 Hennepin is one of 17 Minnesota counties with more savanna soils than either prairie or forest soils, and is one of only two Minnesota counties with more than 75% of its area in savanna soils (the other is Wright County).The highest waterfall on the Mississippi River, the Saint Anthony Falls (discovered by Louis Hennepin) is in Hennepin County next to downtown Minneapolis, but in the 19th century, the falls were converted to a series of dams.Barges and boats now pass through locks to move between the parts of the river above and below the dams.