| | Acc. No. | Year | Location | County | Observers |
| 23-80-17 | 1980 |
Sloan's Lake
| Denver | Charlie Chase, Mark Holmgren, Robert Andrews |
| 23-81-7 | 1981 |
Union Reservoir
| Weld | Mark Holmgren, Mike Middleton, T. Folwer |
| 23-82-71 | 1982 |
Sloan's Lake
| Denver | B.J. Rose |
| 23-85-1 | 1985 |
Cherry Creek State Park
| Arapahoe | Judy Ward |
| 23-90-23 | 1990 |
Runyon Lake State Wildlife Area
| Pueblo | David Silverman, Mark Janos |
| 23-90-24 | 1990 |
Pueblo City Park
| Pueblo | Mark Janos |
| 23-92-52 | 1991 |
Union Reservoir
| Weld | John Prather |
| 23-93-7 | 1992 |
Mack
| Mesa | Rich Levad |
| 23-93-35 | 1992 |
Cherry Creek State Park
| Arapahoe | Steve Stachowiak |
| 23-92-9 | 1992 |
Pueblo Reservoir area
| Pueblo | Mark Janos |
| 23-94-32 | 1994 |
Pueblo Reservoir area
| Pueblo | Mark Janos |
| 23-96-25 | 1996 |
Cherry Creek State Park
| Arapahoe | Jack Reddall |
| 1998-059 | 1996 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 1997-037 | 1997 |
Union Reservoir
| Weld | Paul Lehman |
| 1998-060 | 1998 |
Union Reservoir
| Weld | Paul Sweet |
| 1999-056 | 1999 |
Union Reservoir
| Weld | Tony Leukering |
| 1999-057 | 1999 |
Union Reservoir
| Weld | John Vanderpoel, Tony Leukering |
| 1999-058 | 1999 |
Cherry Creek State Park
| Arapahoe | John Vanderpoel, Peter Gent, Sharon Dooley, Tony Leukering |
| 1999-059 | 1999 |
Union Reservoir
| Weld | John Vanderpoel |
| 2000-051 | 2000 |
South Platte Greenway Gravel Pits (south section)
| Adams | Tony Leukering |
| 2001-144 | 2001 |
Jim Hamm Nature Area
| Boulder | Karleen Schofield |
| 2001-019 | 2001 |
Pastorius State Wildlife Area
| La Plata | Susan Allerton, Peter Derven |
| 2001-204 | 2001 |
Chatfield State Park
| Jefferson & Douglas | Andrew Spencer |
| 2006-176 | 2001 |
South Republican SWA
| Yuma | Andrew Spencer |
| 2002-030 | 2002 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2002-157 | 2002 |
Seeley Reservoir SWA and nearby lakes
| Weld | Tony Leukering |
| 2002-208 | 2002 |
Runyon Lake State Wildlife Area
| Pueblo | Rich Miller |
| 2003-062 | 2003 |
Pueblo Reservoir area
| Pueblo | Tony Leukering |
| 2004-109 | 2004 |
Jim Hamm Nature Area
| Boulder | Glenn Walbek |
| 2004-138 | 2004 |
Fort Collins
| Larimer | Kevin Keirn, Nick Komar |
| 2005-002 | 2005 |
NW portion of Thomas Reservoir along 119th St.
| Boulder | Bill Kaempfer |
| 2005-006 | 2005 |
Crown Hill Park/Lake/Cemetery
| Jefferson | Larry Semo, Tony Leukering |
| 2005-122 | 2005 |
Pueblo Reservoir area
| Pueblo | Brandon K Percival, Brandon K Percival, Brandon K Percival, Brandon K Percival |
| 2005-117 | 2005 |
Strauss Cabin Lake
| Larimer | Nick Komar |
| 2005-138 | 2005 |
Cherry Creek State Park
| Arapahoe | Glenn Walbek |
| 2005-156 | 2005 |
Pueblo Reservoir area
| Pueblo | Brandon K. Percival |
| 2006-013 | 2006 |
Pueblo Reservoir area
| Pueblo | Brandon K Percival |
| 2006-020 | 2006 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2006-167 | 2006 |
Pueblo Reservoir area
| Pueblo | Bill Maynard, Brandon Percival, Tony Leukering |
| 2006-170 | 2006 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2007-005 | 2007 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2008-003 | 2008 |
Pueblo Reservoir area
| Pueblo | Bill Maynard |
| 2008-019 | 2008 |
Pueblo Reservoir area
| Pueblo | Brandon K Percival |
| 2008-025 | 2008 |
Horseshoe Lake
| Larimer | Nick Komar |
| 2014-019 | 2008 |
Cherry Creek State Park
| Arapahoe | Tony Leukering |
| 2008-136 | 2008 |
Cherry Creek State Park
| Arapahoe | Andrew Spencer |
| 2008-141 | 2008 |
John Martin Reservoir State Park
| Bent | Tony Leukering |
| 2008-142 | 2008 |
Ordway
| Crowley | Tony Leukering |
| 2008-145 | 2008 |
Pueblo Reservoir area
| Pueblo | Tony Leukering |
| 2008-146 | 2008 |
Pueblo Reservoir area
| Pueblo | Tony Leukering |
| 2008-154 | 2008 |
Prospect Lake
| El Paso | Bill Maynard, Larry Semo |
| 2009-004 | 2009 |
Valmont Reservoir complex
| Boulder | Ted Floyd |
| 2009-009 | 2009 |
Jumbo Reservoir State Wildlife Area
| Sedgwick | Cole Wild |
| 2009-110 | 2009 |
Pueblo Reservoir area
| Pueblo | Brandon Percival |
| 2009-099 | 2009 |
Valmont Reservoir complex
| Boulder | Ted Floyd, Bill Schmoker |
| 2010-012 | 2010 |
Pueblo Reservoir area
| Pueblo | Bill Maynard, Brandon Percival |
| 2010-153 | 2010 |
Cherry Creek State Park
| Arapahoe | John Drummond, Bill Maynard |
| 2011-030 | 2011 |
Valmont Reservoir complex
| Boulder | Ted Floyd |
| 2011-223 | 2011 |
Chatfield SP marina
| Douglas | Doug Faulkner |
| 2011-225 | 2011 |
N Weld County Landfill
| Weld | Steven Mlodinow |