Message posted by OldThudMan~!!~ on March 28, 2016 at 6:28:33 PST:
If they were next to and/or along canal/the L.A. river etc they are probably water depth gauges transmitterss......We have similar here in Houston that measure depth of the bayous, creeks........very important during flood events....
In Reply to: OT: Mystery or not? posted by WheresJanet on March 26, 2016 at 13:45:19 PST: