 33 over Poso Slough

Fair

Merced County, California · 10-MER-033-4.37 · Structure no. 39 0054

Built
1962
63 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete
Length
34 ft
1 main span
Daily traffic
5,200
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 33 over Poso Slough is a concrete tee beam carrying State Route 33 over Poso Slough in Merced County, California. It was built in 1962, so it is 63 years old, older 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 5,200 vehicles a day, roughly 14% of them trucks, projected to reach 5,946 by 2045. The structure is 34 ft (10.5 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesState Route 33
CrossesPoso Slough
Location10-MER-033-4.37
RouteState Highway 33
CountyMerced County
StateCalifornia
Coordinates37.03209, -120.63555
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating36.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length34 ft (10.5 m)
Longest span33 ft (10.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2009)
Projected traffic5,946 by 2045
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 33 over Poso Slough built?

It was built in 1962, making it 63 years old in 2025.

What condition is State Route 33 over Poso Slough 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 2023.

How much traffic does State Route 33 over Poso Slough carry?

About 5,200 vehicles per day (2009 count), of which roughly 14% are trucks.

How long is State Route 33 over Poso Slough?

The structure is 34 ft (10.5 m) long with a longest span of 33 ft (10.2 m) and a deck 43 ft wide.

Who owns State Route 33 over Poso Slough?

It is owned by the State Highway Agency.