US Bridges

SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl

Fair

Iron County, Utah · Bear Valley Interchange · Structure no. 0C 658

Built
1979
46 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
291 ft
2 main spans
Daily traffic
2,035
2014 count
Owner
State
State Highway Agency

About this bridge

SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl is a steel continuous stringer/multi-beam or girder carrying SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl in Iron County, Utah. It was built in 1979, so it is 46 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 2,035 vehicles a day, roughly 48% of them trucks, projected to reach 2,544 by 2034. The structure is 291 ft (88.7 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-20 Int.X-Road
CrossesI-15 (SR-15) Nbl & Sbl
LocationBear Valley Interchange
RouteState Highway 20
CountyIron County
StateUtah
Coordinates38.07194, -112.68917
Functional classRural Principal Arterial - Other

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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length291 ft (88.7 m)
Longest span144 ft (44 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,035 (2014)
Projected traffic2,544 by 2034
Trucks48%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

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-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl built?

It was built in 1979, making it 46 years old in 2025.

What condition is SR-20 Int.X-Road over I-15 (SR-15) Nbl & 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 March 2023.

How much traffic does SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl carry?

About 2,035 vehicles per day (2014 count), of which roughly 48% are trucks.

How long is SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl?

The structure is 291 ft (88.7 m) long with a longest span of 144 ft (44 m) and a deck 34 ft wide.

Who owns SR-20 Int.X-Road over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.