Natural swimming hole
John Martin Reservoir
Lake · Colorado
Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
A large Arkansas River reservoir on the southeastern plains with shoreline swimming and boating. John Martin is a big-sky prairie lake with a state-park feel. The water warms nicely in summer.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 70s-80s summer |
| Depth | swim near shore |
| Best season | June-September |
| Fees | Free |
| Reservations required | No |
| Hours | sunrise-sunset |
| Parking | Day-use lots |
| Amenities | restrooms, picnic tables |
| County | Bent County |
| Nearest town | Las Animas |
| Safety notes | No lifeguard |
Map
Nearby swimming holes
Frequently asked questions
Can you swim in John Martin Reservoir?
Yes — John Martin Reservoir is listed as a natural swimming spot in Colorado. Reported water temperature: 70s-80s summer. Heads-up: No lifeguard. There are rarely lifeguards at natural swimming holes — verify conditions locally before you go.
Does John Martin Reservoir require reservations?
No reservations are required at John Martin Reservoir based on current information — but verify before you go.
Is there a fee to visit John Martin Reservoir?
Reported fee info: Free. Fees can change — confirm with the official link.
When is the best time to visit John Martin Reservoir?
The best season is typically June-September.