US Bridges

Road 27N26 over Mosquito Creek

Good

Plumas County, California · Caribou Road · Structure no. 051156000001019

Built
1984
41 years old
Condition
Good
inspected December 2023
Type
Girder and Floorbeam System
Steel
Length
34 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Road 27N26 over Mosquito Creek is a steel girder and floorbeam system carrying Road 27N26 over Mosquito Creek in Plumas County, California. It was built in 1984, so it is 41 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 34 ft (10.4 m) long and 14 ft wide.

Location

Open in Google Maps
CarriesRoad 27N26
CrossesMosquito Creek
LocationCaribou Road
RouteFederal Lands Road 27N26
CountyPlumas County
StateCalifornia
Coordinates40.06116, -121.2006
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation*: *
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 alignment7: Better than present minimum criteria
Operating rating—
Inventory rating—

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span34 ft (10.4 m)
Deck width14 ft (4.3 m)
Roadway width12 ft (3.8 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 byPrivate (other than railroad)
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 27N26 over Mosquito Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Road 27N26 over Mosquito Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Road 27N26 over Mosquito Creek carry?

About 50 vehicles per day (latest count).

How long is Road 27N26 over Mosquito Creek?

The structure is 34 ft (10.4 m) long with a longest span of 34 ft (10.4 m) and a deck 14 ft wide.

Who owns Road 27N26 over Mosquito Creek?

It is owned by the U.S. Forest Service and maintained by the Private (other than railroad).