US Bridges

SD037 over Missouri River

Poor

Bon Homme County, South Dakota · 1.5NE Niobrara · Structure no. 000000005090279

Built
1996
29 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,953 ft
16 main spans
Daily traffic
830
2023 count
Owner
State
State Highway Agency

About this bridge

SD037 over Missouri River is a steel continuous stringer/multi-beam or girder carrying SD037 over Missouri River in Bon Homme County, South Dakota. It was built in 1996, so it is 29 years old, younger than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 830 vehicles a day, roughly 11% of them trucks, projected to reach 1,079 by 2043. The structure is 2,953 ft (900.1 m) long and 38 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSD037
CrossesMissouri River
Location1.5NE Niobrara
RouteState Highway 37
CountyBon Homme County
StateSouth Dakota
Coordinates42.76941, -97.98957
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20 + Mod
Structure length2,953 ft (900.1 m)
Longest span185 ft (56.4 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic830 (2023)
Projected traffic1,079 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SD037 over Missouri River built?

It was built in 1996, making it 29 years old in 2025.

What condition is SD037 over Missouri River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does SD037 over Missouri River carry?

About 830 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SD037 over Missouri River?

The structure is 2,953 ft (900.1 m) long with a longest span of 185 ft (56.4 m) and a deck 38 ft wide.

Who owns SD037 over Missouri River?

It is owned by the State Highway Agency.