US Bridges

397 Ave (fas 6219) over I090

Good

Davison County, South Dakota · Mt Vernon Interchange · Structure no. 000000018030105

Built
1965
60 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
252 ft
4 main spans
Daily traffic
672
2023 count
Owner
State
State Highway Agency

About this bridge

397 Ave (fas 6219) over I090 is a steel continuous stringer/multi-beam or girder carrying 397 Ave (fas 6219) over I090 in Davison County, South Dakota. It was built in 1965, so it is 60 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 672 vehicles a day, roughly 3% of them trucks, projected to reach 672 by 2043. The structure is 252 ft (76.8 m) long and 34 ft wide.

Carries397 Ave (fas 6219)
CrossesI090
LocationMt Vernon Interchange
RouteCounty Highway 0
Coordinates43.69576, -98.26565
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.8 US tons
Inventory rating31 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length252 ft (76.8 m)
Longest span70 ft (21.3 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic672 (2023)
Projected traffic672 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$155,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was 397 Ave (fas 6219) over I090 built?

It was built in 1965, making it 60 years old in 2025.

What condition is 397 Ave (fas 6219) over I090 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does 397 Ave (fas 6219) over I090 carry?

About 672 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is 397 Ave (fas 6219) over I090?

The structure is 252 ft (76.8 m) long with a longest span of 70 ft (21.3 m) and a deck 34 ft wide.

Who owns 397 Ave (fas 6219) over I090?

It is owned by the State Highway Agency.