US Bridges

IRR County RD over I029

Fair

Roberts County, South Dakota · 4 N Sd 15 Interch · Structure no. 000000055115330

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
292 ft
2 main spans
Daily traffic
68
2023 count
Owner
State
State Highway Agency

About this bridge

IRR County RD over I029 is a steel continuous stringer/multi-beam or girder carrying IRR County RD over I029 in Roberts County, South Dakota. It was built in 1978, so it is 47 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 68 vehicles a day, roughly 3% of them trucks, projected to reach 68 by 2043. The structure is 292 ft (89.1 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIRR County RD
CrossesI029
Location4 N Sd 15 Interch
RouteCounty Highway 0
CountyRoberts County
StateSouth Dakota
Coordinates45.45661, -96.98884
Functional classRural Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.6 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length292 ft (89.1 m)
Longest span112 ft (34.1 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68 (2023)
Projected traffic68 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
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 IRR County RD over I029 built?

It was built in 1978, making it 47 years old in 2025.

What condition is IRR County RD 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 May 2023.

How much traffic does IRR County RD over I029 carry?

About 68 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR County RD over I029?

The structure is 292 ft (89.1 m) long with a longest span of 112 ft (34.1 m) and a deck 35 ft wide.

Who owns IRR County RD over I029?

It is owned by the State Highway Agency.