History may be posing a greater threat to the integrity of Folsom Dam than the terrorists. Recent road widening projects and dam improvements have uncovered several gold mining tunnels and shafts precariously close to the dykes which could comprise Folsom Dam. In attempt to safely probe the depths of a mine shaft between dykes 4 and 5, the Bureau of Reclamation pumped several thousand gallons into a large pit on top of the ridge this past August, 2013.
