US Bridges

Walnut Street over Marne Creek

Good

Yankton County, South Dakota · Walnut Street - Yankton · Structure no. 000000068122204

Built
1999
26 years old
Condition
Good
inspected September 2024
Type
Frame
Concrete Continuous
Length
55 ft
1 main span
Daily traffic
2,700
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Walnut Street over Marne Creek is a concrete continuous frame carrying Walnut Street over Marne Creek in Yankton County, South Dakota. It was built in 1999, so it is 26 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,700 vehicles a day, roughly 1% of them trucks, projected to reach 2,700 by 2032. The structure is 55 ft (16.7 m) long and 57 ft wide.

CarriesWalnut Street
CrossesMarne Creek
LocationWalnut Street - Yankton
RouteCity Street 0
Coordinates42.8742, -97.39369
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.6 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length55 ft (16.7 m)
Longest span52 ft (16 m)
Deck width57 ft (17.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2022)
Projected traffic2,700 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$1.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Walnut Street over Marne Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Walnut Street over Marne Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Walnut Street over Marne Creek carry?

About 2,700 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Walnut Street over Marne Creek?

The structure is 55 ft (16.7 m) long with a longest span of 52 ft (16 m) and a deck 57 ft wide.

Who owns Walnut Street over Marne Creek?

It is owned by the City or Municipal Highway Agency.