| | Acc. No. | Year | Location | County | Observers |
| 1875-001 | 1875 |
Colorado Springs
| El Paso | Unknown |
| 5-91-9 | 1991 |
Blue Lake (Adobe Creek Reservoir)
| Kiowa & Bent | Dick Schottler, Karl Overman, Mark Janos, Peter Gent, Dan Bridges |
| 5-93-72 | 1993 |
Queens Reservoirs (Neeskah Reservoir area)
| Kiowa | Thomas Kihn |
| 5-94-10 | 1994 |
Lake Holbrook
| Otero | Brandon Percival, Mark Janos, Peter Gent |
| 2000-013 | 2000 |
Lake Cheraw
| Otero | Mark Janos |
| 2001-077 | 2001 |
Neenoshe Reservoir
| Kiowa & Bent | Dave Leatherman, Tony Leukering, Chris Wood |
| 2002-135 | 2002 |
Prewitt Reservoir State Wildlife Area
| Washington | Kent Nickell |
| 2004-115 | 2004 |
Colorado City and Rye
| Pueblo | David Silverman |
| 2008-072 | 2008 |
Neenoshe Reservoir
| Kiowa | Andrew Spencer |
| 2009-070 | 2009 |
Westcliffe and Silver Cliff
| Custer | Bill Maynard, Brandon Percival, Lisa Edwards |
| 2010-121 | 2010 |
John Martin Reservoir State Park
| Bent | Duane Nelson, Cole Wild |
| 2011-052 | 2011 |
Huerfano Reservoir area
| Pueblo | David Silverman, Bill Kaempfer, Brandon Percival |
| 2012-085 | 2012 |
Lake Cheraw
| Otero | Johan Nilsson, David Chartier, Brandon Percival |
| 2013-265 | 2013 |
Lake Meredith
| Crowley | David Dowell |
| 2014-038 | 2013 |
John Martin Reservoir State Park
| Bent | Jane Stulp |
| 2020-031 | 2020 |
Jackson Reservoir
| Morgan | Joey Kellner |
| 2023-014 | 2023 |
Clifton Nature Park
| Mesa | Linda Chittum |