Theatre and venue just off Watford Lower High Street. The Colne River Room hosts an open mic night on Tuesday, jazz on Thursday and folk on Friday, which are the only nights when the bar is regularly open. The ales come from a wide variety of small breweries. There is a charge to listen to (or take part in) the music, but you can drink in the bar for free. The buildings used to house the pumping station supplying water to the Watford area - hence the name.