US Bridges

New Underwood Rd. over Belle Fourche Rv

Fair

Meade County, South Dakota · 17 N New Underwood · Structure no. 000000047363476

Built
1975
50 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
350 ft
4 main spans
Daily traffic
280
2022 count
Owner
County
County Highway Agency

About this bridge

New Underwood Rd. over Belle Fourche Rv is a prestressed concrete continuous stringer/multi-beam or girder carrying New Underwood Rd. over Belle Fourche Rv in Meade County, South Dakota. It was built in 1975, so it is 50 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 280 vehicles a day, roughly 3% of them trucks, projected to reach 280 by 2032. The structure is 350 ft (106.7 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

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CarriesNew Underwood Rd.
CrossesBelle Fourche Rv
Location17 N New Underwood
RouteCounty Highway 0
CountyMeade County
StateSouth Dakota
Coordinates44.35045, -102.83772
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 alignment6: Equal to present minimum criteria
Operating rating86.3 US tons
Inventory rating44.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span87 ft (26.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2022)
Projected traffic280 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was New Underwood Rd. over Belle Fourche Rv built?

It was built in 1975, making it 50 years old in 2025.

What condition is New Underwood Rd. over Belle Fourche 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 New Underwood Rd. over Belle Fourche Rv carry?

About 280 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is New Underwood Rd. over Belle Fourche Rv?

The structure is 350 ft (106.7 m) long with a longest span of 87 ft (26.5 m) and a deck 35 ft wide.

Who owns New Underwood Rd. over Belle Fourche Rv?

It is owned by the County Highway Agency.