US Bridges

I029 S over 271 ST - County RD 106

Fair

Lincoln County, South Dakota · 2.1 S I229 Interchange · Structure no. 000000042064030

Built
2005
20 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
208 ft
1 main span
Daily traffic
23,640
2024 count
Owner
State
State Highway Agency

About this bridge

I029 S over 271 ST - County RD 106 is a steel stringer/multi-beam or girder carrying I029 S over 271 ST - County RD 106 in Lincoln County, South Dakota. It was built in 2005, so it is 20 years old, younger 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 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 23,640 vehicles a day, roughly 20% of them trucks, projected to reach 37,966 by 2044. The structure is 208 ft (63.4 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI029 S
Crosses271 ST - County RD 106
Location2.1 S I229 Interchange
RouteInterstate 29
CountyLincoln County
StateSouth Dakota
Coordinates43.46126, -96.7976
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating52.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length208 ft (63.4 m)
Longest span204 ft (62.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,640 (2024)
Projected traffic37,966 by 2044
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I029 S over 271 ST - County RD 106 built?

It was built in 2005, making it 20 years old in 2025.

What condition is I029 S over 271 ST - County RD 106 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 November 2023.

How much traffic does I029 S over 271 ST - County RD 106 carry?

About 23,640 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is I029 S over 271 ST - County RD 106?

The structure is 208 ft (63.4 m) long with a longest span of 204 ft (62.2 m) and a deck 43 ft wide.

Who owns I029 S over 271 ST - County RD 106?

It is owned by the State Highway Agency.