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About 300 professionals deliver an impressive range of engineering, mapping, environmental, architectural, and survey services at Ayres Associates. Our filterable database makes it easy to check out the credentials of key staff in the disciplines of interest to you – and to contact them directly to get more information about working with you on a project.

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Peter Lagasse

Senior Hydraulic Engineer

Fort Collins, CO
970.223.5556
LagasseP@AyresAssociates.com

"Pete puts together the best project teams that we've ever worked with. They are the cream of the crop. Ayres always delivers on time, and Pete is legendary."
David Reynaud
National Cooperative Highway Research Program

Pete is a lead bridge hydraulics engineer. Before entering private practice in 1981, Pete gained 20 years of engineering experience with the U.S. Army Corps of Engineers and academic assignments at the U.S. Military Academy, West Point, New York.

Since 1989 he has been principal instructor for Federal Highway Administration (FHWA) projects to develop and present training courses on stream stability and scour at highway bridges. As part of these projects, Pete is senior author of HEC-20, "Stream Stability at Highway Structures," and HEC-23, "Bridge Scour and Stream Instability Countermeasures." He is also a technical contributor to HEC-18, "Scour at Bridges."

He prepared the Instructor Guide and Participant Workbook that support the National Highway Institute (NHI) Training Course on Stream Stability and Scour at Bridges and managed, scheduled, and participated in the presentation of this course more than 200 times to state departments of transportation. In cooperation with FHWA reviewers, Pete recently completed extensive revisions of this course and developed NHI's new countermeasure design course. He received Instructor of Excellence awards from NHI for his teaching work in 2010 and 2012.

Pete's areas of expertise include the following:

  • River engineering
  • Stream stability and scour at bridges
  • Development and presentation of NHI courses
  • Project management
  • River hydraulics and morphology
  • Coastal processes
  • Erosion and sedimentation
  • Hydraulics
  • Bridge scour evaluation
  • Geomorphic studies
  • Bridge scour and stability analysis
  • Instructor for NHI course "Stream Stability and Scour at Highway Structures"
  • Author of HEC-20, "Stream Stability at Highway Bridges"
  • Author of HEC-23, "Bridge Scour and Stream Instability Countermeasures"
  • Technical and QA/QC of Phase 1 and 2 bridge evaluations
  • Co-principal on scour monitoring device development
  • Hydraulics and morphology of river systems
  • Co-author of HDS-6, "Highways in the River Environment"
Certifications
  • FHWA NHI 420018 Instructor Development
Education
  • PhD, Civil Engineering (Hydraulics), Colorado State University
  • MS, Civil Engineering (Coastal), University of California, Berkeley
  • BS, Civil Engineering, West Point
Registrations
  • Registered Professional Engineer, CO