I090 E over 324 Ave

Fair

Lyman County, South Dakota · 4 W Reliance Interch · Structure no. 000000043340225

Built: 1971; 54 years old
Condition: Fair; inspected January 2023
Type: Slab; Concrete Continuous
Length: 119 ft; 3 main spans
Daily traffic: 3,852; 2024 count
Owner: State; State Highway Agency

About this bridge

I090 E over 324 Ave is a concrete continuous slab carrying I090 E over 324 Ave in Lyman County, South Dakota. It was built in 1971, so it is 54 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 3,852 vehicles a day, roughly 29% of them trucks, projected to reach 5,501 by 2044. The structure is 119 ft (36.3 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps

CarriesI090 E

Crosses324 Ave

Location4 W Reliance Interch

RouteInterstate 90

CountyLyman County

StateSouth Dakota

Coordinates43.86855, -99.68549

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJanuary 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 geometry6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating63.8 US tons

Inventory rating38.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20 + Mod

Structure length119 ft (36.3 m)

Longest span43 ft (13.1 m)

Deck width41 ft (12.4 m)

Roadway width38 ft (11.6 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,852 (2024)

Projected traffic5,501 by 2044

Trucks29%

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 I090 E over 324 Ave built?

It was built in 1971, making it 54 years old in 2025.

What condition is I090 E over 324 Ave 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 January 2023.

How much traffic does I090 E over 324 Ave carry?

About 3,852 vehicles per day (2024 count), of which roughly 29% are trucks.

How long is I090 E over 324 Ave?

The structure is 119 ft (36.3 m) long with a longest span of 43 ft (13.1 m) and a deck 41 ft wide.

Who owns I090 E over 324 Ave?

It is owned by the State Highway Agency.