rhine island namedyer werth, small blue bridge

infrastructure mittelrheintal deterioration westerwald leutesdorf connection freshwater andernach reservoir transport namedyer waterway building crossing rheintal riverbed koblenz germany neuwied remagen walkway channel flowing island bridge valley namedy stream rivers moving supply rhine werth small hills shore river brohl water coast canal track rhein gorge blue bonn east west area linz pier lake dock wall flow