US Bridges

370 Ave over I090

Fair

Aurora County, South Dakota · Aurora & Brule CO Line · Structure no. 000000002000135

Built
1965
60 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
254 ft
4 main spans
Daily traffic
75
2023 count
Owner
State
State Highway Agency

About this bridge

370 Ave over I090 is a steel continuous stringer/multi-beam or girder carrying 370 Ave over I090 in Aurora 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 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 75 vehicles a day, roughly 3% of them trucks, projected to reach 75 by 2043. The structure is 254 ft (77.4 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries370 Ave
CrossesI090
LocationAurora & Brule CO Line
RouteCounty Highway 0
CountyAurora County
StateSouth Dakota
Coordinates43.73825, -98.79511
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length254 ft (77.4 m)
Longest span70 ft (21.3 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic75 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$1.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 370 Ave over I090 built?

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

What condition is 370 Ave over I090 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 November 2024.

How much traffic does 370 Ave over I090 carry?

About 75 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is 370 Ave over I090?

The structure is 254 ft (77.4 m) long with a longest span of 70 ft (21.3 m) and a deck 26 ft wide.

Who owns 370 Ave over I090?

It is owned by the State Highway Agency.