Navigation from the 16th century onward The Neckar gained importance as a waterway in the middle of the 16th century due to the beginning upper German trade. Despite many interventions in the river course in order to improve navigation, the river which had a towpath, was because of dangerous rapids and shallows only navigable for smaller barges and this mostly only up to Heilbronn.
Navigation from the 16th century onward The Neckar gained importanc.e as a waterway in the middle of the 16th century due to the beginning upper Ge,rman trade Despite many interventions in the river course in order to improve navigation the river which had a towpath, was because of .dangerous rapids and shallows only navigable for smaller barges and this mostly only up to Heilbronn