| | Acc. No. | Year | Location | County | Observers |
| 5-72-31 | 1971 |
Barr Lake State Park
| Adams | Harold Holt, Inez Baker |
| 5-75-121 | 1975 |
North Poudre Res. #5
| Larimer | Michael Szymczak, Alex Cringan |
| 5-77-39 | 1977 |
S Platte River 3.8 Km W of Masters Bridge
| Weld | Gary Miller |
| 5-77-48 | 1977 |
Pueblo Reservoir area
| Pueblo | Chris Knight |
| 5-77-47 | 1977 |
Wellington Lakes
| Larimer | Mark Janos |
| 5-78-45 | 1978 |
Colorado Springs
| El Paso | Lynn Grace |
| 5-78-60 | 1978 |
Rocky Ford
| Otero | Mark Holmgren |
| 5-85-46 | 1985 |
Lower Latham Reservoir
| Weld | Jerry Cairo |
| 5-87-2 | 1987 |
Lake Henry
| Crowley | Dan Bridges |
| 5-87-3 | 1987 |
Lake Meredith
| Crowley | Mark Janos, Dan Bridges |
| 5-88-10 | 1987 |
Yuma
| Yuma | Frances Pusateri |
| 5-91-11 | 1991 |
Hidden Lake
| Adams | Philip Hayes, Duane Nelson |
| 5-93-70 | 1993 |
Huerfano Reservoir area
| Pueblo | David Silverman, Brandon Percival |
| 5-94-9 | 1994 |
San Luis Lakes
| Alamosa | John Rawinski, John Rawinski |
| 1998-007 | 1998 |
Union Reservoir
| Weld | Peter Plage, Tony Leukering |
| 1999-013 | 1999 |
Lake Holbrook
| Otero | Mark Janos |
| 2000-011 | 2000 |
Russell Lakes State Wildlife Area
| Saguache | Dean Lee, Rich Levad, Doug Faulkner |
| 2001-033 | 2001 |
John Martin Reservoir State Park
| Bent | Tony Leukering, Ric Olson, Rachel Kolokoff, Marshall Iliff |
| 2001-048 | 2001 |
Fort Collins
| Larimer | Rachel Hopper, Dave Leatherman, Joe Mammoser, Steve Dinsmore |
| 2002-168 | 2002 |
Lake Meredith
| Crowley | Stan Oswald, Larry Semo, Stan Oswald |
| 2006-210 | 2006 |
Alamosa National Wildlife Refuge
| Alamosa | John Rawinski |
| 2008-093 | 2008 |
Thurston Reservoir State Wildlife Area
| Prowers | Brandon Percival |
| 2008-094 | 2008 |
Jumbo Reservoir State Wildlife Area
| Sedgwick | Cole Wild |
| 2010-078 | 2010 |
Lower Latham Reservoir
| Weld | Larry Griffin, Cole Wild |
| 2010-033 | 2010 |
Holcim Marsh
| Fremont | Brandon Percival, Bill Maynard |
| 2011-501 | 2011 |
Chatfield State Park (Douglas Portion)
| Douglas | Roger Linfield |
| 2012-093 | 2012 |
Crownhill Park, Lakewood
| Jefferson | Peter Plage |
| 2013-167 | 2013 |
Holcim Wetlands
| Fremont | Brandon K Percival, John Drummond, Steven Mlodinow |
| 2013-171 | 2013 |
John Martin Reservoir State Park
| Bent | John Drummond, Bill Maynard |
| 2015-111 | 2015 |
Walden Ponds/Sawhill Ponds Complex
| Boulder | Dean E Shoup, Jamie Simo, Peter R. Gent, Andrew Bankert |
| 2016-079 | 2016 |
Walden Reservoir
| Jackson | Steven Mlodinow |
| 2018-052 | 2018 |
Riverbend Ponds Natural Area
| Larimer | Kathy Carroll |
| 2018-054 | 2018 |
Walden Ponds/Sawhill Ponds Complex
| Boulder | Steven Mlodinow |
| 2024-020 | 2024 |
Two Buttes SWA
| Baca | Luke Pheneger |