US Bridges

US018 E over Cheyenne Rv

Fair

Fall River County, South Dakota · 1 S JCT Sd 79 · Structure no. 000000024329064

Built
1958
67 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
794 ft
7 main spans
Daily traffic
1,118
2024 count
Owner
State
State Highway Agency

About this bridge

US018 E over Cheyenne Rv is a steel continuous stringer/multi-beam or girder carrying US018 E over Cheyenne Rv in Fall River County, South Dakota. It was built in 1958, so it is 67 years old, older than the South Dakota average of 48.9 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.

It carries about 1,118 vehicles a day, roughly 7% of them trucks, projected to reach 1,661 by 2044. The structure is 794 ft (242 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS018 E
CrossesCheyenne Rv
Location1 S JCT Sd 79
RouteU.S. Route 18
CountyFall River County
StateSouth Dakota
Coordinates43.38374, -103.40438
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.5 US tons
Inventory rating32.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadH 20
Structure length794 ft (242 m)
Longest span120 ft (36.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,118 (2024)
Projected traffic1,661 by 2044
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US018 E over Cheyenne Rv built?

It was built in 1958, making it 67 years old in 2025.

What condition is US018 E over Cheyenne Rv 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 January 2025.

How much traffic does US018 E over Cheyenne Rv carry?

About 1,118 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is US018 E over Cheyenne Rv?

The structure is 794 ft (242 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.

Who owns US018 E over Cheyenne Rv?

It is owned by the State Highway Agency.