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Roadway Design

Four images of roadway interchanges
Roadway Design

Roadway Design is at the heart of what we do at Isthmus. We have worked on projects in every MnDOT district across the state as well as for a growing number of counties and municipalities. We stay up to date on the latest design standards and understand how to effectively use design software to achieve efficient, predictable, and accurate results. We bring this knowledge and experience while approaching each design decision with a project-specific context.

Modeling is integral to our overall approach to roadway design from preliminary through final design and construction. We are invested in continuing to leverage new and emerging technologies to advance the quality of our design.

Areas of Specialty

Preliminary Design

  • Alternatives Analysis
  • Construction Impacts
  • Geometric Layouts
  • 3D Modeling & Visualization



Final Design

  • Plan Preparation
  • 3D Modeling & Surfaces
  • Construction Specifications
  • Cost Estimates



Project Types

  • Complex Rural & Urban Interchanges
  • Rest Areas
  • Roundabouts
  • Reduced Conflict Intersections
  • Pavement Preservation
  • Complete Streets
  • Reconstruction

Featured Experience

Featured Team Members

Michelle Gerrity

Michelle Gerrity, PE

Michelle brings her all to Isthmus. Adeptly balancing project management and the nuances of detailed design, she thoughtfully mentors the next generation of engineers. Project partners rely on Michelle and her project teams to accommodate quick-turnaround requests that advance decision-making.
headshot of Amy DeBruin

Amy DeBruin, PE

In addition to her down-to-earth, approachable demeanor, project partners appreciate Amy for her unmatched attention to detail and willingness to share her knowledge. She leads projects with a commitment to maintaining open communication, achieving deadlines, and delivering high-quality results.
headshot of Andrea Fastenow

Andrea Fastenow, PE

Andrea's passion for the technical nuances of geometric design, corridor modeling, and plan development makes her a sought-after lead designer and quality reviewer. Her repertoire ranges from complex interchanges, rural highways, and Complete Streets to roundabouts, RCUTs, and rest areas.
Heather Redetzke

Heather Redetzke, PE

Heather is both a talented highway designer and a thoughtful team leader. Her approach to project and quality management centers on drawing upon each individual's strengths to collectively deliver exceptional design.
Daren Ellefson

Daren Ellefson, PE

Daren is a versatile Project Engineer who understands transportation engineering beyond the design perspective. Along with his solid engineering background, Daren's upbeat attitude and dependable follow-through exemplify the Isthmus ideal of mutual accountability.
Heath Oeltjen

Heath Oeltjen, PE

Heath's use of 3D modeling tools in the design of complex transportation projects informs his approach as a CADD trainer and ProjectWise administrator. His choice to remain focused on the technical aspects of design offers a depth of knowledge that is immensely valuable to his project teams.
Jason Tschida

Jason Tschida, PE

Jason has the ability to make the complex seem simple. He combines his 3D modeling expertise with his enthusiasm for drone-collected imagery, developing the Isthmus process for creating immersive visualizations which enhance stakeholder understanding of project alternatives and outcomes.
headshot of Ronald Dee

Ronald Dee, PE

Ronald's signature smile reflects the positive and helpful attitude that he brings to work each day. Whether welcoming new members to our growing team or offering over-the-shoulder CADD support to our clients, Ronald's patient encouragement sets a tone where curiosity translates to learning.
headshot of Trang Tran

Trang Tran, PE

Trang is relied upon for the consistent quality and thoughtfulness of her work, which she delivers with a degree of efficiency that is notable even at Isthmus. Always adaptable to new situations and willing to take on challenges, she brings creativity and impressive multitasking skills to her work.
Yuxuan Li

Yuxuan Li, PE

Yuxuan's creativity and passion for art translates to her engineering design work. Thorough and efficient, she works closely with project managers and other engineers throughout various aspects of preliminary and final design.
Katie Johnson

Katie Johnson

While it's not rocket science, Katie brings her background as a mechanical engineer in the aerospace industry and knack for nuanced problem solving to her well-established role as the go-to Isthmus resource for advanced corridor modeling support.
headshot of Esther Steier

Esther Steier, EIT

With a first career teaching, Esther is a continous learner and natural collaborator. Since joining Isthmus, Esther has mastered the use of CADD as a design and plan development tool.
Luke Schneider

Luke Schneider, EIT

Always up for a challenge and eager to expand his knowledge of roadway design, Luke is a focused and highly-capable emerging engineer. His aptitude for leveraging 3D design and corridor modeling tools have quickly earned him a reputation as a go-to resource for our team.