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Rock Lake (Manitoba) is the second largest lake in south western Manitoba, Canada. It is about 8 miles long and 0.75 miles wide with a surface area of 6.6 square miles (17.2 square kilometres). Rock Lake is relatively shallow with a mean depth of 2.5 metres and a maximum of 3.5 metres when the lake is at a surface water level of 405.08 metres. The summer target for the lake is 405.08 metres. The lake is fed by several waterways the main ones being the Pembina River and Badger Creek. The total drainage area is 4680 square kilometres (1800 square miles)

The lake has been a popular recreational area since the turn of the 20th century. The lake area is popular for boating, fishing, a wide variety of water activities, cottagers and home owners. It is located approximately 4.4 km south of Glenora and 15.7 km west of Pilot Mound.. Pilot Mound is about a 2 hour drive soutwest of Winnipeg. The lake is located in the Rural Municipalities of Roblin, and Argyle.

Rock Lake Dam
A concrete stop log dam was built about a mile east of the lake on the Pembina River in 1940. The dam is used to maintain levels a much as possible above 405.08 metres.