Ehrhart Griffin and Associates| Civil Engineering

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Sioux Falls, South Dakota

In 2001 we opened our branch office in Sioux Falls, South Dakota. Nicholas J. Johannsen is president of the Sioux Falls, South Dakota operation of Ehrhart Griffin & Associates, Inc. and is the principal land surveyor and civil engineer.

The Sioux Falls' civil engineering department has a diversified range of experience including:

Site development
Site grading
Street and roadway layout
Design, parking arrangements for on-grade and structural configurations
Storm and sanitary sewer analysis and design
Storm water drainage studies
Detention facilities
Soil erosion control installations
Trail networks
Recreational facilities
HEC2 analysis for river flow and bridge design
Potable water system design
Elevated potable water storage tank design
Miscellaneous utility relocations.

The Sioux Falls' surveying department has a broad range of experience in all facets of land surveying, including:

Boundary surveys
Topographic surveys
ALTA
Improvement Location Certificates
Property subdivision surveys
Global Positioning System (GPS) surveys
Aerial photography control surveys
Construction layout services.

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