US Bridges

Beckwourth Grnvle over Lights Crk (deadfall Br)

Fair

Plumas County, California · Jnct Diamond Mtn RD · Structure no. 09C0012

Built
1947
78 years old
Condition
Fair
inspected September 2023
Type
Truss - Thru
Steel
Length
105 ft
1 main span
Daily traffic
345
2019 count
Owner
County
County Highway Agency

About this bridge

Beckwourth Grnvle over Lights Crk (deadfall Br) is a steel truss - thru carrying Beckwourth Grnvle over Lights Crk (deadfall Br) in Plumas County, California. It was built in 1947, so it is 78 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 345 vehicles a day, roughly 6% of them trucks, projected to reach 923 by 2044. The structure is 105 ft (32 m) long and 27 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesBeckwourth Grnvle
CrossesLights Crk (deadfall Br)
LocationJnct Diamond Mtn RD
RouteCounty Highway 0
CountyPlumas County
StateCalifornia
Coordinates40.1007, -120.83946
Functional classRural Minor Collector

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length105 ft (32 m)
Longest span100 ft (30.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic345 (2019)
Projected traffic923 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-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 Beckwourth Grnvle over Lights Crk (deadfall Br) built?

It was built in 1947, making it 78 years old in 2025.

What condition is Beckwourth Grnvle over Lights Crk (deadfall Br) 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 Beckwourth Grnvle over Lights Crk (deadfall Br) carry?

About 345 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is Beckwourth Grnvle over Lights Crk (deadfall Br)?

The structure is 105 ft (32 m) long with a longest span of 100 ft (30.5 m) and a deck 27 ft wide.

Who owns Beckwourth Grnvle over Lights Crk (deadfall Br)?

It is owned by the County Highway Agency.