US Bridges

I-15 (SR-15) over Mill Creek

Fair

Salt Lake County, Utah · Approx. 3000 So. on I-15 · Structure no. 0E1200

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
236,900
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) over Mill Creek is a concrete culvert carrying I-15 (SR-15) over Mill Creek in Salt Lake County, Utah. It was built in 1959, so it is 66 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 236,900 vehicles a day, roughly 19% of them trucks, projected to reach 296,125 by 2034. The structure is 30 ft (9 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-15 (SR-15)
CrossesMill Creek
LocationApprox. 3000 So. on I-15
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.70625, -111.90361
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length30 ft (9 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic236,900 (2014)
Projected traffic296,125 by 2034
Trucks19%
Lanes on structure13
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$908,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-15 (SR-15) over Mill Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is I-15 (SR-15) over Mill 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 July 2024.

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

About 236,900 vehicles per day (2014 count), of which roughly 19% are trucks.

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

The structure is 30 ft (9 m) long with a longest span of 18 ft (5.5 m).

Who owns I-15 (SR-15) over Mill Creek?

It is owned by the State Highway Agency.