| Date | Transaction |
| 02-28-2112 | Dave Powers has retired from football. |
| 09-09-2108 | The Oakland Jets have waived Dave Powers. |
| 09-03-2108 | The Oakland Jets have moved Paul Kraynak, Hal Molesworth, Otto Jenkins, and Metz Rodgers to the active roster. The Oakland Jets have moved Dave Powers, Dan Walker, and Wayne Simpson to the inactive roster. |
| 12-12-2107 | The Oakland Jets have acquired Dave Powers from the waiver wire. |
| 09-12-2107 | The Anaheim Pinky Swear have waived Dave Powers. |
| 09-06-2105 | The Anaheim Pinky Swear have placed Dave Powers on the trade block. |
| 09-08-2104 | The Anaheim Pinky Swear have moved Dave Powers to the active roster. The Anaheim Pinky Swear have moved Joe Whipple to the inactive roster. |
| 09-08-2104 | The Anaheim Pinky Swear have acquired Dave Powers from the waiver wire. |
| 09-01-2104 | The St. Louis Cardinals have moved Jack Yezerski to the active roster. |
| 09-01-2104 | The St. Louis Cardinals have waived Dave Powers. |
| 09-01-2104 | The St. Louis Cardinals have moved Bernie Walker, David Cardwell, Les Bowens, and Jim Albrecht to the active roster. The St. Louis Cardinals have moved Gary Jewett, Gerome Heldt, Paul Grayson, and Dave Powers to the inactive roster. |
| 04-27-2104 | The St. Louis Cardinals have moved Dave Powers to the active roster. The St. Louis Cardinals have moved Bernie Walker to the inactive roster. |
| 04-27-2104 | The St. Louis Cardinals have acquired Dave Powers from the waiver wire. |
| 09-09-2103 | The Calgary Royals have automatically waived Dave Powers to comply with the 53-man roster limit. |
| 09-03-2103 | The Calgary Royals have moved Lloyd Dunn, Fred Frost, Jim Hinkle, Bob Baker, Stan Taylor, Curt McKinney, Bob Ward, Henry Clark, Rocco Romano, and Don Coleman to the active roster. The Calgary Royals have moved Ed Williams, Claude Moore, Joe Robison, Dave Powers, James McCormick, Jay Brewer, Michael Marchi, Gasper Ray, and Johnny Rice to the inactive roster. |
| 08-20-2102 | The Calgary Royals have placed Dave Powers on the trade block. |
| 08-07-2102 | The Calgary Royals have moved Gerome Heldt, Mike Adkins, Todd Williams, Claude Moore, Dave Powers, Michael Marchi, Jeff Douglas, Byron Harper, Clarence Barbaro, Milford Morris, James McCormick, Chris McGee, and Jay Brewer to the active roster. The Calgary Royals have moved Will Johnson, Tim Stone, Maurice Lee, Ernest Haller, Mike Godwin, Stan Taylor, Curt McKinney, Henry Clark, Don Coleman, Derrick Gordon, Jim Hinkle, Bibbles Pennington, and Jay McNeil to the inactive roster. |
| 01-02-2102 | The Calgary Royals have moved Harold Harris, Ernest Haller, Keith Davis, Mike Godwin, and Derrick Gordon to the active roster. The Calgary Royals have moved Gerome Heldt, Todd Williams, Dave Powers, Jeff Douglas, and Clarence Barbaro to the inactive roster. |
| 08-08-2101 | The Calgary Royals have moved Mike Adkins, Johnny Murphy, Ronnie Rodak, Buddy Provost, Clarence Barbaro, and Dave Powers to the active roster. The Calgary Royals have moved Derrick Gordon, Bibbles Pennington, Jay McNeil, Tim Stone, Rocco Romano, and Henry Clark to the inactive roster. |
| 05-01-2101 | The Calgary Royals have moved Gerome Heldt, Chuck Jenkins, Freddie Lawler, and Jim Mincy to the active roster. The Calgary Royals have moved Walt Lee, Dave Powers, Cookie Brown, Jerry Hawkins, Eric Neville, and Wade Williams to the inactive roster. |
| 12-19-2100 | The Calgary Royals have moved Dave Powers to the active roster. |
| 11-15-2100 | The Calgary Royals have moved Walt Lee, Ernest Haller, Jerry Hawkins, Wade Williams, and Jay McNeil to the active roster. The Calgary Royals have moved Gerome Heldt, Mike Adkins, Chuck Jenkins, Dave Powers, and Freddie Lawler to the inactive roster. |
| 11-08-2100 | The Calgary Royals have moved Mike Adkins, Dave Powers, Freddie Lawler, Chuck Jenkins, and Gerome Heldt to the active roster. The Calgary Royals have moved Jerry Hawkins, Ernest Haller, Wade Williams, Jay McNeil, and Walt Lee to the inactive roster. |
| 09-05-2100 | The Calgary Royals have moved Harold Harris, Tony Younger, Ernest Haller, Henry Clark, Eric Neville, Jim Hinkle, Bibbles Pennington, Jay McNeil, and Jim Gayer to the active roster. The Calgary Royals have moved Fred Williamson, Mike Adkins, Chuck Jenkins, Bob Meyer, Dave Powers, Jim McConnell, Freddie Lawler, and Jim Mincy to the inactive roster. |
| 08-09-2100 | The Calgary Royals have moved Leon Johnson, Fred Savage, Stan Lee, Chuck Jenkins, Bob Meyer, Odell "Ironman" Simonson, Dave Powers, Jim McConnell, Freddie Lawler, and Mike Howard to the active roster. The Calgary Royals have moved Tony Younger, Tim Stone, Ernest Haller, Ed Milton, Henry Clark, Cookie Brown, Bobby Senser, Jim Hinkle, Bibbles Pennington, and Jim Gayer to the inactive roster. |
| 01-04-2100 | The Calgary Royals have moved Ernest Haller, Derrick Hamer, Ed Milton, Tim Stone, and Eric Neville to the active roster. The Calgary Royals have moved Jim Mincy, Odell "Ironman" Simonson, Fred Savage, Stan Lee, and Dave Powers to the inactive roster. |
| 12-07-2099 | The Calgary Royals have moved Fred Savage, Stan Lee, and Dave Powers to the active roster. The Calgary Royals have moved Tim Stone, Ernest Haller, and Ed Milton to the inactive roster. |
| 08-17-2099 | The Calgary Royals have acquired Dave Powers from the waiver wire. |
| 08-10-2099 | The Sacramento Solars have waived Dave Powers. |
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