US Bridges

I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch.

Fair

Millard County, Utah · 0.4 Mi.So.No.Fillmore Int · Structure no. 0E1800

Built
1972
53 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete Continuous
Length
37 ft
2 main spans
Daily traffic
24,744
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch. is a concrete continuous culvert carrying I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch. in Millard County, Utah. It was built in 1972, so it is 53 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 24,744 vehicles a day, roughly 32% of them trucks, projected to reach 29,693 by 2042. The structure is 37 ft (11.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-15 (SR-15)NB&SB
CrossesChalk Creek Overflow Ch.
Location0.4 Mi.So.No.Fillmore Int
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates38.98704, -112.32912
Functional classRural 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating42.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length37 ft (11.4 m)
Longest span17 ft (5.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,744 (2022)
Projected traffic29,693 by 2042
Trucks32%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Chalk Creek Overflow Ch. built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch. 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 February 2023.

How much traffic does I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch. carry?

About 24,744 vehicles per day (2022 count), of which roughly 32% are trucks.

How long is I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch.?

The structure is 37 ft (11.4 m) long with a longest span of 17 ft (5.3 m).

Who owns I-15 (SR-15)NB&SB over Chalk Creek Overflow Ch.?

It is owned by the State Highway Agency.