Below is a current list of registrants.
| Full Name | Company |
|---|---|
| Doug Mahan | Colorado Water Conservation Board |
| Bennet Madigan | Matrix Design Group |
| Rocky Macsalka | AECOM |
| Joseph Machala | CDM Smith |
| Morgan Lynch | Mile High Flood District |
| Drake Ludwig | Wright Water Engineers |
| Cynthia Love | SEMSWA |
| E. John Loranger | Wood |
| Katie Lopez | Parsons |
| Michael Lopes | Calibre Engineering |
| Elysa Loewen | Loewen Engineering, Inc. |
| Daniel Loewen | Loewen Engineering, Inc. |
| Yu Liu | Jacobs |
| Shaojun Liu | Bai Engineers |
| Ben Liu | Matrix Design Group |
| Kevin Lewis | City & County of Denver |
| Mike Lesser | Contech Engineered Solutions LLC |
| Hayes Lenhart | Wright Water Engineers |
| Brian LeDoux | ICON Engineering, Inc. |
| Alan Leak | RESPEC |
| Adrianna Lash | AbTech Industries |
| Adam Lancaster | City of Canon City |
| Frans Lambrechtsen | Jacobs |
| Crystal Lambert | Gunnison County |
| Dean Lamanna | Triton Environmental |
| Adam Lacey | RESPEC |
| Drew Kustusch | Engineering Resource Associates, Inc. |
| Andy Kuster | SEMSWA |
| Bryan Kucinski | Nilex, Inc |
| Laura Kroeger | Mile High Flood District |
| Christopher Kroeger | Muller Engineering Company |
| Dave Krickbaum | Olsson |
| Jenelle Kreutzer | ERO Resources |
| Robert Krehbiel | Matrix Design Group |
| David Kotz | SGM |
| Kevin Koryto | City of Boulder |
| John Kornfeld | Rhino Engineering, Inc. |
| Catherine Kornbrust | BT Construction, Inc. |
| Michael Kohn | U.S. Geological Survey |
| Colleen Koenig | HDR |
| Greg Koch | Anderson Consulting Engineers, Inc. |
| William (Matt) Knight | City of Lafayette |
| Jack Knaub | Hanes Geo Components |
| Tanya Klinefelter | Naranjo Civil Constructors Inc. |
| Katherine Klavon | WSP |
| Aaron Kirchner | City of Westminster |
| Laura Kindt | AECOM |
| Katherine Kerstiens | Dewberry |
| Marc Kenney | River City Consultants, Inc |
| Cassie Kaslon | Valerian |