Webbers Falls Lake, also known as Webbers Falls Reservoir, is a reservoir created by a lock and dam on the Arkansas River in Muskogee County, Oklahoma. The normal elevation is 490 feet (150 m). It has 157 miles (253 km) of shoreline and a surface area of 11,600 acres (47,000,000 m2). The drainage area of the lake is 97,033 square miles (251,310 km2). It is an integral part (Lock and Dam No.