US Bridges

SR-121 over Cottonwood Creek

FairPosted for load

Duchesne County, Utah · 1.6 Mile No. of Roosevelt · Structure no. 0D 525

Built
1950
75 years old
Condition
Fair
inspected July 2023
Type
Frame
Concrete
Length
47 ft
1 main span
Daily traffic
6,125
2017 count
Owner
State
State Highway Agency

About this bridge

SR-121 over Cottonwood Creek is a concrete frame carrying SR-121 over Cottonwood Creek in Duchesne County, Utah. It was built in 1950, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 6,125 vehicles a day, roughly 37% of them trucks, projected to reach 7,350 by 2037. The structure is 47 ft (14.3 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSR-121
CrossesCottonwood Creek
Location1.6 Mile No. of Roosevelt
RouteState Highway 121
CountyDuchesne County
StateUtah
Coordinates40.31389, -110.01194
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating13.2 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length47 ft (14.3 m)
Longest span40 ft (12.2 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,125 (2017)
Projected traffic7,350 by 2037
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

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-121 over Cottonwood Creek built?

It was built in 1950, making it 75 years old in 2025.

What condition is SR-121 over 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 July 2023.

How much traffic does SR-121 over Cottonwood Creek carry?

About 6,125 vehicles per day (2017 count), of which roughly 37% are trucks.

How long is SR-121 over Cottonwood Creek?

The structure is 47 ft (14.3 m) long with a longest span of 40 ft (12.2 m) and a deck 32 ft wide.

Who owns SR-121 over Cottonwood Creek?

It is owned by the State Highway Agency.