US Bridges

Corson County 35 over Grand River

Poor

Corson County, South Dakota · 2.4E & 16S Thunder Hawk · Structure no. 000000016042165

Built
1990
35 years old
Condition
Poor
inspected June 2024
Type
Culvert
Steel
Length
140 ft
6 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Corson County 35 over Grand River is a steel culvert carrying Corson County 35 over Grand River in Corson County, South Dakota. It was built in 1990, so it is 35 years old, younger 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 20 vehicles a day, projected to reach 20 by 2042. The structure is 140 ft (42.7 m) long and 28 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesCorson County 35
CrossesGrand River
Location2.4E & 16S Thunder Hawk
RouteCounty Highway 0
CountyCorson County
StateSouth Dakota
Coordinates45.71147, -101.9206
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating99.6 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans6
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span5 ft (1.5 m)
Deck width28 ft (8.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Corson County 35 over Grand River built?

It was built in 1990, making it 35 years old in 2025.

What condition is Corson County 35 over Grand River 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 June 2024.

How much traffic does Corson County 35 over Grand River carry?

About 20 vehicles per day (2022 count).

How long is Corson County 35 over Grand River?

The structure is 140 ft (42.7 m) long with a longest span of 5 ft (1.5 m) and a deck 28 ft wide.

Who owns Corson County 35 over Grand River?

It is owned by the County Highway Agency.