| | Acc. No. | Year | Location | County | Observers |
| 1944-001 | 1944 |
Sterling
| Logan | Allan Phillips |
| 1-82-2 | 1981 |
Chatfield State Park
| Douglas & Jefferson | Jack Reddall, Mark Holmgren, Robert Andrews |
| 1-83-1 | 1982 |
Chatfield State Park
| Douglas & Jefferson | Mark Holmgren |
| 1-87-1 | 1987 |
Pueblo Reservoir area
| Pueblo | Mark Janos |
| 1-88-25 | 1988 |
Hamilton Reservoir
| Larimer | Dave Leatherman, Peter Gent |
| 1-96-3 | 1991 |
Hamilton Reservoir
| Larimer | Michael Rogers |
| 1-92-50 | 1991 |
Union Reservoir
| Weld | John Prather |
| 1-91-3 | 1991 |
Chatfield State Park
| Douglas & Jefferson | Joey Kellner |
| 1-92-7 | 1992 |
Pueblo Reservoir area
| Pueblo | Mark Janos |
| 1-95-3 | 1994 |
Pueblo Reservoir area
| Pueblo | Mark Janos, Brandon Percival |
| 1-95-2 | 1995 |
Pueblo Reservoir area
| Pueblo | Mark Janos, Brandon Percival |
| 1997-005 | 1997 |
Chatfield State Park
| Jefferson | J. B. Hayes, Joey Kellner, Peter Gent |
| 1998-003 | 1998 |
Pueblo Reservoir area
| Pueblo | David Quesenberry, Mark Janos, Tony Leukering |
| 1999-004 | 1999 |
Pueblo Reservoir area
| Pueblo | Mark Janos |
| 2000-004 | 2000 |
Big Johnson Reservoir
| El Paso | Larry Norris, Dunning Idle, Greg Lasley |
| 2002-093 | 2002 |
Boyd Lake State Park
| Larimer | Bill Schmoker, Andrew Spencer |
| 2002-110 | 2002 |
Chatfield State Park
| Jefferson & Douglas | Bill Schmoker |
| 2005-113 | 2005 |
Standley Lake
| Jefferson & Douglas | Doug Faulkner, Andrew Spencer |
| 2005-135 | 2005 |
Chatfield State Park
| Douglas & Pueblo | Andrew Spencer, Bill Maynard, Brandon K Percival, Brandon K Percival |
| 2012-099 | 2005 |
Highline Lake State Park
| Mesa | Larry Arnold |
| 2006-182 | 2006 |
Spinney Mountain State Park
| Park | Andrew Spencer |
| 2006-162 | 2006 |
Prince Lakes, Erie and Thomas Reservoirs
| Boulder | Bill Schmoker, Peter Gent, Walter Szeliga, Bill Maynard |
| 2007-090 | 2007 |
MacFarlane Reservoir
| Jackson | Andrew Spencer |
| 2008-002 | 2008 |
Pueblo Reservoir area
| Pueblo | Brandon K Percival, Bill Maynard, Bill Schmoker, Tony Leukering, Brandon K Percival |
| 2008-128 | 2008 |
Antero Reservoir
| Park | Bill Maynard |
| 2010-114 | 2010 |
Blue Mesa Reservoir
| Gunnison | Cole Wild |
| 2014-172 | 2014 |
Boyd Lake State Park
| Larimer | Steven Mlodinow, Kris Petersen |
| 2014-176 | 2014 |
Chatfield State Park (Douglas Portion)
| Douglas | Joey Kellner, John Drummond |
| 2018-033 | 2018 |
Blue Mesa Reservoir
| Gunnison | Kathy Mihm Dunning |
| 2018-038 | 2018 |
Pueblo Reservoir area
| Pueblo | Bill Maynard |
| 2018-018 | 2018 |
Dillon Reservoir
| Summit | Ryan Bushong |
| 2020-092 | 2020 |
Chatfield State Park
| Jefferson | Doug Faulkner |
| 2020-008 | 2020 |
Standley Lake
| Jefferson | Donna Stumpp |
| 2020-093 | 2020 |
| Adams | Doug Faulkner |
| 2022-025 | 2022 |
Pueblo Reservoir area
| Pueblo | Brandon K. Percival, Sue Riffe |
| 2022-067 | 2022 |
Cherry Creek State Park
| Arapahoe | Cole Sage |
| 2023-069 | 2023 |
Pueblo Reservoir
| Pueblo | Brandon Percival |
| 2024-035 | 2024 |
Eleven Mile State Park
| Park | Alan Ketcham |