| | Acc. No. | Year | Location | County | Observers |
| 1908-004 | 1908 |
Salida
| Chaffee | Edward Warren |
| 1914-001 | 1914 |
Near Byers
| Arapahoe | William Bergtold |
| 2013-110 | 1979 |
Chatfield State Park
| Jefferson | Hugh Kingery |
| 5-81-24 | 1981 |
Red Lion State Wildlife Area
| Logan | Peter Gent |
| 5-93-19 | 1982 |
Tamarack Ranch State Wildlife Area
| Logan | Bill Prather |
| 5-82-67 | 1982 |
Fort Collins
| Larimer | Kevin Cook, Kevin Cook |
| 5-87-5 | 1986 |
Two Buttes State Wildlife Area
| Baca | Beth Dillion |
| 5-91-12 | 1989 |
Tamarack Ranch State Wildlife Area
| Logan | Mark Nikas |
| 5-91-13 | 1991 |
Fountain Creek Regional Park
| El Paso | Mark Janos |
| 5-92-13 | 1992 |
Lower Latham Reservoir
| Weld | Joe Himmel |
| 5-96-6 | 1996 |
South Republican SWA
| Yuma | Bob Righter |
| 1998-008 | 1998 |
Valco Ponds
| Pueblo | Mark Janos |
| 1998-010 | 1998 |
Queens Reservoirs (Neeskah Reservoir area)
| Kiowa | Mark Janos |
| 1999-014 | 1999 |
Walden Ponds/Sawhill Ponds Complex
| Boulder | Tony Leukering |
| 2001-071 | 2001 |
Lower Latham Reservoir
| Weld | Tony Leukering, Chris Wood |
| 2003-092 | 2003 |
Valco Ponds
| Pueblo | Rich Miller |
| 2003-086 | 2003 |
Belmar Historic Park
| Jefferson | Karleen Schofield, Doug Faulkner, Bill Schmoker, Roger Linfield, Nathan Pieplow |
| 2008-155 | 2005 |
Banner Lakes State Wildlife Area
| Weld | Steve Larson |
| 2014-024 | 2005 |
Colorado Springs
| El Paso | Glenn Walbek, Bill Maynard |
| 2010-183 | 2005 |
Berthoud
| Larimer | Laurens Halsey |
| 2006-041 | 2006 |
Rocky Ford State Wildlife Area
| Otero | Brandon Percival, Cole Wild, Jim Beatty |
| 2006-120 | 2006 |
South Republican SWA
| Yuma | Pete Janzen |
| 2009-078 | 2009 |
John Martin Reservoir State Park
| Bent | Brad Steger |
| 2009-060 | 2009 |
Jumbo Reservoir State Wildlife Area
| Logan | Bill Kaempfer |
| 2009-084 | 2009 |
Jumbo Reservoir State Wildlife Area
| Logan | Eric Defonso |
| 2010-016 | 2010 |
Fountain Creek Regional Park
| El Paso | Bill Maynard, Brandon Percival, Cole Wild, Kara Lewantowicz |
| 2010-073 | 2010 |
Fort Collins
| Larimer | Rachel Hopper, Cole Wild, Dave Elens |
| 2011-087 | 2011 |
Greeley (except north end)
| Weld | Bill Kaempfer, Steve Mlodinow, Doug Faulkner, Sean Walters, Rudi Nuissl |
| 2012-092 | 2012 |
Florence
| Fremont | Bill Kosar |
| 2012-139 | 2012 |
Littleton
| Arapahoe | Pamela Ross |
| 2012-090 | 2012 |
TNC Brett Gray Ranch - S pond
| Lincoln | Bill Maynard |
| 2013-222 | 2013 |
Birdsall Rd pond
| El Paso | Bill Maynard, Brandon Percival, David Dowell, John Drummond, Richard Taylor |
| 2014-113 | 2014 |
Wray Area
| Yuma | Steven Mlodinow |
| 2014-152 | 2014 |
Neesopah Reservoir
| Kiowa | Steven Mlodinow |
| 2015-092 | 2015 |
Wheat Ridge Greenbelt
| Jefferson | Todd Deininger, Matt Crooks, David Suddjian, Chris Rurik |
| 2016-070 | 2016 |
Baxter Lake
| Weld | Steven Mlodinow |
| 2017-032 | 2017 |
Stalker Lake
| Yuma | Kathy Mihm Dunning |
| 2017-056 | 2017 |
Stalker Lake
| Yuma | Kathy Mihm Dunning |
| 2018-074 | 2018 |
Stalker Lake
| Yuma | Kathy Mihm Dunning |
| 2018-075 | 2018 |
Main Reservoir
| Jefferson | Santiago Tabares Erices |
| 2019-007 | 2019 |
Sell Lake
| Fremont | Derek Hudgins, Brandon K. Percival |
| 2020-018 | 2020 |
First Creek at Green Valley Ranch
| Denver | John Breitsch |
| 2020-056 | 2020 |
Valco Ponds
| Pueblo | Brandon K. Percival |
| 2020-076 | 2020 |
Valco Ponds
| Pueblo | Brandon K. Percival |
| 2021-018 | 2021 |
Bear Creek Greenbelt (Denver section)
| Denver | John Breitsch |
| 2022-027 | 2022 |
Pueblo City Park
| Pueblo | Brandon K. Percival |
| 2022-028 | 2022 |
Valco Ponds
| Pueblo | Brandon K. Percival |
| 2022-016 | 2022 |
Pella Crossing Park
| Boulder | Peter Gent |
| 2023-040 | 2023 |
Ramah
| El Paso | Karen Rau |