US Bridges

Winding Road over N Fork Tuolumne River

Fair

Tuolumne County, California · No Data Entered · Structure no. 051651000001010

Built
1981
44 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
141 ft
3 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Winding Road over N Fork Tuolumne River is a concrete continuous box beam or girders - multiple carrying Winding Road over N Fork Tuolumne River in Tuolumne County, California. It was built in 1981, so it is 44 years old, younger 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 141 ft (42.9 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesWinding Road
CrossesN Fork Tuolumne River
LocationNo Data Entered
RouteCounty Highway 3N01
CountyTuolumne County
StateCalifornia
Coordinates38.09773, -120.10712
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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating21.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length141 ft (42.9 m)
Longest span50 ft (15.2 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-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 Winding Road over N Fork Tuolumne River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Winding Road over N Fork Tuolumne 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 September 2023.

How much traffic does Winding Road over N Fork Tuolumne River carry?

About 50 vehicles per day (latest count).

How long is Winding Road over N Fork Tuolumne River?

The structure is 141 ft (42.9 m) long with a longest span of 50 ft (15.2 m) and a deck 31 ft wide.

Who owns Winding Road over N Fork Tuolumne River?

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