US Bridges

I-15 (SR-15)NB&SB over Coal Cr. Overflow

Fair

Iron County, Utah · 1 Mi. N. of Exit 59 · Structure no. 0E1476

Built
1968
57 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
24,335
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15)NB&SB over Coal Cr. Overflow is a concrete continuous culvert carrying I-15 (SR-15)NB&SB over Coal Cr. Overflow in Iron County, Utah. It was built in 1968, so it is 57 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 24,335 vehicles a day, roughly 44% of them trucks, projected to reach 30,419 by 2034. The structure is 28 ft (8.4 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI-15 (SR-15)NB&SB
CrossesCoal Cr. Overflow
Location1 Mi. N. of Exit 59
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.69361, -113.0775
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating53.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length28 ft (8.4 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic24,335 (2014)
Projected traffic30,419 by 2034
Trucks44%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-15 (SR-15)NB&SB over Coal Cr. Overflow built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-15 (SR-15)NB&SB over Coal Cr. Overflow 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 I-15 (SR-15)NB&SB over Coal Cr. Overflow carry?

About 24,335 vehicles per day (2014 count), of which roughly 44% are trucks.

How long is I-15 (SR-15)NB&SB over Coal Cr. Overflow?

The structure is 28 ft (8.4 m) long with a longest span of 12 ft (3.7 m).

Who owns I-15 (SR-15)NB&SB over Coal Cr. Overflow?

It is owned by the State Highway Agency.