US Bridges

SD037 S over Lake Mitchell Spillway

Fair

Davison County, South Dakota · 2.7 N JCT I 90 Loop · Structure no. 000000018150075

Built
1943
82 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
143 ft
4 main spans
Daily traffic
2,396
2024 count
Owner
State
State Highway Agency

About this bridge

SD037 S over Lake Mitchell Spillway is a concrete stringer/multi-beam or girder carrying SD037 S over Lake Mitchell Spillway in Davison County, South Dakota. It was built in 1943, so it is 82 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 2,396 vehicles a day, roughly 12% of them trucks, projected to reach 3,390 by 2044. The structure is 143 ft (43.7 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesSD037 S
CrossesLake Mitchell Spillway
Location2.7 N JCT I 90 Loop
RouteState Highway 37
CountyDavison County
StateSouth Dakota
Coordinates43.74053, -98.0259
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44 US tons
Inventory rating26.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length143 ft (43.7 m)
Longest span50 ft (15.2 m)
Deck width39 ft (12 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,396 (2024)
Projected traffic3,390 by 2044
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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$775,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SD037 S over Lake Mitchell Spillway built?

It was built in 1943, making it 82 years old in 2025.

What condition is SD037 S over Lake Mitchell Spillway 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 October 2023.

How much traffic does SD037 S over Lake Mitchell Spillway carry?

About 2,396 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is SD037 S over Lake Mitchell Spillway?

The structure is 143 ft (43.7 m) long with a longest span of 50 ft (15.2 m) and a deck 39 ft wide.

Who owns SD037 S over Lake Mitchell Spillway?

It is owned by the State Highway Agency.