| | Acc. No. | Year | Location | County | Observers |
| 2010-010 | 1896 |
Denver
| Denver | William Harry Bergtold |
| 10-74-180 | 1974 |
Boulder Creek (downtown section)
| Boulder | Bruce Webb, Steve Larson |
| 10-76-22 | 1976 |
South Republican SWA
| Yuma | Mike Moulton |
| 10-76-47 | 1976 |
Hale area
| Yuma | Jack Reddall |
| 10-76-97 | 1976 |
Barr Lake State Park
| Adams | Bob Andrews |
| 10-77-73 | 1977 |
Fort Collins
| Larimer & Weld | Brian Millsap |
| 10-79-4 | 1978 |
Chatfield State Park
| Jefferson | Hugh Kingery |
| 10-92-104 | 1992 |
Pueblo
| Pueblo | Robert Dickson, Mark Janos |
| 10-93-55 | 1993 |
Ireland Reservoir #5
| Weld | Jake Edge, John Vanderpoel |
| 10-93-61 | 1993 |
Fort Collins
| Larimer | Dave Leatherman |
| 10-93-73 | 1993 |
Horsetooth Reservoir
| Larimer | Barbara & Franklin Haas |
| 10-94-19 | 1994 |
Pueblo
| Pueblo | Mark Janos |
| 1998-033 | 1998 |
Rocky Ford
| Otero | Mark Janos |
| 1998-035 | 1998 |
Gregory Canyon
| Boulder | Peter Gent |
| 1999-030 | 1999 |
Fort Collins
| Larimer | Dave Leatherman |
| 2000-026 | 2000 |
South Platte Greenway Gravel Pits (north section)
| Adams | Tony Leukering, Karleen Schofield, Ric Olson |
| 2000-027 | 2000 |
Cherry Creek State Park
| Arapahoe | David Quesenberry, Karleen Schofield |
| 2005-085 | 2005 |
South Republican SWA
| Yuma | Larry Semo |
| 2010-007 | 2010 |
Kodak Watchable State Wildlife Area and Poudre River Trail (western section)
| Weld | Cole Wild, Nathan Pieplow, Bill Schmoker, Larry Semo |
| 2015-099 | 2015 |
North Sterling State Park
| Logan | Bill Kaempfer, John Vanderpoel |
| 2023-045 | 2023 |
Lamar
| Prowers | Jill Smith |