US Bridges

I-15 (SR-15) Nbl over Harrisburg Creek

Fair

Washington County, Utah · 4.3 Mi.No.Harrisburg Int. · Structure no. 1E1081

Built
1956
69 years old
Condition
Fair
inspected January 2023
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
30,540
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Harrisburg Creek is a concrete continuous culvert carrying I-15 (SR-15) Nbl over Harrisburg Creek in Washington County, Utah. It was built in 1956, so it is 69 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 30,540 vehicles a day, roughly 26% of them trucks, projected to reach 36,648 by 2042. The structure is 37 ft (11.3 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesHarrisburg Creek
Location4.3 Mi.No.Harrisburg Int.
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.20645, -113.39507
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 inspectionJanuary 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 rating54.7 US tons
Inventory rating30 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length37 ft (11.3 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic30,540 (2022)
Projected traffic36,648 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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) Nbl over Harrisburg Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is I-15 (SR-15) Nbl over Harrisburg Creek 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 January 2023.

How much traffic does I-15 (SR-15) Nbl over Harrisburg Creek carry?

About 30,540 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Nbl over Harrisburg Creek?

The structure is 37 ft (11.3 m) long with a longest span of 18 ft (5.5 m).

Who owns I-15 (SR-15) Nbl over Harrisburg Creek?

It is owned by the State Highway Agency.