Diamond Lake is a 1,020-acre all-sports lake just southeast of Cassopolis in Cass County, the largest lake in southwest Michigan.
We rent MasterCraft wakesurf boats, Sea-Doo jet skis and water toys on Diamond Lake, and everything is ready for you at the lake. Add a captained charter with lessons for every level.
It's up to 64 feet deep, and 43-acre Diamond Island sits in the middle of the lake, reached by a small seasonal ferry.
Boat, jet ski and water toy rentals at Diamond Lake
Just show up and ride — your boat, jet skis and gear are ready at Diamond Lake with no towing required.
- MasterCraft wakesurf & wakeboard boat rentals – premium surf boats seating 12 to 18, with surf boards, wakeboards, skis and tubes available.
- Jet ski rentals – late-model Sea-Doos for one to three riders, great for cruising Diamond Lake or pulling a tube.
- Boat tours & private charters – relax while an experienced driver-instructor handles the boat, with wakesurf, wakeboard and ski lessons for every level.
- Tubes, paddle boards and floats – extras that turn a boat day at Diamond Lake into a full beach party.
Book Now or call or text 1-888-594-6610 – we answer 7 a.m.–10 p.m. every day.
Diamond Lake at a glance
| Location | Cassopolis, Cass County |
|---|---|
| Size | About 1,020 acres |
| Max depth | About 64 feet |
| Island | Diamond Island |
| Nearby | South Bend, Chicago (2 hours) |
| Region | Southwest Michigan |
Best things to do on Diamond Lake
- Water skiing and tubing – open water on the main lake.
- Wakesurfing – calm water out in the middle of the lake.
- Jet skiing – open water more than 100 feet from shore, docks and swimmers.
- Island cruising – laps around Diamond Island.
Where to launch at Diamond Lake
- Public launch – the public launch off M-60, plus the marina on the lake.
Keep to slow, no-wake speed within 100 feet of shore, docks, rafts and swimmers, and watch for posted local no-wake hours. Your rental from us is ready at the lake.
Tips for a great day on Diamond Lake
- Mornings are calmest for surfing.
- Michigan requires an observer besides the driver when towing.
- Jet skis can't run between sunset and 8 a.m. in Michigan.
Michigan boating rules to know
- Every boat needs a wearable life jacket for each person on board. Children under 6 must wear one on the open deck whenever the boat is underway, and everyone on a jet ski or being towed must wear one.
- Towing a skier, wakeboarder or tuber requires an observer besides the driver, and the person being towed must wear a life jacket. Towing isn't allowed from one hour after sunset to one hour before sunrise.
- Jet skis can't be operated between sunset and 8 a.m., must stay at slow-no-wake speed within 200 feet of a Great Lakes shoreline, and the engine cut-off lanyard must be attached to the driver.
- Stay at slow-no-wake speed within 100 feet of docks, rafts, swimming areas, moored boats and people in the water, and in shallow water near shore. Many inland lakes also have local slow-no-wake hours, so follow the posted rules at the launch.
Map of Diamond Lake
Diamond Lake rental & boating FAQ
What can I rent at Diamond Lake?
MasterCraft wakesurf and wakeboard boats, Sea-Doo jet skis, water toys like tubes and lily pads, and private boat tours with lessons.
Do I need a truck to tow the boat?
No. Your boat or jet skis are ready for you at Diamond Lake, so there's no towing.
Where is Diamond Lake?
Just southeast of Cassopolis in Cass County, southwest Michigan, about 2 hours from Chicago.
Can you jet ski on Diamond Lake?
Yes. Jet skiing, waterskiing, wakeboarding and wakesurfing are all popular on Diamond Lake.
How big is Diamond Lake?
About 1,020 acres, the largest lake in southwest Michigan.
Is there an island on Diamond Lake?
Yes. Diamond Island, about 43 acres, sits in the middle of the lake.