US Bridges

SR-120 over Richfield Canal

Fair

Sevier County, Utah · South Main in Richfield · Structure no. 0E1047

Built
1956
69 years old, rebuilt 1997
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
40 ft
1 main span
Daily traffic
18,004
2017 count
Owner
State
State Highway Agency

About this bridge

SR-120 over Richfield Canal is a concrete culvert carrying SR-120 over Richfield Canal in Sevier County, Utah. It was built in 1956 and reconstructed in 1997, so it is 69 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 18,004 vehicles a day, roughly 23% of them trucks, projected to reach 21,605 by 2037. The structure is 40 ft (12.1 m) long and 159 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR-120
CrossesRichfield Canal
LocationSouth Main in Richfield
RouteState Highway 120
CountySevier County
StateUtah
Coordinates38.75972, -112.08472
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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length40 ft (12.1 m)
Longest span38 ft (11.6 m)
Deck width159 ft (48.4 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,004 (2017)
Projected traffic21,605 by 2037
Trucks23%
Lanes on structure4
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-120 over Richfield Canal built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1997.

What condition is SR-120 over Richfield Canal 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 May 2023.

How much traffic does SR-120 over Richfield Canal carry?

About 18,004 vehicles per day (2017 count), of which roughly 23% are trucks.

How long is SR-120 over Richfield Canal?

The structure is 40 ft (12.1 m) long with a longest span of 38 ft (11.6 m) and a deck 159 ft wide.

Who owns SR-120 over Richfield Canal?

It is owned by the State Highway Agency.