Keyhole reservoir is behind a dam on the Belle Fourche River. It's primary purposes are flood control and cropland irrigation. Consequently it's water level fluctuates throughout the year. It's usually at it's peak in late spring but the lake can be sailed as long as it's not covered by ice.
I enjoy boating (sailing and kayaking) at Keyhole because it's close to my home, there's usually plenty of wind blowing and it's scenic. Here are some pictures from trips I've taken there since I moved to Gillette in '98.
Quiet Cove
Almost no wind, but the boat is
still moving
Elaine and Nick Jessen - Chef Nick
Prepared Lunch
Limestone Cliffs
Sheila, Hanna, Elen and Kelly Bush