SDDOT Acorn Ridge

SDDOT Acorn Ridge

The Acorn Ridge Box Culvert is a South Dakota Department of Transportation Project that is located on the east – west frontage road south of I-90 and east of the Elk Horn Ridge Country Club. Although it is on a secondary access road, the unique location is a major structure on a highly used frontage road that provides an easterly connection to Highway 85 going to Deadwood and a westerly connection to Highway 34 heading to Belle Fourche without having to access I-90. It is also the major access to the 70 home Elk Horn Ridge Subdivision. The design of the structure is unique in that it also had to service golf cart and golf course maintenance traffic under the road to access the back 9 holes of the Elk Horn Ridge Country Club while accommodating stormwater runoff in the affected drainage area. To do this the SDDOT contracted with HDR Inc. in Rapid City, SD to design a 4 barrel 12’ x 12’ cast in place box culvert. The two outside barrels were concrete paths for golf cart access. The project was Design- Bid – Build.



  • Government and Cultural


  • Ainsworth-Benning Construction


  • In Progress




  • I-90 E. of Elk Horn Ridge Country Club

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