People
Over the years, we’ve been honored to welcome some of the most talented minds in the industry to our team, and our partners benefit from their knowledge, guidance, and expertise.

Dave Pantzlaff
Director of Midwest Transportation Services
Eau Claire, WI
715.834.3161
PantzlaffD@AyresAssociates.com
"I think the thing I've enjoyed the most about my career at Ayres is getting to know a diverse clientele and being able to work with them to solve their problems, whether it's a technical engineering issue or simply navigating the agency approval process on their behalf."David Pantzlaff
I focus my more than four decades of structural engineering experience toward understanding what clients need and directing the collective energy of Ayres' respected roadway, structures, and traffic engineers toward solving transportation problems. I have been a project engineer and manager for various bridge projects with Ayres since 1978 and managed the bridge operation from 1990 to early 2020 before becoming director of Midwest transportation services.
I've been involved in a variety of structural design projects, including dams, over 1,000 bridges, buildings, tanks, and walls. I have managed bridge replacement and highway approach roadway reconstruction projects, including engineering design, client contact, and agency coordination. I've also overseen and managed the design of large bridges on major rivers, complex interchange structures, and various pedestrian bridges.
My areas of expertise include the following:
- Project management, planning, and cost and quality control
- State, county, and township highway bridge design
- Right-of-way plats and descriptions
- Preparation of bid documents
- Bridge type studies
- Bridge load rating
- Bridge rehabilitation and repair
- Pedestrian and railroad bridges
- Location studies
- Environmental impact studies and assessments
- Retaining wall design
- Foundations
Education
- MS, Structural Engineering, Iowa State University
- BS, Civil Engineering, University of Wisconsin-Platteville
Registrations
- Registered Professional Engineer, IL
- Registered Professional Engineer, WI
- Registered Professional Engineer, IA
- Registered Professional Engineer, MN
- Registered Professional Engineer, MI
- Registered Professional Engineer, FL
- Registered Professional Engineer, AZ
- Jackson County Courthouse Addition
- Oakwood Ridge Apartments
- Wipfli Office Building
- Eau Claire Fleet Farm
- Preferred Sands General Engineering
- US 51/STH 29 Roadway Design
- Chippewa River Trail under Farwell
- I-39/Business 51 Interchange
- Portage CTH J Overpass
- Smokey Falls Pedestrian Bridge
- Pigeon River Bridge
- Columbia CTH V Reconstruction
- US 51/CTH U/CTH K/B51 Interchange
- STH 29 Bridges and Pavement
- STH 13 Roadway & Silver Creek Bridge
- Dodge County Bridge Replacements
- Verona Old CTH PB Bridge
- Lafayette CTH U Bridge Replacement
- CTH E over Sherman Creek Bridge
- Iron CTH E Bridge over Alder Creek
- Dedham Road over Nemadji River
- Douglas CTH M over Tamarack
- Ashland CTH N over Chippewa
- Tainter Lake Bridge
- Chippewa CTH X Bridge
- Plank Road Bridge Rehabilitations
- Langlade CTH C Bridges
- Bong Memorial Bridge Rehabilitation
- IH 94 St. Croix County Overpasses
- Wozny Road Bridge over Totagatic River
- Sleepy Valley Loop over Middle River Bridge
- Lima Road Bridge Study & Replacement
- High Bridge Bike/Pedestrian Facility
- Grand Avenue Half Moon Lake Bridge
- Lyga Road over Traverse Valley Creek
- State Street over Black River Bridge
- Old 63 Bridge over 18 Mile Creek
- Pleasant View Road Design
- Rock County New CTH BT
- I-39 Bridges over US 51
- Hattie Street over Menominee River Bridge
- Racine West 6th Street Bridge
- Fox Point Footbridge
- Oneida Street Reconstruction
- US 17-92 Pedestrian Bridge
- Merrimac Railroad Bridge Inspection
- Courtney Campbell Trail
- I-39/US 51 Interchange Signals
- Lake Bronson Dam
- University Avenue Tunnel