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Aberdeen Lock and Dam will be the fourth structure proposed for the development of navigation on the Tennessee-Tombigbee Waterway. The lock and dam will be located in a bypass canal about 407.98 miles above the mouth of the Mobile River, or about 1 mile east of Aberdeen in Monroe County, Mississippi. The structures are designed to maintain a minimum upper pool during low flows extending 18 miles up the Tombigbee River and about 1.5 miles up Town Creek and into the Canal Section. The structures will include one lock with clear chamber dimensions of 110 by 600 ft and a dam with a 6-gated spillway section located in a bypass canal on the left overbank. A fixed-bed model reproduced about 1.0 mile of the Tombigbee River channel, the lock approach canal, and the adjacent overbank areas to an undistorted scale of 1:120.
The Columbus Lock and Dam will be the third navigation structure proposed as part of the development of the Tennessee-Tombigbee Waterway for navigation. The structure will be located in a bypass canal about 370 miles above the mouth of the Mobile River at the foot of Government Street in Mobile, Alabama, or just downstream from the confluence of the Tombigbee and Tibbee Rivers and about 4 miles northwest of Columbus in Lowndes County, Mississippi. The structure is designed to maintain a minimum upper pool during low flows extending upstream to the proposed Aberdeen Lock and Dam at mile 408 and will include one lock with clear chamber dimensions of 110 by 600 ft, a five-gate spillway section of the dam located in the bypass canal on the left overbank, and a fixed overflow section along the left overbank to high ground.
Jackson lock and dam will replace three out-of-date, small, low-lift locks and dams on the Tombigbee River. The lock is to be of the high-lift type with chamber dimensions of 110 by 600 ft, and will be located in the right bank about 600 ft landward of the river's edge. Model tests were conducted on a 1:120-scale model that reproduced approximately 2.3 miles of the river and the lock and dam structure. The model investigation was concerned principally with navigation conditions in the upper and lower lock approaches and over the fixed-crest spillway under various flow conditions, and determination of the best dredging plan, lock wall arrangements, and methods of overcoming any undesirable conditions. Another purpose of the model was to permit navigation interests to observe the structure in operation and satisfy themselves of its acceptability from a navigation standpoint. (Author Modified Abstract).