It is not uncommon for the river to be reduced to a trickle during dry summer spells, and rise to a whitewater torrent after a few days of rain.

The upper section of the river (above Banning State Park) is generally quick moving with frequent riffles and a few class I rapids.

The steep rocky sides to the river, and undercut banks and kettles, can make a rescue very difficult in these conditions.

From the falls to the confluence of the St. Croix, the Kettle continues to drop at a moderate rate with frequent riffles and occasional class I rapids.

This last section of the river is some of the best canoeing available in the state with manageable rapids, good fishing, frequent wildlife sightings (including bears) and absence of other people.

The Kettle River hosts class III-IV white water rapids that are frequently paddled by kayakers, canoeist, and rafters.

Artists Clara Mairs and Clement Haupers frequented the Kettle River, and created paintings of the people and landscape.