丘谷湖是英格兰的水库，由森麻实郡负责管辖，面积4.9平方公里，集水区面积57平方公里，是该国第五大人工湖泊，平均水深4.3米，最大水深11米，蓄水量0.02立方公里。

Chew Valley Lake (grid referenceST5659) is a large reservoir in the Chew Valley, Somerset, England, and the fifth-largest artificial lake in the United Kingdom (the largest in south-west England), with an area of 1,200 acres (4.9 km²). The lake, created in the early 1950s and opened by Queen Elizabeth II in 1956, provides much of the drinking water for the city of Bristol and surrounding area, taking its supply from the Mendip Hills. Some of the water from the lake is used to maintain the flow in the River Chew.