Cass Lake is on the main branch of the Clinton River.Upstream from Cass Lake is 243-acre Loon Lake. Cass Lake also connects with 363-acre Elizabeth Lake.Downstream from Cass Lake is the 532-acre Sylvan Lake.Cass Lake is the largest and deepest lake in Oakland County, and is in the northern Metro Detroit region of southeastern Michigan.Largest and deepest Oakland County lakesThe ten largest lakes in Oakland County are:1. Cass Lake (Waterford Twp.) 1,280 acres2. Kent Lake (Milford Twp.) 1,200 acres3. Orchard Lake (West Bloomfield Twp.) 795 acres4. Walled Lake (Commerce Twp.) 670 acres5. Pontiac Lake (Waterford Twp) 640 acres6. White Lake (White Lake Twp.) 540 acres7. Sylvan Lake (Waterford Twp.) 532 acres8. Lake Orion (Orion Twp.) 506 acres9. Lake Angelus (Auburn Hills) 477 acres10. Union Lake (Commerce Twp.) 465 acres
