US Bridges

Road 23N37 over Eureka Creek

PoorPosted for load

Plumas County, California · Eureka Creek · Structure no. 051151000001007

Built
1942
83 years old, rebuilt 1988
Condition
Poor
inspected September 2023
Type
Girder and Floorbeam System
Steel
Length
40 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Road 23N37 over Eureka Creek is a steel girder and floorbeam system carrying Road 23N37 over Eureka Creek in Plumas County, California. It was built in 1942 and reconstructed in 1988, so it is 83 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 40 ft (12.2 m) long and 13 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesRoad 23N37
CrossesEureka Creek
LocationEureka Creek
RouteFederal Lands Road 23N37
CountyPlumas County
StateCalifornia
Coordinates39.80035, -120.68807
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation*: *
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating—
Inventory rating—

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width13 ft (4.1 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 23N37 over Eureka Creek built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1988.

What condition is Road 23N37 over Eureka Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Road 23N37 over Eureka Creek carry?

About 50 vehicles per day (latest count).

How long is Road 23N37 over Eureka Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 13 ft wide.

Who owns Road 23N37 over Eureka Creek?

It is owned by the U.S. Forest Service.