US Bridges

I090 W over 173 Ave (fas 6110)

Fair

Pennington County, South Dakota · 8 W Wasta Interchange · Structure no. 000000052730285

Built
1961
64 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
158 ft
3 main spans
Daily traffic
4,790
2024 count
Owner
State
State Highway Agency

About this bridge

I090 W over 173 Ave (fas 6110) is a concrete continuous slab carrying I090 W over 173 Ave (fas 6110) in Pennington 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 4,790 vehicles a day, roughly 26% of them trucks, projected to reach 6,720 by 2044. The structure is 158 ft (48.2 m) long and 34 ft wide.

Location

Open in Google Maps
CarriesI090 W
Crosses173 Ave (fas 6110)
Location8 W Wasta Interchange
RouteInterstate 90
CountyPennington County
StateSouth Dakota
Coordinates44.1035, -102.58817
Functional classRural 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating42.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length158 ft (48.2 m)
Longest span55 ft (16.8 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,790 (2024)
Projected traffic6,720 by 2044
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$780,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I090 W over 173 Ave (fas 6110) built?

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

What condition is I090 W over 173 Ave (fas 6110) 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 July 2023.

How much traffic does I090 W over 173 Ave (fas 6110) carry?

About 4,790 vehicles per day (2024 count), of which roughly 26% are trucks.

How long is I090 W over 173 Ave (fas 6110)?

The structure is 158 ft (48.2 m) long with a longest span of 55 ft (16.8 m) and a deck 34 ft wide.

Who owns I090 W over 173 Ave (fas 6110)?

It is owned by the State Highway Agency.