US Bridges

291 ST (fas 6102) over I029

Fair

Lincoln County, South Dakota · 6 N Sd 46 Interchange · Structure no. 000000042065230

Built
1961
64 years old
Condition
Fair
inspected March 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
254 ft
4 main spans
Daily traffic
256
2023 count
Owner
State
State Highway Agency

About this bridge

291 ST (fas 6102) over I029 is a steel continuous stringer/multi-beam or girder carrying 291 ST (fas 6102) over I029 in Lincoln County, South Dakota. It was built in 1961, so it is 64 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 256 vehicles a day, roughly 3% of them trucks, projected to reach 256 by 2043. The structure is 254 ft (77.4 m) long and 32 ft wide.

Location

Open in Google Maps
Carries291 ST (fas 6102)
CrossesI029
Location6 N Sd 46 Interchange
RouteCounty Highway 0
CountyLincoln County
StateSouth Dakota
Coordinates43.17071, -96.79518
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
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.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.4 US tons
Inventory rating27.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span70 ft (21.3 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic256 (2023)
Projected traffic256 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 291 ST (fas 6102) over I029 built?

It was built in 1961, making it 64 years old in 2025.

What condition is 291 ST (fas 6102) over I029 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 March 2025.

How much traffic does 291 ST (fas 6102) over I029 carry?

About 256 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is 291 ST (fas 6102) over I029?

The structure is 254 ft (77.4 m) long with a longest span of 70 ft (21.3 m) and a deck 32 ft wide.

Who owns 291 ST (fas 6102) over I029?

It is owned by the State Highway Agency.