US Bridges

SR-128 over Onion Creek

Fair

Grand County, Utah · 23 Miles N. of Moab · Structure no. 0E2248

Built
1985
40 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
42 ft
2 main spans
Daily traffic
364
2017 count
Owner
State
State Highway Agency

About this bridge

SR-128 over Onion Creek is a concrete culvert carrying SR-128 over Onion Creek in Grand County, Utah. It was built in 1985, so it is 40 years old, younger 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 364 vehicles a day, roughly 25% of them trucks, projected to reach 437 by 2037. The structure is 42 ft (12.8 m) long and 50 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-128
CrossesOnion Creek
Location23 Miles N. of Moab
RouteState Highway 128
CountyGrand County
StateUtah
Coordinates38.72878, -109.34875
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span20 ft (6 m)
Deck width50 ft (15.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic364 (2017)
Projected traffic437 by 2037
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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-128 over Onion Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is SR-128 over Onion 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 2023.

How much traffic does SR-128 over Onion Creek carry?

About 364 vehicles per day (2017 count), of which roughly 25% are trucks.

How long is SR-128 over Onion Creek?

The structure is 42 ft (12.8 m) long with a longest span of 20 ft (6 m) and a deck 50 ft wide.

Who owns SR-128 over Onion Creek?

It is owned by the State Highway Agency.