thanks mike and prepakt...problem solved this afternoon...going to cut in a four barrel 18"-24" DIP with gates to open and control water level behind the dam...once we have this gravity bypass cut in, then we can dam off (rubble fill & fines) the breach and effect necessary repairs/grouting...
dam is 25' wide across the top...50' wide across at the toe...150' long...constructed with 4' boulders and rubble fill...then topped with concrete...several times because the first and each successive time they did a crappy job without much thought to what they were actually trying to do and the...
