US Bridges

County Highway #9 over Little White Rv

Fair

Mellette County, South Dakota · 11.6S & 4.3W White River · Structure no. 000000048207324

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
145 ft
3 main spans
Daily traffic
18
2022 count
Owner
County
County Highway Agency

About this bridge

County Highway #9 over Little White Rv is a steel stringer/multi-beam or girder carrying County Highway #9 over Little White Rv in Mellette County, South Dakota. It was built in 1970, so it is 55 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 18 vehicles a day, roughly 2% of them trucks, projected to reach 20 by 2032. The structure is 145 ft (44.2 m) long and 31 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesCounty Highway #9
CrossesLittle White Rv
Location11.6S & 4.3W White River
RouteCounty Highway 0
CountyMellette County
StateSouth Dakota
Coordinates43.39716, -100.83551
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating41.2 US tons
Inventory rating24.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span54 ft (16.5 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18 (2022)
Projected traffic20 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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$44,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway #9 over Little White Rv built?

It was built in 1970, making it 55 years old in 2025.

What condition is County Highway #9 over Little White 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 July 2024.

How much traffic does County Highway #9 over Little White Rv carry?

About 18 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Highway #9 over Little White Rv?

The structure is 145 ft (44.2 m) long with a longest span of 54 ft (16.5 m) and a deck 31 ft wide.

Who owns County Highway #9 over Little White Rv?

It is owned by the County Highway Agency.