US Bridges

242nd Street over Big Sioux River

PoorPosted for load

Moody County, South Dakota · 2.4S of Trent · Structure no. 000000051120224

Built
1983
42 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
110 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

242nd Street over Big Sioux River is a steel stringer/multi-beam or girder carrying 242nd Street over Big Sioux River in Moody County, South Dakota. It was built in 1983, so it is 42 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, roughly 2% of them trucks, projected to reach 20 by 2032. The structure is 110 ft (33.5 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries242nd Street
CrossesBig Sioux River
Location2.4S of Trent
RouteCounty Highway 0
Coordinates43.87046, -96.64664
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating24.3 US tons
Inventory rating18.2 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length110 ft (33.5 m)
Longest span54 ft (16.5 m)
Deck width22 ft (6.7 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$2.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 242nd Street over Big Sioux River built?

It was built in 1983, making it 42 years old in 2025.

What condition is 242nd Street over Big Sioux 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 August 2024.

How much traffic does 242nd Street over Big Sioux River carry?

About 20 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 242nd Street over Big Sioux River?

The structure is 110 ft (33.5 m) long with a longest span of 54 ft (16.5 m) and a deck 22 ft wide.

Who owns 242nd Street over Big Sioux River?

It is owned by the County Highway Agency.