Williams, who has flown over the area he describes, says the silt barrier, originally enforced in average by 500,000 tons of silt a day in 1930, has been reduced by the dams on the Colorado River to a bare trace of silt passing Yuma.
Thus the status quo of the silt barrier no longer exists, and twice each day the incoming tidal wave strikes the barrier below the border and bites off vast quantities of soil, retiring with it into the precipitous depths of the Gulf of California.
By 1940, the head of the gulf was found to have moved 18 miles northward of its location at the time Hoover Dam was completed.
>> 40 years ago A train robber clambered aboard a freight train Thursday either in Yuma or Winterhaven, broke into a U.S. mail “piggyback” truck, forced it open and threw between 200 and 300 mailbags onto the Southern Pacific right of way.
