US Bridges

SR-12 over Big Wash

Fair

Garfield County, Utah · 3.5 Miles East of Tropic · Structure no. 0E1125

Built
1959
66 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
1,686
2022 count
Owner
State
State Highway Agency

About this bridge

SR-12 over Big Wash is a concrete continuous culvert carrying SR-12 over Big Wash in Garfield County, Utah. It was built in 1959, so it is 66 years old, older than the Utah average of 40.1 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 1,686 vehicles a day, roughly 23% of them trucks, projected to reach 2,023 by 2042. The structure is 29 ft (8.7 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-12
CrossesBig Wash
Location3.5 Miles East of Tropic
RouteState Highway 12
CountyGarfield County
StateUtah
Coordinates37.5938, -112.06228
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating23.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length29 ft (8.7 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic1,686 (2022)
Projected traffic2,023 by 2042
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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-12 over Big Wash built?

It was built in 1959, making it 66 years old in 2025.

What condition is SR-12 over Big Wash 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 April 2023.

How much traffic does SR-12 over Big Wash carry?

About 1,686 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is SR-12 over Big Wash?

The structure is 29 ft (8.7 m) long with a longest span of 13 ft (4 m).

Who owns SR-12 over Big Wash?

It is owned by the State Highway Agency.