US Bridges

SR 108 over Mono Way

Fair

Tuolumne County, California · 10-TUO-108-4.90 · Structure no. 32 0071

Built
2013
12 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
744 ft
4 main spans
Daily traffic
20,800
2009 count
Owner
State
State Highway Agency

About this bridge

SR 108 over Mono Way is a prestressed concrete continuous box beam or girders - multiple carrying SR 108 over Mono Way in Tuolumne County, California. It was built in 2013, so it is 12 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 20,800 vehicles a day, projected to reach 38,036 by 2045. The structure is 744 ft (226.7 m) long and 47 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 108
CrossesMono Way
Location10-TUO-108-4.90
RouteState Highway 108
CountyTuolumne County
StateCalifornia
Coordinates37.98176, -120.30697
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length744 ft (226.7 m)
Longest span215 ft (65.4 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,800 (2009)
Projected traffic38,036 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Mono Way built?

It was built in 2013, making it 12 years old in 2025.

What condition is SR 108 over Mono Way 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 Mono Way carry?

About 20,800 vehicles per day (2009 count).

How long is SR 108 over Mono Way?

The structure is 744 ft (226.7 m) long with a longest span of 215 ft (65.4 m) and a deck 47 ft wide.

Who owns SR 108 over Mono Way?

It is owned by the State Highway Agency.