US Bridges

SD089 over Dry Run Ck

Fair

Custer County, South Dakota · 7.2 N Fall River CO Line · Structure no. 000000017211208

Built
1970
55 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
1,218
2024 count
Owner
State
State Highway Agency

About this bridge

SD089 over Dry Run Ck is a concrete continuous slab carrying SD089 over Dry Run Ck in Custer County, South Dakota. It was built in 1970, so it is 55 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 1,218 vehicles a day, roughly 9% of them trucks, projected to reach 1,987 by 2044. The structure is 106 ft (32.3 m) long and 39 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesSD089
CrossesDry Run Ck
Location7.2 N Fall River CO Line
RouteState Highway 89
Coordinates43.56714, -103.63784
Functional classRural Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.3 US tons
Inventory rating44.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span38 ft (11.6 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,218 (2024)
Projected traffic1,987 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

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 SD089 over Dry Run Ck built?

It was built in 1970, making it 55 years old in 2025.

What condition is SD089 over Dry Run 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 February 2023.

How much traffic does SD089 over Dry Run Ck carry?

About 1,218 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is SD089 over Dry Run Ck?

The structure is 106 ft (32.3 m) long with a longest span of 38 ft (11.6 m) and a deck 39 ft wide.

Who owns SD089 over Dry Run Ck?

It is owned by the State Highway Agency.