US Bridges

Dyson Lane over Mid Fk Feather Riv Ovrfl

FairPosted for load

Plumas County, California · 2.4 MI E Bckwrth-Calpn RD · Structure no. 09C0001

Built
1908
117 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
285 ft
1 main span
Daily traffic
40
2019 count
Owner
County
County Highway Agency

About this bridge

Dyson Lane over Mid Fk Feather Riv Ovrfl is a steel truss - thru carrying Dyson Lane over Mid Fk Feather Riv Ovrfl in Plumas County, California. It was built in 1908, so it is 117 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 79 by 2044. The structure is 285 ft (86.9 m) long and 14 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesDyson Lane
CrossesMid Fk Feather Riv Ovrfl
Location2.4 MI E Bckwrth-Calpn RD
RouteCounty Highway 0
Coordinates39.76278, -120.33698
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.5 US tons
Inventory rating7.5 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+3 approach)
Design loadUnknown
Structure length285 ft (86.9 m)
Longest span100 ft (30.5 m)
Deck width14 ft (4.2 m)
Roadway width12 ft (3.8 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic40 (2019)
Projected traffic79 by 2044
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dyson Lane over Mid Fk Feather Riv Ovrfl built?

It was built in 1908, making it 117 years old in 2025.

What condition is Dyson Lane over Mid Fk Feather Riv Ovrfl 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 2024.

How much traffic does Dyson Lane over Mid Fk Feather Riv Ovrfl carry?

About 40 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Dyson Lane over Mid Fk Feather Riv Ovrfl?

The structure is 285 ft (86.9 m) long with a longest span of 100 ft (30.5 m) and a deck 14 ft wide.

Who owns Dyson Lane over Mid Fk Feather Riv Ovrfl?

It is owned by the County Highway Agency.