US Bridges

Road 23N37 over Jamison Creek

Fair

Plumas County, California · Jamison Creek · Structure no. 051151000001015

Built
1952
73 years old
Condition
Fair
inspected September 2023
Type
Girder and Floorbeam System
Steel
Length
91 ft
2 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Road 23N37 over Jamison Creek is a steel girder and floorbeam system carrying Road 23N37 over Jamison Creek in Plumas County, California. It was built in 1952, so it is 73 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 6 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, projected to reach 75 by 2045. The structure is 91 ft (27.7 m) long and 14 ft wide.

Location

Open in Google Maps
CarriesRoad 23N37
CrossesJamison Creek
LocationJamison Creek
RouteFederal Lands Road 23N37
CountyPlumas County
StateCalifornia
Coordinates39.80126, -120.68016
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span50 ft (15.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 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 closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road 23N37 over Jamison Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is Road 23N37 over Jamison 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 2023.

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

About 50 vehicles per day (latest count).

How long is Road 23N37 over Jamison Creek?

The structure is 91 ft (27.7 m) long with a longest span of 50 ft (15.2 m) and a deck 14 ft wide.

Who owns Road 23N37 over Jamison Creek?

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