What is "clarkson valley"

Population (2000): 2675
Housing Units (2000): 898
Land area (2000): 2.688071 sq. miles (6.962072 sq. km)
Water area (2000): 0.052279 sq. miles (0.135403 sq. km)
Total area (2000): 2.740350 sq. miles (7.097475 sq. km)
FIPS code: 14176
Located within: Missouri (MO), FIPS 29
Location: 38.617353 N, 90.588218 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: