His efforts led the Falcons to an 11–2 record and a runner-up finish in the CIF-North Coast Section Open Division in 2016.

[1] Accepting a scholarship to Fresno State, Rivers played in all but one of the team's 14 games, including seven starts.

Against Wyoming, Rivers scored the first receiving touchdown of his college career on 21-yard reception in the second quarter, which proved to be the Bulldogs' only TD in a 13–7 victory that clinched a berth in the Mountain West Conference championship game.

In his sophomore season, Rivers appeared in 11 games and made six starts and totaled 1,192 all-purpose yards and scored a team-high 13 touchdowns.

Against New Mexico, Rivers scored a career-high three TDs (two rushing, one receiving) in Fresno State's 38–7 win.

Rivers was named MVP of the Las Vegas Bowl after setting single-game career highs in rushing attempts (24) and yards (212) while also having a 41-yard punt return as the Bulldogs defeated Arizona State 31–20.

Granted an extra year of eligibility following the pandemic, Rivers returned for a fifth season and was a Bulldogs team captain for 2021.

[7] He carried the ball two times for six yards in the Seahawks' final preseason game, a 27–26 loss to Dallas, and was waived on August 28.