| Rock Lake | |
| Location: | Manitoba, Canada |
| Coordinates: | 49.1692°N -99.2469°W |
| Type: | artificial lake |
| Pushpin Map: | Manitoba#Canada |
| Pushpin Map Caption: | Location of the lake in Manitoba |
Rock Lake is the second largest navigable lake in southwestern Manitoba, Canada. It is about long and wide with a surface area of 6.6mi2. Rock Lake is relatively shallow with a mean depth of and a maximum of when the lake is at a surface water level of .[1] The summer target for the lake is . The lake is fed by several waterways the main ones being the Pembina River and Badger Creek. The total drainage area is 3842km2.
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 south of Glenora and west of Pilot Mound, Manitoba. The lake is in the Rural Municipalities of Roblin, and Argyle.
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.