Below is a current list of registrants.
| Full Name | Company |
|---|---|
| Dusty Robinson | Ayres Associates |
| Kenneth Robinson | Atkins |
| Mark Rocheleau | JVA, Inc. |
| Jorge Rodriguez | AECOM |
| Joseph Roerkohl | AECOM |
| Sam Rogers | Muller Engineering Company |
| Josh Root | Stanley Consultants |
| Rigel Rucker | AECOM |
| Thom Rutledge | Jacobs |
| Rachel Sabbato | Gunnison County |
| Steve Salazar | Wilson & Company, Inc. |
| Scott Samuels | Mesa County |
| David Samuelson | Town Telluride |
| John Santos | AquaShield, Inc. |
| Charles Schrader | Pinyon Environmental, Inc. |
| Chad Schroeder | Town of Erie |
| Mark Schutte | Mile High Flood District |
| Steven Scott | Hanes Geo Components |
| Lee Seaman | Bowman Construction Supply |
| Alan Searcy | City of Lakewood |
| Heather Seitz | ICON Engineering, Inc. |
| hillary seminick | Gunnison County |
| Hillary Seminick | Gunnison County |
| Tim Semones | City of Thornton |
| Traci Shambo | Larimer county |
| Dan Shea | Merrick & Company |
| Ben Sheets | City of Fountain |
| Jeff Sickles | Enginuity Engineering Solutions |
| John Sikora | AECOM |
| Will Simmons | Wood |
| Dave Skuodas | Mile High Flood District |
| Chuck Smith | Douglas County Public Works Engineering |
| Shannon Smith | Town of Breckenridge |
| Kurt Smithgall | S2O Design & Engineering |
| Angela Snyder | Weld County Planning |
| Brent Soderlin | Commerce City |
| Mingi Sohn | City & County of Denver-Denver Wastewater |
| Scott Sorensen | Austin Civil Group, Inc. |
| Nate Soule | Lithos Engineering |
| Craig Spaulding | City of Rifle |
| William Spitz | Olsson |
| Garrett Sprouse | CDM Smith |
| Kent Steinhaus | Harris Kocher Smith |
| Chelsea Stern | Muller Engineering Company |
| Andy Stewart | City & County of Denver Public Works |
| Stoy Streepey | Clear Creek County |
| Doug Stremel | Jacobs |
| Travis Stroth | Stillwater Sciences |
| Chris Sturm | Colorado Water Conservation Board |
| Betsy Suerth | City of Delta |