US Bridges

SR-21 over Big Wash

FairPosted for load

Beaver County, Utah · 8.2 Mi. W. of Milford · Structure no. 0D 526

Built
1949
76 years old
Condition
Fair
inspected February 2023
Type
Frame
Concrete
Length
48 ft
1 main span
Daily traffic
329
2022 count
Owner
State
State Highway Agency

About this bridge

SR-21 over Big Wash is a concrete frame carrying SR-21 over Big Wash in Beaver County, Utah. It was built in 1949, so it is 76 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 329 vehicles a day, roughly 21% of them trucks, projected to reach 395 by 2042. The structure is 48 ft (14.5 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSR-21
CrossesBig Wash
Location8.2 Mi. W. of Milford
RouteState Highway 21
CountyBeaver County
StateUtah
Coordinates38.43889, -113.15278
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.9 US tons
Inventory rating15 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length48 ft (14.5 m)
Longest span34 ft (10.3 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic329 (2022)
Projected traffic395 by 2042
Trucks21%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR-21 over Big Wash built?

It was built in 1949, making it 76 years old in 2025.

What condition is SR-21 over Big Wash 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 SR-21 over Big Wash carry?

About 329 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is SR-21 over Big Wash?

The structure is 48 ft (14.5 m) long with a longest span of 34 ft (10.3 m) and a deck 29 ft wide.

Who owns SR-21 over Big Wash?

It is owned by the State Highway Agency.