US Bridges

Dunton Road over Shirley Creek

Fair

Stanislaus County, California · 1.6 MI E/O Milton RD · Structure no. 38C0233

Built
1935
90 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
37
2007 count
Owner
County
County Highway Agency

About this bridge

Dunton Road over Shirley Creek is a concrete continuous tee beam carrying Dunton Road over Shirley Creek in Stanislaus County, California. It was built in 1935, so it is 90 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 37 vehicles a day, roughly 30% of them trucks, projected to reach 50 by 2043. The structure is 36 ft (11 m) long and 23 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesDunton Road
CrossesShirley Creek
Location1.6 MI E/O Milton RD
RouteCounty Highway 0
CountyStanislaus County
StateCalifornia
Coordinates37.91557, -120.81463
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length36 ft (11 m)
Longest span17 ft (5.3 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37 (2007)
Projected traffic50 by 2043
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dunton Road over Shirley Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is Dunton Road over Shirley Creek 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 Dunton Road over Shirley Creek carry?

About 37 vehicles per day (2007 count), of which roughly 30% are trucks.

How long is Dunton Road over Shirley Creek?

The structure is 36 ft (11 m) long with a longest span of 17 ft (5.3 m) and a deck 23 ft wide.

Who owns Dunton Road over Shirley Creek?

It is owned by the County Highway Agency.