US Bridges

Nemo Road over Boxelder Ck

Poor

Lawrence County, South Dakota · 1.3N 2.5W of Nemo · Structure no. 000000041250268

Built
1975
50 years old
Condition
Poor
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
66 ft
1 main span
Daily traffic
300
2022 count
Owner
County
County Highway Agency

About this bridge

Nemo Road over Boxelder Ck is a prestressed concrete continuous box beam or girders - multiple carrying Nemo Road over Boxelder Ck in Lawrence 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 poor condition with a lowest component rating of 2 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 300 vehicles a day, roughly 3% of them trucks, projected to reach 300 by 2032. The structure is 66 ft (20.1 m) long and 31 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesNemo Road
CrossesBoxelder Ck
Location1.3N 2.5W of Nemo
RouteCounty Highway 0
Coordinates44.21613, -103.55306
Functional classRural Major Collector

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating96.9 US tons
Inventory rating58 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length66 ft (20.1 m)
Longest span64 ft (19.5 m)
Deck width31 ft (9.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2022)
Projected traffic300 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nemo Road over Boxelder Ck built?

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

What condition is Nemo Road over Boxelder 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 July 2024.

How much traffic does Nemo Road over Boxelder Ck carry?

About 300 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Nemo Road over Boxelder Ck?

The structure is 66 ft (20.1 m) long with a longest span of 64 ft (19.5 m) and a deck 31 ft wide.

Who owns Nemo Road over Boxelder Ck?

It is owned by the County Highway Agency.