It's common over the last 100k years for it to go dry and for the Colorado to overflow into it and to become a lake. Unfortunately, it's doubtful that the Colorado would ever overflow into it again unless someone makes a mistake.Remember that the lake was dry until some mismanagement of the Colorado river back in 1910 or something like that. The river ended up diverted into the dry lake bed for a couple of years giving us the lake we know today.