US Bridges

29970 415th Avenue over Trib. to Emanuel Creek

PoorPosted for load

Bon Homme County, South Dakota · 1W & 3.3N of Tyndall · Structure no. 000000005140087

Built
1930
95 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
60
2022 count
Owner
County
County Highway Agency

About this bridge

29970 415th Avenue over Trib. to Emanuel Creek is a steel stringer/multi-beam or girder carrying 29970 415th Avenue over Trib. to Emanuel Creek in Bon Homme County, South Dakota. It was built in 1930, so it is 95 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 3 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 22 ft (6.8 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries29970 415th Avenue
CrossesTrib. to Emanuel Creek
Location1W & 3.3N of Tyndall
Coordinates43.04301, -97.89149
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating3 US tons
Inventory rating3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.8 m)
Longest span21 ft (6.4 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2022)
Projected traffic60 by 2032
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$377,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 29970 415th Avenue over Trib. to Emanuel Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is 29970 415th Avenue over Trib. to 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 July 2024.

How much traffic does 29970 415th Avenue over Trib. to Emanuel Creek carry?

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

How long is 29970 415th Avenue over Trib. to Emanuel Creek?

The structure is 22 ft (6.8 m) long with a longest span of 21 ft (6.4 m) and a deck 16 ft wide.

Who owns 29970 415th Avenue over Trib. to Emanuel Creek?

It is owned by the County Highway Agency.