A U.S. Geological Survey hydrologic technician uses a surveyor's level to check the stage (water level) of the Cannonball River at Breien, North Dakota.

Real-time streamflow and stage data for the Cannonball River at Breien may be viewed on the National Water Information System (NWIS).

Lewis and Clark also made scientific observations related to the Cannonball River. Visit the Lewis and Clark and the U.S. Geological Survey in North Dakota web site to learn more about how the Cannonball River has been described by Lewis and Clark and the U.S. Geological Survey.