US Bridges

SR-13 over I-15 (SR-15) Nbl & S

Fair

Box Elder County, Utah · At the Elwood Intchg. · Structure no. 0F 178

Built
1972
53 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
294 ft
4 main spans
Daily traffic
1,731
2021 count
Owner
State
State Highway Agency

About this bridge

SR-13 over I-15 (SR-15) Nbl & S is a prestressed concrete stringer/multi-beam or girder carrying SR-13 over I-15 (SR-15) Nbl & S in Box Elder County, Utah. It was built in 1972, so it is 53 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 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 1,731 vehicles a day, roughly 42% of them trucks, projected to reach 2,077 by 2041. The structure is 294 ft (89.6 m) long and 54 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR-13
CrossesI-15 (SR-15) Nbl & S
LocationAt the Elwood Intchg.
RouteState Highway 13
CountyBox Elder County
StateUtah
Coordinates41.67944, -112.14111
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length294 ft (89.6 m)
Longest span106 ft (32.2 m)
Deck width54 ft (16.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,731 (2021)
Projected traffic2,077 by 2041
Trucks42%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 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-13 over I-15 (SR-15) Nbl & S built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR-13 over I-15 (SR-15) Nbl & S 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 I-15 (SR-15) Nbl & S carry?

About 1,731 vehicles per day (2021 count), of which roughly 42% are trucks.

How long is SR-13 over I-15 (SR-15) Nbl & S?

The structure is 294 ft (89.6 m) long with a longest span of 106 ft (32.2 m) and a deck 54 ft wide.

Who owns SR-13 over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.