Loutre Slough
Loutre Slough is a stream in southeastern Montgomery and southwestern Warren counties in the U.S. state of Missouri. It is a tributary of the Missouri River.
The waterway lies within the Missouri River Valley. The source is northwest of Hermann at. The waterway is interrupted by the dikes along the Loutre River south of McKittrick. The stream crosses under Missouri Route 19 south of McKittrick and runs semi-parallel to Missouri Route 94 past the community of Case where it is joined by the waters of Massie Creek. The stream flows on to the east-southeast to its confluence with the Missouri River just south of the community of Gore at.
Loutre is a name derived from the French meaning "otter".
