| | Acc. No. | Year | Location | County | Observers |
| 10-80-83 | 1980 |
Chatfield State Park
| Douglas | Kate Kittleman, Bob Andrews |
| 10-91-23 | 1991 |
Carrizo Canyon Picnic Area
| Baca | Rupert Higgins |
| 2001-032 | 2001 |
Lightner Creek Road
| La Plata | Peter Derven, Susan Allerton |
| 2001-047 | 2001 |
Trinidad Lake State Park
| Las Animas | Glenn Walbek, Tony Leukering, Alan Versaw |
| 2001-102 | 2001 |
East of Montrose
| Montrose | Steve Dinsmore |
| 2005-023 | 2005 |
Two Buttes State Wildlife Area
| Baca | Marshall Iliff |
| 2006-123 | 2006 |
Canon City
| Fremont | Bill Maynard, Andrew Spencer, Nathan Pieplow, Peter Gent |
| 2007-113 | 2007 |
Colorado River State Park (James M. Robb)
| Mesa | Roger Linfield |
| 2009-050 | 2009 |
Hotchkiss Federal Fish Hatchery
| Delta | Jason Beason |
| 2010-028 | 2010 |
Fountain Creek Regional Park
| El Paso | Bill Maynard, Brandon Percival, Lisa Edwards |
| 2011-093 | 2011 |
Confluence Park
| Delta | Michael O'Brien |
| 2013-249 | 2013 |
Delta
| Delta | Jason Beason |
| 2015-044 | 2015 |
Pueblo Reservoir area
| Pueblo | Brandon K. Percival |
| 2020-033 | 2020 |
Manitou Lake and Trout Creek
| Teller | Kevin Ash, Alan Ketcham, Rachel Hopper |
| 2021-019 | 2021 |
Chico Basin Ranch
| El Paso | Jacqui Geiselman, David Dowell |
| 2023-012 | 2023 |
Wellsville
| Fremont | Chris Brown |