Below is a current list of registrants.
| Full Name | Company |
|---|---|
| Haden Brown | Nilex Inc. |
| Olin Brown | Bohannan Huston, Inc. |
| Susan Brown | Valerian |
| Patrick Buckley | City of Commerce City |
| Matthew Buddie | DHS FEMA Region VIII |
| Kevin Buffington | Town of Castle Rock |
| Ryan Byrne | Martin/Martin |
| Chad Cantrell | JVA, Inc. |
| Chris Carlson | City of Loveland |
| Troy Carmann | ICON Engineering, Inc. |
| Jason Carr | S. A. Miro, Inc. |
| Brendan Carroll | RS&H |
| Ryan Carroll | Michael Baker International |
| Michael Cartmell | El Paso County - Department of Public Works |
| Ken Cecil | J3 Engineering Consultants, Inc. |
| Olivia Cecil | Boulder County Transportation |
| Dave Center | AECOM |
| Si Na Chau | Ascent Geomatics Solutions |
| Melanie Chenard | Muller Engineering Company |
| Lisa Cherry | Denver Infrastructure Project Management |
| Pam Cherry | Morgan County |
| Barbara Chongtoua | UDFCD |
| Catherine Christoff | Pitkin County |
| Tyler Christoff | City of Aspen |
| Jesse Clark | Stream Landscape Architecture |
| Tiffany Clark | SEMSWA |
| Will Comerer | SGM |
| John Conn | Jefferson County |
| Aaron Cook | Jacobs |
| Erin Cooper | Boulder County |
| Adam Copper | City of Colorado Springs, Water Resources Engineering |
| Kurtis Cotten | Arapahoe County |
| Ryan Crum | City and County of Denver |
| Griffin Cullen | AECOM |
| Susan Cundiff | Tetra Tech |
| Jim Curry | ADS |
| Keith Curtis | Pikes Peak Regional |
| Joanna Czarnecka | Watermia Consulting LLC |
| Kelsey Czyzyk | Muller Engineering Company |
| Michael Daly | Wilson & Company, Inc. |
| Erik Dam | Town of Castle Rock |
| Paul Danley | SEMSWA |
| Jamis Darrow | Anderson Consulting Engineers, Inc. |
| Jamie Davis | ECI Site Construction |
| Stephen Decker | Westervelt Ecological Services |
| Jim Dederick | Douglas County Public Works Engineering |
| Remmet deGroot | AECOM |
| Jeremy Deischer | ICON Engineering, Inc. |
| Tyler Dell | Colorado Stormwater Center - CSU |
| Tim DeMasters | CORVUS Environmental |