| | Acc. No. | Year | Location | County | Observers |
| 56-83-59 | 1983 |
Colorado Springs
| El Paso | Bill Maynard, Ed Curry, Barry Knapp, Laurens Halsey |
| 56-83-60 | 1983 |
Boulder
| Boulder | Marge Foland, Bob Jickling |
| 2012-192 | 2012 |
Bear Creek Lake Park
| Jefferson | Mike Henwood, Bill Maynard, Bill Schmoker, Bill Kaempfer, Brandon K Percival, Ira Sanders, Shawn Billerman, Sean Walters |
| 2022-051 | 2022 |
Lamar
| Prowers | Jill Smith |
| 2023-061 | 2023 |
Colorado Springs
| El Paso | David Resch, Robert Raker, Aaron Driscoll |
| 2024-009 | 2024 |
Loveland
| Larimer | Laura Stump |