US Bridges

SD020 over Snake Ck

Fair

Spink County, South Dakota · 4.3 E Faulk CO Line · Structure no. 000000058043060

Built
1959
66 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
117 ft
5 main spans
Daily traffic
972
2024 count
Owner
State
State Highway Agency

About this bridge

SD020 over Snake Ck is a concrete continuous slab carrying SD020 over Snake Ck in Spink County, South Dakota. It was built in 1959, so it is 66 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 5 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 972 vehicles a day, roughly 12% of them trucks, projected to reach 1,323 by 2044. The structure is 117 ft (35.7 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSD020
CrossesSnake Ck
Location4.3 E Faulk CO Line
RouteState Highway 20
Coordinates45.15872, -98.62967
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.8 US tons
Inventory rating33.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length117 ft (35.7 m)
Longest span23 ft (7.1 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic972 (2024)
Projected traffic1,323 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 SD020 over Snake Ck built?

It was built in 1959, making it 66 years old in 2025.

What condition is SD020 over Snake 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 April 2024.

How much traffic does SD020 over Snake Ck carry?

About 972 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is SD020 over Snake Ck?

The structure is 117 ft (35.7 m) long with a longest span of 23 ft (7.1 m) and a deck 34 ft wide.

Who owns SD020 over Snake Ck?

It is owned by the State Highway Agency.