US Bridges

145 Street over Whetstone Rv

FairPosted for load

Grant County, South Dakota · 0.6S & 2.4W Big Stone · Structure no. 000000026352030

Built
1959
66 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
198 ft
4 main spans
Daily traffic
374
2022 count
Owner
County
County Highway Agency

About this bridge

145 Street over Whetstone Rv is a steel stringer/multi-beam or girder carrying 145 Street over Whetstone Rv in Grant County, South Dakota. It was built in 1959, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 374 vehicles a day, roughly 19% of them trucks, projected to reach 374 by 2017. The structure is 198 ft (60.4 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries145 Street
CrossesWhetstone Rv
Location0.6S & 2.4W Big Stone
RouteCounty Highway 0
Coordinates45.28333, -96.50999
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating14 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length198 ft (60.4 m)
Longest span49 ft (14.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic374 (2022)
Projected traffic374 by 2017
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$30,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 145 Street over Whetstone Rv built?

It was built in 1959, making it 66 years old in 2025.

What condition is 145 Street over Whetstone Rv 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 September 2024.

How much traffic does 145 Street over Whetstone Rv carry?

About 374 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is 145 Street over Whetstone Rv?

The structure is 198 ft (60.4 m) long with a longest span of 49 ft (14.9 m) and a deck 26 ft wide.

Who owns 145 Street over Whetstone Rv?

It is owned by the County Highway Agency.