US Bridges

US385 over Horsehead Ck

Fair

Fall River County, South Dakota · 5.0 S JCT US 18 E · Structure no. 000000024420250

Built
1963
62 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
129 ft
5 main spans
Daily traffic
673
2023 count
Owner
State
State Highway Agency

About this bridge

US385 over Horsehead Ck is a concrete continuous slab carrying US385 over Horsehead Ck in Fall River County, South Dakota. It was built in 1963, so it is 62 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 673 vehicles a day, roughly 21% of them trucks, projected to reach 853 by 2043. The structure is 129 ft (39.2 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS385
CrossesHorsehead Ck
Location5.0 S JCT US 18 E
RouteU.S. Route 385
Coordinates43.11596, -103.22868
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length129 ft (39.2 m)
Longest span26 ft (7.8 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic673 (2023)
Projected traffic853 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 US385 over Horsehead Ck built?

It was built in 1963, making it 62 years old in 2025.

What condition is US385 over Horsehead Ck in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does US385 over Horsehead Ck carry?

About 673 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US385 over Horsehead Ck?

The structure is 129 ft (39.2 m) long with a longest span of 26 ft (7.8 m) and a deck 34 ft wide.

Who owns US385 over Horsehead Ck?

It is owned by the State Highway Agency.