US Bridges

County RD over Sand Ck

Poor

Sanborn County, South Dakota · 2N & 1.6W Forestburg · Structure no. 000000056094100

Built
1940
85 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
120 ft
4 main spans
Daily traffic
70
2022 count
Owner
County
County Highway Agency

About this bridge

County RD over Sand Ck is a steel stringer/multi-beam or girder carrying County RD over Sand Ck in Sanborn County, South Dakota. It was built in 1940, so it is 85 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 70 vehicles a day, roughly 3% of them trucks, projected to reach 70 by 2032. The structure is 120 ft (36.6 m) long and 21 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCounty RD
CrossesSand Ck
Location2N & 1.6W Forestburg
RouteCounty Highway 0
Coordinates44.05442, -98.14368
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating46.5 US tons
Inventory rating27.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length120 ft (36.6 m)
Longest span30 ft (9.1 m)
Deck width21 ft (6.3 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2022)
Projected traffic70 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD over Sand Ck built?

It was built in 1940, making it 85 years old in 2025.

What condition is County RD over Sand Ck in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does County RD over Sand Ck carry?

About 70 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is County RD over Sand Ck?

The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 21 ft wide.

Who owns County RD over Sand Ck?

It is owned by the County Highway Agency.