What is "portage des sioux"

Population (2000): 351
Housing Units (2000): 152
Land area (2000): 0.470928 sq. miles (1.219698 sq. km)
Water area (2000): 0.035090 sq. miles (0.090882 sq. km)
Total area (2000): 0.506018 sq. miles (1.310580 sq. km)
FIPS code: 59150
Located within: Missouri (MO), FIPS 29
Location: 38.926348 N, 90.342982 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: