US Bridges

SR-13 over Malad River

Fair

Box Elder County, Utah · South of Plymouth · Structure no. 0D 345

Built
1933
92 years old, rebuilt 1984
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
65 ft
3 main spans
Daily traffic
1,318
2021 count
Owner
State
State Highway Agency

About this bridge

SR-13 over Malad River is a concrete continuous tee beam carrying SR-13 over Malad River in Box Elder County, Utah. It was built in 1933 and reconstructed in 1984, so it is 92 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 1,318 vehicles a day, roughly 31% of them trucks, projected to reach 1,582 by 2041. The structure is 65 ft (19.8 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-13
CrossesMalad River
LocationSouth of Plymouth
RouteState Highway 13
CountyBox Elder County
StateUtah
Coordinates41.83833, -112.14722
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating40.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length65 ft (19.8 m)
Longest span65 ft (19.8 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,318 (2021)
Projected traffic1,582 by 2041
Trucks31%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-13 over Malad River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1984.

What condition is SR-13 over Malad River 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-13 over Malad River carry?

About 1,318 vehicles per day (2021 count), of which roughly 31% are trucks.

How long is SR-13 over Malad River?

The structure is 65 ft (19.8 m) long with a longest span of 65 ft (19.8 m) and a deck 44 ft wide.

Who owns SR-13 over Malad River?

It is owned by the State Highway Agency.