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Source: https://erdc-library.erdc.dren.mil/jspui/ ; The John H. Overton Lock and Dam will be the second navigation structure proposed for the development of navigation on the Red River waterways. The structure will be located in a cutoff channel in the left overbank about 74 realigned channel miles above the Mississippi River. The structure will include one lock located along the left bank with clear chamber dimensions of 84 by 785 ft and a dam consisting of a spillway with seven 50-ft-wide gates and a 330-ft-long fixed-crest overflow weir designed to maintain during low flows a minimum upper pool at el 58.0 extending upstream about 37.5 miles to the proposed Lock and Dam 3. A semifixed-bed model reproducing about 3.7 miles of the Red River channel and adjacent overbank areas to an undistorted scale of 1:100 was used to provide some general information on navigation conditions with the proposed design and to develop such modifications as might be required to eliminate conditions that would adversely affect navigation using the lock. Results of the investigation revealed the following : (A.) Satisfactory navigation conditions in the upper lock approach could be developed with modification of the excavation along the left bank of the approach channel and extending the length of the upper guard wall. (B.) The length of the overflow weir and excavation along the right bank of the cutoff channel could be reduced without affecting navigation conditions in the lock approaches or flow through the dam. (C.) Satisfactory navigation conditions could be developed in the lower lock approach with either a floating guide wall (land side) or a guard wall (river side). Conditions for two-way traffic would be better with the guide wall. (D.) The differences in the water-surface elevations across the dam with plans tested would tend to be small.