On this day in Lewis & Clark history...
The reunited Expedition sets out early. With a favorable tail wind and the Missouri River current to their back, they paddle 86 miles. They see abandoned Mandan or Hidatsa villages and camp northeast of present Riverdale, North Dakota.
From the journals...
Friday 13th August 1806
all hands were on board and we Set out at Sunrize and proceeded on very well with a Stiff breeze astern the greater part of the day.
Bear Den Creek
Photo by A. Mast in Hydrologic Benchmark Network Stations in the West-Central U.S. 1963-95 (USGS Circular 1173).