US Bridges

Co.Rd.-Big Fields over I-15 (SR-15) Nbl and Sbl

Fair

Iron County, Utah · 2.1 Mi.No.No.Parowan Int. · Structure no. 0P 2

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
327 ft
2 main spans
Daily traffic
119
2023 count
Owner
State
State Highway Agency

About this bridge

Co.Rd.-Big Fields over I-15 (SR-15) Nbl and Sbl is a concrete continuous box beam or girders - multiple carrying Co.Rd.-Big Fields over I-15 (SR-15) Nbl and Sbl in Iron County, Utah. It was built in 1973, so it is 52 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 119 vehicles a day, projected to reach 143 by 2043. The structure is 327 ft (99.6 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCo.Rd.-Big Fields
CrossesI-15 (SR-15) Nbl and Sbl
Location2.1 Mi.No.No.Parowan Int.
RouteCounty Highway 1796
CountyIron County
StateUtah
Coordinates37.8825, -112.80444
Functional classRural Minor 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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating27.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length327 ft (99.6 m)
Longest span159 ft (48.6 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic119 (2023)
Projected traffic143 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 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.-Big Fields over I-15 (SR-15) Nbl and Sbl built?

It was built in 1973, making it 52 years old in 2025.

What condition is Co.Rd.-Big Fields 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.-Big Fields over I-15 (SR-15) Nbl and Sbl carry?

About 119 vehicles per day (2023 count).

How long is Co.Rd.-Big Fields over I-15 (SR-15) Nbl and Sbl?

The structure is 327 ft (99.6 m) long with a longest span of 159 ft (48.6 m) and a deck 34 ft wide.

Who owns Co.Rd.-Big Fields over I-15 (SR-15) Nbl and Sbl?

It is owned by the State Highway Agency.