US Bridges

SR-71 over Big Cottonwood Creek

FairPosted for load

Salt Lake County, Utah · 900 E and Van Winkle · Structure no. 0E1227

Built
1964
61 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
26,495
2014 count
Owner
State
State Highway Agency

About this bridge

SR-71 over Big Cottonwood Creek is a concrete continuous culvert carrying SR-71 over Big Cottonwood Creek in Salt Lake County, Utah. It was built in 1964, so it is 61 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 26,495 vehicles a day, roughly 17% of them trucks, projected to reach 33,119 by 2034. The structure is 33 ft (10.1 m) long and 104 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR-71
CrossesBig Cottonwood Creek
Location900 E and Van Winkle
RouteState Highway 71
CountySalt Lake County
StateUtah
Coordinates40.66636, -111.86736
Functional classUrban Other Principal Arterial

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length33 ft (10.1 m)
Longest span16 ft (4.9 m)
Deck width104 ft (31.7 m)
Roadway width104 ft (31.7 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic26,495 (2014)
Projected traffic33,119 by 2034
Trucks17%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 SR-71 over Big Cottonwood Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is SR-71 over Big Cottonwood 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 September 2024.

How much traffic does SR-71 over Big Cottonwood Creek carry?

About 26,495 vehicles per day (2014 count), of which roughly 17% are trucks.

How long is SR-71 over Big Cottonwood Creek?

The structure is 33 ft (10.1 m) long with a longest span of 16 ft (4.9 m) and a deck 104 ft wide.

Who owns SR-71 over Big Cottonwood Creek?

It is owned by the State Highway Agency.