The Rams elevated Rivers from the practice squad to the active roster Saturday.
Rivers was signed to the Rams' practice squad in late August after failing to make the 53-man roster at the end of training camp. Week 7 against the Jaguars marks Rivers' first elevation of the season, and he'll most likely see the field on special teams while serving as a backfield depth option behind Kyren Williams, Blake Corum and rookie fourth-rounder Jarquez Hunter.