US Bridges

Tioga Road over Tuolumne River

Fair

Tuolumne County, California · 7.0 Miles E from El Porta · Structure no. 8800023P0000000

Built
1934
91 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
87 ft
3 main spans
Daily traffic
2,041
2022 count
Owner
Federal
National Park Service

About this bridge

Tioga Road over Tuolumne River is a concrete tee beam carrying Tioga Road over Tuolumne River in Tuolumne County, California. It was built in 1934, so it is 91 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 2,041 vehicles a day, roughly 1% of them trucks, projected to reach 2,449 by 2042. The structure is 87 ft (26.5 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesTioga Road
CrossesTuolumne River
Location7.0 Miles E from El Porta
RouteFederal Lands Road 17
CountyTuolumne County
StateCalifornia
Coordinates37.87623, -119.35489
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length87 ft (26.5 m)
Longest span32 ft (9.8 m)
Deck width37 ft (11.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,041 (2022)
Projected traffic2,449 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$340,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tioga Road over Tuolumne River built?

It was built in 1934, making it 91 years old in 2025.

What condition is Tioga Road over 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 2024.

How much traffic does Tioga Road over Tuolumne River carry?

About 2,041 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Tioga Road over Tuolumne River?

The structure is 87 ft (26.5 m) long with a longest span of 32 ft (9.8 m) and a deck 37 ft wide.

Who owns Tioga Road over Tuolumne River?

It is owned by the National Park Service.