Rock Lake is the deepest and largest of all scabland lakes left behind from the Missoula Floods, and holds that distinction for all of eastern Washington. At its deepest, it is more than 360 feet deep, although the official measurement is uncertain. The lake is over 7 miles long and averages 1 mile in width, and is accessible via a solitary landing are…Rock Lake is the deepest and largest of all scabland lakes left behind from the Missoula Floods, and holds that distinction for all of eastern Washington. At its deepest, it is more than 360 feet deep, although the official measurement is uncertain. The lake is over 7 miles long and averages 1 mile in width, and is accessible via a solitary landing area located on the south end. The rest of the shoreline is inaccessible to vehicles, other than a few private properties.
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