The park, named after explorer Major Andrew Henry, opens the Thursday before Memorial Day and closes October 31, or as weather conditions warrant. After September 15 it is wise to call ahead to see which services are available. Excellent stream fishing can also be found in the nearby Henry's Fork, Madison and Gallatin rivers. Boating A boat ramp and docks are available in the park. Boaters should be cautious of the lake's unpredictable weather.
Winds can make the surface choppy.
Camping The park offers 45 campsites of which 26 sites have water and electricity and the remaining sites have central water. All sites have a picnic table and campfire grill. There is a central utility building with restrooms and showers.