About Us

76 Years of Service

Built on the principles of sound engineering, integrity, and ingenuity, WHKS & Co. remains dedicated to serving our clients by putting people first and providing innovative solutions and exceptional service. We are committed to improving lives and building communities through consulting services, clear communication, and collaboration. These principles, along with our experience, lays the foundation to shape the horizon.


Improving Lives,
Building Communities

The Founders

WHKS & Co. began in 1948 as the Wallace Engineering Company in Clear Lake, Iowa. The office moved to Mason City the following year.

In 1956, the Company became known as Wallace and Holland when Francis Holland joined as a partner with Ralph Wallace. In 1964 Frank Schmitz and Dick Kastler became partners and the name was changed to Wallace Holland Kastler & Schmitz.

In 1994, the shareholders changed the Company name to WHKS & Co.

L to R: Richard 'Dick' Kastler, Francis Holland, Ralph Wallace, Frank Schmitz

Shaping the Community

In 2021, WHKS was named the Flagship Investor of the year for the North Iowa Corridor Economic Development Investor campaign.  The North Iowa Corridor’s annual campaign generates private investment to complement public funding it receives from the City of Mason City, Cerro Gordo County, and the City of Clear Lake.  Investors help the corridor promote the region, develop business recruitment and retention, and improve workforce development.

Here at WHKS, we recognize that economic development is the key component in the health of the communities that surround us.  We strive to continue pushing communities forward and driving future growth.

Engineering Disciplines

WHKS offers a wide spectrum of services ranging from the initial planning and funding stages through to project design and construction.

Moving Traffic Smoothly

  • Bridges and Highway Structures
  • Roadways
  • Streets and Streetscapes
  • Traffic Engineering

Servicing the Community

  • Inflow and Infiltration (I/I)
  • Municipal Underground Utilities
  • Water
  • Wastewater

Creating a Sustainable Future

  • Drainage, Hydrology, and Hydraulics
  • Environmental Services
  • Parks and Recreation Facilities
  • Stormwater Management

Supporting Industry
and Commerce

  • Buildings and Structures
  • Land Development
  • Forensic Engineering

Boots on the Ground

  • Construction-Related Services
  • Geographic Information Systems (GIS)
  • Survey

Head to our services page to learn more!

Commitment to Client Service

In 2016, 2017, 2019, 2020, and 2021 WHKS & Co. was the recipient of the Premier Award for Client Satisfaction from PSMJ | Resources, Inc.

The Premier Award recognizes firms in the engineering, architecture and construction industries that receive exceptional client service ratings.

2020 Premier Award
2019 Premier Award
2017 Premier Award
2016 Premier Award

"What Drives A City Engineer?"

Brandon T.
Municipal Engineer