ECM Speedway (fka Arkadelphia Speedway, River Valley Speedway) Submit new listing Favourites Print listing Save as PDF Add bookmark ECM Speedway (fka Arkadelphia Speedway, River Valley Speedway) The RosterMotorsportsTracksECM Speedway (fka Arkadelphia Speedway, River Valley Speedway) AddressArkadelphia, AL 35033, Alabama, USACategoriesTracksContact InformationWebsitehttps://www.facebook.com/ECMSpeedway/Social MediaFacebookhttps://www.facebook.com/ECMSpeedway/