US Bridges

ST Louis RD over Slate Creek

Fair

Plumas County, California · At Plumas CO Line · Structure no. 09C0154

Built
1990
35 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
110 ft
2 main spans
Daily traffic
50
2019 count
Owner
County
County Highway Agency

About this bridge

ST Louis RD over Slate Creek is a concrete continuous box beam or girders - single or spread carrying ST Louis RD over Slate Creek in Plumas County, California. It was built in 1990, so it is 35 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 54 by 2044. The structure is 110 ft (33.5 m) long and 16 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesST Louis RD
CrossesSlate Creek
LocationAt Plumas CO Line
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates39.69165, -120.93876
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.8 US tons
Inventory rating52.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span85 ft (25.9 m)
Deck width16 ft (4.8 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2019)
Projected traffic54 by 2044
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 ST Louis RD over Slate Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is ST Louis RD over Slate 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 October 2023.

How much traffic does ST Louis RD over Slate Creek carry?

About 50 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is ST Louis RD over Slate Creek?

The structure is 110 ft (33.5 m) long with a longest span of 85 ft (25.9 m) and a deck 16 ft wide.

Who owns ST Louis RD over Slate Creek?

It is owned by the County Highway Agency.