| | Acc. No. | Year | Location | County | Observers |
| 17-74-24 | 1965 |
Fort Morgan
| Morgan | Allegra Collister, Sylvia Brockner |
| 17-81-9 | 1981 |
Loveland
| Larimer | Dave Leatherman |
| 17-83-26 | 1983 |
Walden Ponds/Sawhill Ponds Complex
| Boulder | Peter Gent, Laurens Halsey, Doug Ward |
| 17-84-42 | 1984 |
Clifton
| Mesa | Rich Levad |
| 17-87-17 | 1987 |
Craig
| Moffat | Judy Ward |
| 17-92-58 | 1992 |
Totten Reservoir
| Montezuma | Alan Versaw |
| 17-93-26 | 1993 |
Huerfano Reservoir area
| Pueblo | David Silverman, Robert Dickson |
| 2002-050 | 2002 |
Saint Vrain State Park
| Weld | Christie Owens, Richard Mendez, Rachel Hopper |
| 2014-079 | 2014 |
Not Specified
| Otero | Bill Maynard |
| 2017-073 | 2017 |
Pond near Standley Lake, Westminster
| Jefferson | Dina Baker |
| 2018-058 | 2018 |
Cottonwood Hollow Natural Area
| Larimer | Robert Beauchamp, Joe Mammoser, Kevin Keirn, Sue Riffe |
| 2018-085 | 2018 |
CSU Environmental Learning Center
| Larimer | Andrew Bankert |
| 2019-030 | 2019 |
Wellington State Wildlife Area/Cobb Lake State Wildlife Area
| Larimer | Rachel Hopper, Andrew Bankert, Luke Pheneger |
| 2022-034 | 2022 |
Colorado Springs
| El Paso | Tanja Britton, Melvin Goff, Brandon K. Percival, John Drummond, Aaron Driscoll |