US Bridges

C 843 over Middle Fk. Yuba River

Fair

Sierra County, California · S18 T19N R13E · Structure no. 051756000001027

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Girder and Floorbeam System
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

C 843 over Middle Fk. Yuba River is a concrete continuous girder and floorbeam system carrying C 843 over Middle Fk. Yuba River in Sierra County, California. It was built in 1965, so it is 60 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 102 ft (31.1 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesC 843
CrossesMiddle Fk. Yuba River
LocationS18 T19N R13E
RouteCounty Highway NEV-0
CountySierra County
StateCalifornia
Coordinates39.50891, -120.55902
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating—
Inventory rating—

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length102 ft (31.1 m)
Longest span34 ft (10.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 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 C 843 over Middle Fk. Yuba River built?

It was built in 1965, making it 60 years old in 2025.

What condition is C 843 over Middle Fk. Yuba River 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 August 2023.

How much traffic does C 843 over Middle Fk. Yuba River carry?

About 50 vehicles per day (latest count).

How long is C 843 over Middle Fk. Yuba River?

The structure is 102 ft (31.1 m) long with a longest span of 34 ft (10.4 m) and a deck 26 ft wide.

Who owns C 843 over Middle Fk. Yuba River?

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