US Bridges

205th Street over Six Mile Ck

PoorPosted for load

Brookings County, South Dakota · 1.5S & 2.2W White · Structure no. 000000006218090

Built
1930
95 years old
Condition
Poor
inspected September 2023
Type
Truss - Thru
Steel
Length
53 ft
1 main span
Daily traffic
92
2022 count
Owner
County
County Highway Agency

About this bridge

205th Street over Six Mile Ck is a steel truss - thru carrying 205th Street over Six Mile Ck in Brookings County, South Dakota. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 92 vehicles a day, roughly 2% of them trucks, projected to reach 92 by 2032. The structure is 53 ft (16.2 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries205th Street
CrossesSix Mile Ck
Location1.5S & 2.2W White
RouteCounty Highway 0
Coordinates44.41244, -96.69022
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating35.4 US tons
Inventory rating20.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span50 ft (15.3 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92 (2022)
Projected traffic92 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 205th Street over Six Mile Ck built?

It was built in 1930, making it 95 years old in 2025.

What condition is 205th Street over Six Mile 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 September 2023.

How much traffic does 205th Street over Six Mile Ck carry?

About 92 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 205th Street over Six Mile Ck?

The structure is 53 ft (16.2 m) long with a longest span of 50 ft (15.3 m) and a deck 18 ft wide.

Who owns 205th Street over Six Mile Ck?

It is owned by the County Highway Agency.