US Bridges

Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl

Fair

Box Elder County, Utah · Forest St.Int.W. Brigham · Structure no. 0F 584

Built
1995
30 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
259 ft
2 main spans
Daily traffic
6,075
2022 count
Owner
State
State Highway Agency

About this bridge

Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl is a prestressed concrete continuous stringer/multi-beam or girder carrying Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl in Box Elder County, Utah. It was built in 1995, so it is 30 years old, younger 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 6,075 vehicles a day, roughly 18% of them trucks, projected to reach 7,290 by 2042. The structure is 259 ft (78.8 m) long and 61 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesForest St.Int.X-Rd
CrossesI-15 (SR-15) Nbl and Sbl
LocationForest St.Int.W. Brigham
RouteCounty Highway 1082
CountyBox Elder County
StateUtah
Coordinates41.50986, -112.06075
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 rating99.3 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length259 ft (78.8 m)
Longest span128 ft (39 m)
Deck width61 ft (18.7 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,075 (2022)
Projected traffic7,290 by 2042
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed5 mi (8 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 Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl built?

It was built in 1995, making it 30 years old in 2025.

What condition is Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl 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 May 2023.

How much traffic does Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl carry?

About 6,075 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl?

The structure is 259 ft (78.8 m) long with a longest span of 128 ft (39 m) and a deck 61 ft wide.

Who owns Forest St.Int.X-Rd over I-15 (SR-15) Nbl and Sbl?

It is owned by the State Highway Agency.