The McTavish reservoir, named for Simon McTavish, is an underground reservoir and park located within McGill University's campus on the southern slope of Mount Royal in Montreal, Quebec, Canada. It holds 37 million gallons of water and is supplied by its large Château Style pump-houses located in the south-eastern corner of the park. The site of the reservoir is also known as Rutherford Park and is the location of the McTavish automated weather reporting station (CWTA, 71612).