National Program of Inspection of Non-Federal Dams, Tennessee. McNairy Cypress Creek Watershed Dam Number 17 (Inventory Number TN 10908), Tuscumbia River Basin, near Selmer, McNairy County, Tennessee. Phase I Investigation Report

摘要

McNairy Cypress Creek Dam Number 17 is located in McNairy County, Tennessee, about 0.5 miles east of Selmer. The dam is an earthfill embankment 34.1 feet high and 960 feet long with a crest width of 15 feet. The dam impounds a 13 acre lake. McNairy Cypress Creek Dam Number 17 is in the small size category and has a downstream hazard potential classification of 'high' under OCE guidelines and category 1 by the State of Tennessee. On the basis of hydraulic analysis, the dam has adequate storage/spillway capacity to pass the 1/2 probable maximum flood (PMF) under antecedent moisture condition III (AMC III). The 1/2 PMF is the minimum storm required under OCE guidelines for a dam in the small size and high hazard potential classifications. At this time, the dam is considered not deficient. It is recommended that any erosion be repaired and a soil binding grass cover established on the embankment.