US Bridges

Nemo Road over Boxelder Ck

Fair

Pennington County, South Dakota · 9.8W 3.5N Rapid City · Structure no. 000000052321266

Built
1972
53 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
131 ft
3 main spans
Daily traffic
1,452
2022 count
Owner
County
County Highway Agency

About this bridge

Nemo Road over Boxelder Ck is a prestressed concrete tee beam carrying Nemo Road over Boxelder Ck in Pennington County, South Dakota. It was built in 1972, so it is 53 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 1,452 vehicles a day, roughly 3% of them trucks, projected to reach 1,452 by 2032. The structure is 131 ft (39.9 m) long and 31 ft wide. If it were closed, the detour would be 46 mi (74 km).

Location

Open in Google Maps
CarriesNemo Road
CrossesBoxelder Ck
Location9.8W 3.5N Rapid City
RouteCounty Highway 0
CountyPennington County
StateSouth Dakota
Coordinates44.1311, -103.41257
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating39 US tons
Inventory rating17 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span49 ft (14.9 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,452 (2022)
Projected traffic1,452 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46 mi (74 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 1972, making it 53 years old in 2025.

What condition is Nemo Road over Boxelder Ck 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 June 2024.

How much traffic does Nemo Road over Boxelder Ck carry?

About 1,452 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Nemo Road over Boxelder Ck?

The structure is 131 ft (39.9 m) long with a longest span of 49 ft (14.9 m) and a deck 31 ft wide.

Who owns Nemo Road over Boxelder Ck?

It is owned by the County Highway Agency.