US Bridges

SD011 over Beaver Ck

Fair

Lincoln County, South Dakota · 2.5 N JCT US 18 · Structure no. 000000042140115

Built
1963
62 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
145 ft
3 main spans
Daily traffic
3,042
2024 count
Owner
State
State Highway Agency

About this bridge

SD011 over Beaver Ck is a steel continuous stringer/multi-beam or girder carrying SD011 over Beaver Ck in Lincoln 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 3,042 vehicles a day, roughly 5% of them trucks, projected to reach 5,150 by 2044. The structure is 145 ft (44.2 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSD011
CrossesBeaver Ck
Location2.5 N JCT US 18
RouteState Highway 11
Coordinates43.33733, -96.64866
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span55 ft (16.8 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,042 (2024)
Projected traffic5,150 by 2044
Trucks5%
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 SD011 over Beaver Ck built?

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

What condition is SD011 over Beaver 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 November 2024.

How much traffic does SD011 over Beaver Ck carry?

About 3,042 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is SD011 over Beaver Ck?

The structure is 145 ft (44.2 m) long with a longest span of 55 ft (16.8 m) and a deck 32 ft wide.

Who owns SD011 over Beaver Ck?

It is owned by the State Highway Agency.