About BetRivers Sportsbookīorn out of the Rivers Casino in Pittsburgh, Pennsylvania, the BetRivers online sportsbook and the betting app have now made it across state lines and are blazing their own path in the legalized sports betting world. Overall, BetRivers is a solid choice for new bettors who are looking for a user-friendly and reliable online sportsbook with a good selection of sports to bet on, an excellent player rewards program, daily bet & get promotions, and free bet bonuses.