US Bridges

SR 120 over South Fork Tuolumne Riv

Good

Tuolumne County, California · 10-TUO-120-R53.02 · Structure no. 32 0036

Built
1964
61 years old, rebuilt 1990
Condition
Good
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
3,650
2009 count
Owner
State
State Highway Agency

About this bridge

SR 120 over South Fork Tuolumne Riv is a concrete continuous tee beam carrying SR 120 over South Fork Tuolumne Riv in Tuolumne County, California. It was built in 1964 and reconstructed in 1990, so it is 61 years old, older 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 3,650 vehicles a day, projected to reach 3,249 by 2043. The structure is 103 ft (31.4 m) long and 40 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

CarriesSR 120
CrossesSouth Fork Tuolumne Riv
Location10-TUO-120-R53.02
RouteState Highway 120
Coordinates37.82063, -119.9193
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating26.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length103 ft (31.4 m)
Longest span65 ft (19.8 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,650 (2009)
Projected traffic3,249 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SR 120 over South Fork Tuolumne Riv built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1990.

What condition is SR 120 over South Fork Tuolumne Riv 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 September 2023.

How much traffic does SR 120 over South Fork Tuolumne Riv carry?

About 3,650 vehicles per day (2009 count).

How long is SR 120 over South Fork Tuolumne Riv?

The structure is 103 ft (31.4 m) long with a longest span of 65 ft (19.8 m) and a deck 40 ft wide.

Who owns SR 120 over South Fork Tuolumne Riv?

It is owned by the State Highway Agency.