US Bridges

US018 over Turkey Ridge Ck

Good

Turner County, South Dakota · 1.7 W JCT Sd 19 · Structure no. 000000063142180

Built
2019
6 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
173 ft
4 main spans
Daily traffic
1,494
2024 count
Owner
State
State Highway Agency

About this bridge

US018 over Turkey Ridge Ck is a concrete continuous slab carrying US018 over Turkey Ridge Ck in Turner County, South Dakota. It was built in 2019, so it is 6 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 1,494 vehicles a day, roughly 16% of them trucks, projected to reach 2,499 by 2044. The structure is 173 ft (52.8 m) long and 39 ft wide. If it were closed, the detour would be 41 mi (66 km).

CarriesUS018
CrossesTurkey Ridge Ck
Location1.7 W JCT Sd 19
RouteU.S. Route 18
Coordinates43.24265, -97.11706
Functional classRural Principal Arterial - Other

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 inspectionOctober 2023
Inspection intervalevery 48 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 rating59.6 US tons
Inventory rating46.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length173 ft (52.8 m)
Longest span48 ft (14.5 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,494 (2024)
Projected traffic2,499 by 2044
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 km)
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 US018 over Turkey Ridge Ck built?

It was built in 2019, making it 6 years old in 2025.

What condition is US018 over Turkey Ridge 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 US018 over Turkey Ridge Ck carry?

About 1,494 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is US018 over Turkey Ridge Ck?

The structure is 173 ft (52.8 m) long with a longest span of 48 ft (14.5 m) and a deck 39 ft wide.

Who owns US018 over Turkey Ridge Ck?

It is owned by the State Highway Agency.