The Devil's Island Reach of the Mississippi River is located about 5 miles upstream of Cape Girardeau, Missouri, between miles 55.0 and 68.0. A movable-bed model with scale ratios of 1:400 horizontal and 1:100 vertical, reproducing approximately 13.0 miles of the Mississippi River, was used to develop a channel of project dimensions through the reach. Results of the investigation indicated that : Contracting the channel in this reach to a control width of 1500 ft should generally provide adequate channel depths and alignment, except that special treatments might be required in crossings depending on the channel alignment and degree of sinuosity provided in the improvement plan. The control width can be reduced to less than 1500 ft to improve the depth and alignment of the channel over crossings with dikes of lower elevation than those used for the 1500-ft contraction. The cost of dike construction can be reduced by use of the stepped-down principle in the design of dike systems. The plan developed during this study and recommended herein produced the best overall results insofar as navigation is concerned. Use of the stepped-down principle in the design of the dike system in this plan resulted in a lowering of the average elevation of the new dikes by about 5 ft, with some reduction in the total length of dikes required. The habitat of fish and wildlife can be enhanced by the use of properly designed longitudinal (L) sections on some of the spur dikes; however, use of L sections would increase the construction costs appreciably.
Channel Conditions, Devil's Island Reach, Mississippi River, Missouri and Illinois: Hydraulic Model Investigation
Technical Report ; H-73-1
1973
3814573
Report
Electronic Resource
English
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