United States, Arkansas, Desha, Desha County, Arkansas; Lock & Dam No. 2, Arkansas River, 4 mi E of Hwy 165.
33.77511 -91.070943 +-210m. WGS84
Lock no. 2 on the Arkansas River is in Arkansas County. Wilbur D. Mills Dam (used to be called Dam 2) is in Desha County so I am assuming this is the dam being referenced.