US Bridges

SD022 over Cobb Ck

Fair

Deuel County, South Dakota · 8.7 E JCT Sd 15 · Structure no. 000000020187160

Built
1955
70 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
97 ft
3 main spans
Daily traffic
932
2024 count
Owner
State
State Highway Agency

About this bridge

SD022 over Cobb Ck is a steel stringer/multi-beam or girder carrying SD022 over Cobb Ck in Deuel County, South Dakota. It was built in 1955, so it is 70 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 932 vehicles a day, roughly 20% of them trucks, projected to reach 1,266 by 2044. The structure is 97 ft (29.7 m) long and 32 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesSD022
CrossesCobb Ck
Location8.7 E JCT Sd 15
RouteState Highway 22
CountyDeuel County
StateSouth Dakota
Coordinates44.74713, -96.50659
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment7: Better than present minimum criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length97 ft (29.7 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic932 (2024)
Projected traffic1,266 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 SD022 over Cobb Ck built?

It was built in 1955, making it 70 years old in 2025.

What condition is SD022 over Cobb 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 2023.

How much traffic does SD022 over Cobb Ck carry?

About 932 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is SD022 over Cobb Ck?

The structure is 97 ft (29.7 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns SD022 over Cobb Ck?

It is owned by the State Highway Agency.