website: betrivers.com
BetRivers Sportsbook is a fairly new US sportsbook. Their parent company, Rush Street Interactive, launched in 2012.
BetRivers Sportsbook is offered by the Rivers Casino. Rush Street operates five physical casinos under the Rivers name in downtown Pittsburgh and Philadelphia, Portsmouth, the Capital Region of New York, and in the Chicago suburbs.
Not much information is available about them online.