| | Acc. No. | Year | Location | County | Observers |
| 1963-001 | 1963 |
Cherry Creek State Park
| Arapahoe | Alfred Bailey |
| 22-73-45 | 1973 |
De Weese Reservoir
| Custer | Steve Larson, Van Truan |
| 22-73-124 | 1973 |
Prospect Reservoir
| Weld | Jack Reddall |
| 22-75-147 | 1975 |
Cherry Creek State Park
| Arapahoe | Jack Reddall, Robert Andrews, William Lybarger |
| 22-86-42 | 1985 |
Jackson Reservoir
| Morgan | Laurens Halsey |
| 22-86-1 | 1985 |
Cherry Creek State Park
| Arapahoe | Laurens Halsey |
| 22-91-30 | 1991 |
Barr Lake State Park
| Adams | Lynda Hedl, Bill Fink |
| 22-91-31 | 1991 |
Pueblo Reservoir area
| Pueblo | Robert Dickson, Mark Janos, Peter Gent |
| 22-94-29 | 1994 |
Lake Henry
| Crowley | Mark Janos |
| 1996-500 | 1996 |
Douglas Reservoir
| Larimer | David Leatherman |
| 22-96-18 | 1996 |
Cherry Creek State Park
| Arapahoe | John Vanderpoel |
| 1999-046 | 1999 |
Stagecoach Reservoir State Park
| Routt | Doug Faulkner |
| 2000-042 | 1999 |
Standley Lake
| Jefferson | Tony Leukering |
| 1999-048 | 1999 |
Pueblo Reservoir area
| Pueblo | David Silverman, Tony Leukering |
| 1999-049 | 1999 |
Cherry Creek State Park
| Arapahoe | Bob Brown, Tony Leukering |
| 2007-064 | 2000 |
Jackson Reservoir
| Morgan | Tony Leukering, Larry Semo |
| 2001-155 | 2000 |
South Republican SWA
| Yuma | Tony Leukering |
| 2000-045 | 2000 |
Chatfield State Park
| Douglas & Jefferson | Ric Olson, Larry Semo |
| 2001-168 | 2001 |
Queens Reservoirs (Neeskah Reservoir area)
| Kiowa | Tony Leukering |
| 2001-199 | 2001 |
Windsor Reservoir
| Weld | Joe Fontaine, Tony Leukering |
| 2003-116 | 2003 |
Chatfield State Park
| Jefferson & Douglas | Randall Siebert, Bill Schmoker |
| 2005-093 | 2005 |
Cherry Creek State Park
| Arapahoe | Andrew Spencer |
| 2006-121 | 2006 |
Cherry Creek State Park
| Arapahoe | Glenn Walbek |
| 2006-132 | 2006 |
Cherry Creek State Park
| Arapahoe & Douglas | Glenn Walbek, Bill Maynard, Brandon Percival |
| 2008-116 | 2008 |
Jackson Reservoir
| Morgan | Bill Kaempfer, Christian Nunes, Andrew Spencer |
| 2008-123 | 2008 |
Barr Lake State Park
| Adams | Andrew Spencer |
| 2011-168 | 2011 |
Chatfield State Park
| Jefferson & Douglas | Bill Maynard, Paul Hurtado |
| 2013-169 | 2013 |
Antero Reservoir
| Park | Eric DeFonso, John Drummond, Bill Maynard |
| 2014-039 | 2013 |
Blue Lake (Adobe Creek Reservoir)
| Kiowa | Duane Nelson |
| 2014-027 | 2013 |
Chatfield State Park
| Douglas | Glenn Walbek, Kris Petersen |
| 2016-097 | 2016 |
Chatfield State Park (Douglas Portion)
| Douglas | Scott Somershoe |
| 2023-049 | 2023 |
Windsor
| Weld | David Leatherman |
| 2023-070 | 2023 |
Pueblo Reservoir
| Pueblo | Brandon Percival |