Jones Bluff Lock and Dam is proposed for construction on the Alabama River about 245 miles above its junction with the Tombigbee River to form the Mobile River in south central Alabama about 45 miles above Mobile Bay. The project, which will provide a navigable pool for 75 miles upstream to the mouth of the Coosa River, comprises a nonnavigable gated dam with eleven 50-ft-wide by 35-ft-high tainter gates, an 84- by 600-ft lock on the left bank with a maximum lift of 45 ft, and a four-unit powerhouse on the right bank with a maximum discharge capacity of 35,200 cfs. A 1:100-scale, fixed-bed model reproducing approximately 3.6 miles of the Alabama River was used to determine navigation conditions in the lock approaches, determine effects of powerhouse releases, and develop modifications required to provide satisfactory navigation conditions. (Author).