US Bridges

SR-137 over Twelve Mile Wash

FairPosted for load

Sanpete County, Utah · North of Mayfield · Structure no. 0A 446

Built
1947
78 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
23 ft
1 main span
Daily traffic
490
2014 count
Owner
State
State Highway Agency

About this bridge

SR-137 over Twelve Mile Wash is a wood or timber stringer/multi-beam or girder carrying SR-137 over Twelve Mile Wash in Sanpete County, Utah. It was built in 1947, so it is 78 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. Its operating status is: posted for load restriction.

It carries about 490 vehicles a day, roughly 27% of them trucks, projected to reach 613 by 2034. The structure is 23 ft (6.9 m) long and 35 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesSR-137
CrossesTwelve Mile Wash
LocationNorth of Mayfield
RouteState Highway 137
CountySanpete County
StateUtah
Coordinates39.12255, -111.71168
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: 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 rating21.4 US tons
Inventory rating10.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length23 ft (6.9 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic490 (2014)
Projected traffic613 by 2034
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-137 over Twelve Mile Wash built?

It was built in 1947, making it 78 years old in 2025.

What condition is SR-137 over Twelve Mile 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 June 2023.

How much traffic does SR-137 over Twelve Mile Wash carry?

About 490 vehicles per day (2014 count), of which roughly 27% are trucks.

How long is SR-137 over Twelve Mile Wash?

The structure is 23 ft (6.9 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns SR-137 over Twelve Mile Wash?

It is owned by the State Highway Agency.