US Bridges

Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl

Fair

Iron County, Utah · Summit Interchange · Structure no. 0F 239

Built
1970
55 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
201 ft
2 main spans
Daily traffic
2,000
2012 count
Owner
State
State Highway Agency

About this bridge

Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl is a prestressed concrete stringer/multi-beam or girder carrying Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl in Iron County, Utah. It was built in 1970, so it is 55 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 2,000 vehicles a day, projected to reach 2,500 by 2034. The structure is 201 ft (61.3 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCo.Rd.Inter X-Road
CrossesI-15 (SR-15) Nbl and Sbl
LocationSummit Interchange
RouteCounty Highway 1788
CountyIron County
StateUtah
Coordinates37.80278, -112.94694
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating14.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length201 ft (61.3 m)
Longest span98 ft (30 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2012)
Projected traffic2,500 by 2034
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 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 Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl built?

It was built in 1970, making it 55 years old in 2025.

What condition is Co.Rd.Inter X-Road 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 March 2023.

How much traffic does Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl carry?

About 2,000 vehicles per day (2012 count).

How long is Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl?

The structure is 201 ft (61.3 m) long with a longest span of 98 ft (30 m) and a deck 34 ft wide.

Who owns Co.Rd.Inter X-Road over I-15 (SR-15) Nbl and Sbl?

It is owned by the State Highway Agency.