| | Acc. No. | Year | Location | County | Observers |
| 1908-001 | 1908 |
Woods Lake
| Eagle | P. Engelbrecht |
| 3-91-4 | 1991 |
Limon
| Lincoln | Bob Davies |
| 3-91-5 | 1991 |
Union Reservoir
| Weld | Mark Nikas |
| 3-91-6 | 1991 |
Chatfield State Park
| Jefferson | Dick Schottler, Mark Janos, Peter Gent |
| 3-91-7 | 1991 |
Antero Reservoir
| Park | Laurens Halsey, Chuck Loeffler |
| 3-92-5 | 1992 |
Neenoshe Reservoir
| Kiowa | Duane Nelson |
| 3-94-3 | 1994 |
Lake Henry
| Crowley | Mark Janos |
| 3-95-6 | 1995 |
Sweitzer Lake State Park
| Delta | Scott Jorgensen, Coen Dexter |
| 3-96-5 | 1996 |
Prewitt Reservoir State Wildlife Area
| Washington | Joey Kellner |
| 1997-009 | 1996 |
Barr Lake State Park
| Adams | Tony Leukering |
| 1999-008 | 1999 |
Blue Lake (Adobe Creek Reservoir)
| Bent | Nick Komar |
| 1999-009 | 1999 |
Quincy Reservoir
| Arapahoe | Paul Langendorfer |
| 2002-207 | 2002 |
Pueblo Reservoir area
| Pueblo | Nathan Pieplow |
| 2002-169 | 2002 |
Lathrop State Park
| Huerfano | Roger Linfield, Tony Leukering |
| 2005-065 | 2005 |
Windsor
| Weld | Nicholas Komar, Rachel Hopper, Cole Wild, Tony Leukering, Bill Schmoker |
| 2006-089 | 2006 |
Greenbriar Park, Fort Collins/near Greeley/Fossil Creek Res./Lake Loveland/Boyd Lake/Pond S. of Chatfield Res./McIntosh Lake
| Larimer & Boulder | Nick Komar, Nathan Pieplow, Rachel Hopper, Andrew Spencer, Bill Schmoker, Tony Leukering, Lee Farrell, Bill Maynard, Walter Szeliga |
| 2008-095 | 2008 |
Prewitt Reservoir State Wildlife Area
| Washington | Larry Griffin, Peter Gent, Bryan Guarante, Tony Leukering |
| 2009-021 | 2009 |
Totten Reservoir
| Montezuma | Jim Beatty |
| 2009-022 | 2009 |
Lake Meredith
| Crowley | Bill Maynard |
| 2010-113 | 2010 |
Highline Lake State Park
| Mesa | Cole Wild |
| 2011-046 | 2011 |
Kit Carson
| Cheyenne | Bill Kaempfer |
| 2016-024 | 2016 |
Lake Beckwith, Colorado City
| Pueblo | David Silverman, Brandon K. Percival, Cheryl Teuton, Kathy Mihm Dunning |
| 2016-027 | 2016 |
John Martin Reservoir State Park
| Bent | Brandon K. Percival, Kathy Mihm Dunning |
| 2016-029 | 2016 |
Walden Ponds/Sawhill Ponds Complex
| Boulder | John Rutenbeck |
| 2022-026 | 2022 |
Cherry Creek State Park
| Arapahoe & Jefferson | Cole Sage, Michael Lester |