, Inc. was formed in April 2002 to provide Consulting Structural Engineering services.  Our staff consists of four experienced structural engineers, Greg Hannestad, PE, Brian Welch, PE,SE, Mark Smith, PE, SE and Rob Maher, PE  -  two with Master’s degrees in Structural Engineering. Our staff averages 20 years experience in design and construction of regional projects. Our staff includes two of the very few engineers in South Dakota with the additional Structural II PE description.


  • Consulting Engineering for Architects
  • Structural Engineering for Homebuilders
  • Field Engineering for Contractors
  • Forensic Engineering for Owners
  • Forensic investigations for Insurance/Attorneys
  • Structural Surveys of existing Public Buildings
  • Analysis of existing structures
  • Design of Highway Bridges
  • Design of Box Culverts & Retaining Walls
  • Special Inspections to satisfy IBC
  • Renovations of historic buildings
  • Detailing precast concrete members
  • Design of elementary/middle/high schools
  • Design of higher education facilities
  • Wood-framed Apartment buildings
  • Design of Cofferdams
  • Deep foundations – piling/caissons
  • Structural Steel design and detailing
  • Prestressed/post-tensioned concrete
  • Finite Element Analysis
  • Design of pedestrian walkways/bridges

Butterfly House, Sioux Falls, SD

Sioux Falls Fire Station 42