Theatre and venue just off Watford Lower High Street. The Colne River Room hosts an “Open Mic” night on Tuesday & a ”Jazz Club” on Thursday, which are the only nights when the bar is regularly open. The ales come from a wide variety of small breweries, though the primary brewery is Tring. There is a charge to listen to (or take part in) the music, which entitles visitors to drink at the bar. Entry is always at the discretion of the event organiser. The buildings used to house the pumping station supplying water to the Watford area - hence the name