| Date | Transaction |
| 02-28-1988 | Fred Rivera has retired from football. |
| 08-10-1986 | The Boston Bronze Age have waived Fred Rivera. |
| 11-04-1985 | The Boston Bronze Age have moved Fred Rivera to the active roster. |
| 10-28-1985 | The Boston Bronze Age have moved Bert Frost to the active roster. The Boston Bronze Age have moved Fred Rivera to the inactive roster. |
| 10-28-1985 | The Boston Bronze Age have moved Fred Rivera to the active roster. The Boston Bronze Age have moved Bert Frost to the inactive roster. |
| 10-28-1985 | The Boston Bronze Age have acquired Fred Rivera from the waiver wire. |
| 09-02-1985 | The Montreal Mastodon have moved Joe Eubanks and Len Taylor to the active roster. The Montreal Mastodon have moved James Lunceford to the inactive roster. |
| 09-02-1985 | The Montreal Mastodon have waived Fred Rivera. |
| 08-05-1985 | The Montreal Mastodon have moved Jerry Hasbrouck, Ricky Silvan, Brad Pierre, and Rudy Craver to the active roster. The Montreal Mastodon have moved Leon Zatechka, Tom Sapp, Fred Rivera, Jeff Panelli, Andy Zeller, Shaun Simpson, and Joe Roberts to the inactive roster. |
| 08-19-1984 | The Montreal Mastodon have moved Fred Rivera to the active roster. |
| 08-06-1984 | The Montreal Mastodon have moved Ty Spellacy, Don Mundee, and Ron Pettyjohn to the active roster. The Montreal Mastodon have moved Joe Roberts, Fred Rivera, and Steve Van Dyke to the inactive roster. |
| 11-06-1983 | The Montreal Mastodon have moved Fred Rivera and Shaun Simpson to the active roster. The Montreal Mastodon have moved Walter Jenkins and Andy Zeller to the inactive roster. |
| 10-23-1983 | The Montreal Mastodon have moved Walter Jenkins and Elijah Smith to the active roster. The Montreal Mastodon have moved Fred Rivera and Scott Maxie to the inactive roster. |
| 10-23-1983 | Fred Rivera of the Montreal Mastodon is injured with a knee derangement and is expected to be out for approximately 25 days. |
| 11-29-1981 | The Winnipeg Mastodon have moved Fred Rivera to the active roster. The Winnipeg Mastodon have moved Clarence Squyres to the inactive roster. |
| 11-16-1981 | The Winnipeg Mastodon have moved Bruce Jauron to the active roster. The Winnipeg Mastodon have moved Fred Rivera to the inactive roster. |
| 11-08-1981 | Fred Rivera of the Winnipeg Mastodon is injured with an ankle ligament sprain and is expected to be out for approximately 23 days. |
| 01-04-1981 | The Winnipeg Mastodon have placed Fred Rivera on the Injured Reserve list for the remainder of the season. |
| 01-04-1981 | Fred Rivera of the Winnipeg Mastodon is injured with a shoulder joint injury and is expected to be out for approximately 24 days. |
| 10-07-1979 | Fred Rivera of the Winnipeg Mastodon is injured with a hip contusion and is expected to be out for approximately 11 days. |
| 11-20-1977 | The Winnipeg Walrus have moved Fred Rivera and Toddrick Johnson to the active roster. The Winnipeg Walrus have moved Grady Robinson and Moses Mathis to the inactive roster. |
| 11-06-1977 | The Winnipeg Walrus have moved Grady Robinson to the active roster. The Winnipeg Walrus have moved Fred Rivera to the inactive roster. |
| 11-06-1977 | Fred Rivera of the Winnipeg Walrus is injured with a finger fracture and is expected to be out for approximately 14 days. |
| 11-29-1976 | The Winnipeg Walrus have moved Fred Rivera to the active roster. The Winnipeg Walrus have moved Grady Robinson to the inactive roster. |
| 11-07-1976 | The Winnipeg Walrus have moved Angelo Roberts to the active roster. The Winnipeg Walrus have moved Fred Rivera to the inactive roster. |
| 11-07-1976 | Fred Rivera of the Winnipeg Walrus is injured with a hip muscle strain and is expected to be out for approximately 15 days. |
| 09-08-1975 | The Winnipeg Walrus have moved Fred Rivera to the active roster. |
| 09-08-1975 | The Winnipeg Walrus have acquired Fred Rivera from the waiver wire. |
| 09-01-1975 | The Chicago Dawgs have waived Fred Rivera. |
Defensive Tackle