Navigation Conditions at Gallipolis Locks and Dam, Ohio River. Hydraulic Model Investigation

摘要

Gallipolis Locks and Dam, located approximately 279.2 miles below Pittsburgh, is one of the original 46 locks and dams provided for navigation. Capacity of the existing locks and their approaches are inadequate for present and projected traffic. Alternatives considered for the improvement of conditions included construction of either one 1,200-ft lock, one 600-ft lock, or two 1,200-ft locks in a canal bypassing the existing structure, with and without use of the existing locks with some improvements; and a complete replacement structure with two 1,200-ft locks about 3 miles downstream. Two fixed-bed models constructed to scales of 1:120 were used to study navigation conditions at the existing site would continue to be difficult and hazardous for downbound tows using the existing locks although improvements could be made. Satisfactory navigation conditions could be developed with one or two locks in the bypass canal at the existing site, and provisions could be made for two-way traffic under most conditions with two locks in the bypass canal. Navigation conditions for downbound tows approaching the locks with the plan alternate site replacement structure would tend to be difficult and hazardous with the plan as originally proposed. A satisfactory plan was developed by shifting the structures downstream, rearranging the lock auxiliary walls, and modifying the excavation of the adjacent (right) bank. (edc)