US Bridges

SD115 over Nine Mile Ck

Good

Lincoln County, South Dakota · 1.5 W & .7 S Harrisburg · Structure no. 000000042100056

Built
2011
14 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
2,701
2024 count
Owner
State
State Highway Agency

About this bridge

SD115 over Nine Mile Ck is a concrete continuous culvert carrying SD115 over Nine Mile Ck in Lincoln County, South Dakota. It was built in 2011, so it is 14 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 2,701 vehicles a day, roughly 1% of them trucks, projected to reach 4,573 by 2044. The structure is 26 ft (8 m) long.

CarriesSD115
CrossesNine Mile Ck
Location1.5 W & .7 S Harrisburg
RouteState Highway 115
Coordinates43.42285, -96.72747
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating38.5 US tons
Inventory rating29.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length26 ft (8 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,701 (2024)
Projected traffic4,573 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 SD115 over Nine Mile Ck built?

It was built in 2011, making it 14 years old in 2025.

What condition is SD115 over Nine Mile Ck 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 October 2023.

How much traffic does SD115 over Nine Mile Ck carry?

About 2,701 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SD115 over Nine Mile Ck?

The structure is 26 ft (8 m) long with a longest span of 13 ft (3.9 m).

Who owns SD115 over Nine Mile Ck?

It is owned by the State Highway Agency.