Claim: Oxford Slough Waterfowl Production Area, established on 1985, has an area of 7.60 square kilometers.
Evidence: 1985 1,878 acres (2.934 sq mi; 7.60 km) 
It was purchased in 1985 from the Federal Land Bank using Federal Duck Stamp funds to protect redhead nesting habitat. 1,878 acres (2.934 sq mi; 7.60 km)