US Bridges

305th Street over Emanuel Creek

PoorPosted for load

Bon Homme County, South Dakota · 1S & 2.8W of Tyndall · Structure no. 000000005122140

Built
1970
55 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
3 main spans
Daily traffic
60
2022 count
Owner
County
County Highway Agency

About this bridge

305th Street over Emanuel Creek is a steel stringer/multi-beam or girder carrying 305th Street over Emanuel Creek in Bon Homme County, South Dakota. It was built in 1970, so it is 55 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 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 60 vehicles a day, roughly 2% of them trucks, projected to reach 60 by 2032. The structure is 95 ft (29.1 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Carries305th Street
CrossesEmanuel Creek
Location1S & 2.8W of Tyndall
Coordinates42.9666, -97.92778
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.4 US tons
Inventory rating23 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans3
Design loadUnknown
Structure length95 ft (29.1 m)
Longest span31 ft (9.5 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2022)
Projected traffic60 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 305th Street over Emanuel Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is 305th Street over Emanuel Creek 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 May 2023.

How much traffic does 305th Street over Emanuel Creek carry?

About 60 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 305th Street over Emanuel Creek?

The structure is 95 ft (29.1 m) long with a longest span of 31 ft (9.5 m) and a deck 30 ft wide.

Who owns 305th Street over Emanuel Creek?

It is owned by the County Highway Agency.