US Bridges

I090 Wf over R&w RR

PoorPosted for load

Lyman County, South Dakota · 0.7 W Oacoma Interch · Structure no. 000000043479269

Built
1953
72 years old
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
249 ft
4 main spans
Daily traffic
2,622
2023 count
Owner
State
State Highway Agency

About this bridge

I090 Wf over R&w RR is a steel stringer/multi-beam or girder carrying I090 Wf over R&w RR in Lyman County, South Dakota. It was built in 1953, so it is 72 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,622 vehicles a day, roughly 1% of them trucks, projected to reach 2,622 by 2043. The structure is 249 ft (76 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesI090 Wf
CrossesR&w RR
Location0.7 W Oacoma Interch
RouteInterstate 90
CountyLyman County
StateSouth Dakota
Coordinates43.8047, -99.40624
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating22.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length249 ft (76 m)
Longest span69 ft (21 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,622 (2023)
Projected traffic2,622 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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 I090 Wf over R&w RR built?

It was built in 1953, making it 72 years old in 2025.

What condition is I090 Wf over R&w RR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does I090 Wf over R&w RR carry?

About 2,622 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is I090 Wf over R&w RR?

The structure is 249 ft (76 m) long with a longest span of 69 ft (21 m) and a deck 32 ft wide.

Who owns I090 Wf over R&w RR?

It is owned by the State Highway Agency.