| | Acc. No. | Year | Location | County | Observers |
| 7-85-15 | 1985 |
Neesopah Reservoir
| Kiowa | Dan Bridges, Peter Gent |
| 1998-011 | 1998 |
Bayfield
| La Plata & Alamosa | Loretta Annala, Joey Kellner, John and Lisa Rawinski |
| 2000-014 | 2000 |
Barr Lake State Park
| Adams | Doug Faulkner, Larry Semo, Joe Mammoser |
| 2001-054 | 2001 |
John Martin Reservoir State Park
| Bent | Duane Nelson, Marie Cecile Lee |
| 2004-123 | 2004 |
Pueblo Reservoir area
| Pueblo | Brandon K. Percival |
| 2006-029 | 2006 |
Tamarack Ranch State Wildlife Area
| Logan | Cole Wild, Nathan Pieplow, Bill Schmoker |
| 2006-112 | 2006 |
Pueblo Reservoir area
| Pueblo | Brandon Percival, Andrew Spencer |
| 2013-182 | 2013 |
North River Road, near Cattail Golf Course
| Alamosa | Polly Neldner |
| 2014-149 | 2014 |
Horseshoe Lake
| Larimer | Michael Britten |
| 2017-044 | 2017 |
Clear Creek Valley Park
| Adams | Zachary Schiff, Mark Minner-Lee, Peter R. Gent, George Mayfield, Christine Alexander, Doug Faulkner |
| 2018-072 | 2018 |
Vans Marsh at Road JJ
| Bent | David Suddjian |
| 2022-029 | 2022 |
Fountain Creek Regional Park
| El Paso | Melvin Goff, Aaron Driscoll, Jenyva Fox |
| 2022-030 | 2022 |
Golden Ponds Park and Nature Area
| Boulder | Sarah Spotten, Peter Gent, Jeff Percell |
| 2023-022 | 2023 |
Brighton
| Adams | Rich Reading |