US Bridges

Mono Way over Sullivan Creek

Poor

Tuolumne County, California · 0.5 MI E of HWY 108 · Structure no. 32C0079

Built
1991
34 years old
Condition
Poor
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
120 ft
2 main spans
Daily traffic
25,060
2015 count
Owner
County
County Highway Agency

About this bridge

Mono Way over Sullivan Creek is a concrete continuous tee beam carrying Mono Way over Sullivan Creek in Tuolumne County, California. It was built in 1991, so it is 34 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 25,060 vehicles a day, roughly 5% of them trucks, projected to reach 26,452 by 2043. The structure is 120 ft (36.6 m) long and 79 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMono Way
CrossesSullivan Creek
Location0.5 MI E of HWY 108
RouteCounty Highway 0
CountyTuolumne County
StateCalifornia
Coordinates37.9753, -120.34891
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length120 ft (36.6 m)
Longest span59 ft (18 m)
Deck width79 ft (24.2 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,060 (2015)
Projected traffic26,452 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.5 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mono Way over Sullivan Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Mono Way over Sullivan Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.

How much traffic does Mono Way over Sullivan Creek carry?

About 25,060 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Mono Way over Sullivan Creek?

The structure is 120 ft (36.6 m) long with a longest span of 59 ft (18 m) and a deck 79 ft wide.

Who owns Mono Way over Sullivan Creek?

It is owned by the County Highway Agency.