US Bridges

SR 108 over Sierra RR Sanguinetti RD

Fair

Tuolumne County, California · 10-TUO-108-R2.02-SRA · Structure no. 32 0062S

Built
2004
21 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
170 ft
2 main spans
Daily traffic
2,500
2004 count
Owner
State
State Highway Agency

About this bridge

SR 108 over Sierra RR Sanguinetti RD is a prestressed concrete continuous box beam or girders - multiple carrying SR 108 over Sierra RR Sanguinetti RD in Tuolumne County, California. It was built in 2004, so it is 21 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 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 2,500 vehicles a day, roughly 1% of them trucks, projected to reach 3,753 by 2041. The structure is 170 ft (51.7 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSR 108
CrossesSierra RR Sanguinetti RD
Location10-TUO-108-R2.02-SRA
RouteState Highway 108
CountyTuolumne County
StateCalifornia
Coordinates37.974, -120.36019
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length170 ft (51.7 m)
Longest span98 ft (30 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2004)
Projected traffic3,753 by 2041
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 108 over Sierra RR Sanguinetti RD built?

It was built in 2004, making it 21 years old in 2025.

What condition is SR 108 over Sierra RR Sanguinetti RD 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 SR 108 over Sierra RR Sanguinetti RD carry?

About 2,500 vehicles per day (2004 count), of which roughly 1% are trucks.

How long is SR 108 over Sierra RR Sanguinetti RD?

The structure is 170 ft (51.7 m) long with a longest span of 98 ft (30 m) and a deck 27 ft wide.

Who owns SR 108 over Sierra RR Sanguinetti RD?

It is owned by the State Highway Agency.