We hiked up to the top of Steamboat Rock, a quick but fairly steep climb. The top is nearly flat. It would have been the pre-flood height of the land surface. The large fragmented boulder in this picture is granite, as opposed to the bedrock here, which is all columnar basalts from the Columbia River Flood Basalt Group. Geologists call odd rocks like this erratics. It could have been brought here directly by a lobe of the Laurentide Ice Sheet (there is a moraine nearby) or it could have been carried here by the Missoula Floods inside an iceberg. The wildflowers happened to be in bloom while we were there, making the landscape pretty.