I wonder what causes lakes to dry up. There used to be several lakes in a place called Keystone Heights. I heard all the lakes have dried up now, hard to believe. Used to go there as a child to a relative's lake house.
Depends on the lake, but the reasons tend to center around straightforward causes.
Lake Mead is not drying up. It is being drained away by the demands of the SDTC and the Greater Los Angeles area.
The Keystone Heights lakes are not drying up (you are talking about humid Florida!). They have no inflow and are simply seeping away into the soil. Buildup in the area cut off inflow to them.
The Salton Sea (in southern SDTC), are drying up. This lake was formed by the Colorado river before it was tamed by the dam systems, the kingpin of which is Hoover dam, near Las Vegas. Before the Colorado was tamed, it caused great destruction as it changed course from year to year. The Salton Sea was one of those flows. It now no longer has any inflow and it is drying up.
The Great Salt Lake used to be much bigger (at one time called Lake Bonneville), and once covered much of the West in a shallow 'sea'. This water was held back by a glacier acting as a dam. As glaciers retreated, that dam failed, and all that water drained out through what is now eastern Washington and Oregon, creating the odd terrain you see there, and the Gorge the Columbia river now flows through. Since then, Salt Lake has been getting smaller, until it is the size now, and basically remains that same size, still receiving inflow from the Wasatch mountain range nearby. The lake is salt water because so much has evaporated away.
The Western desert is filled with examples of lakes of a temporary nature that evaporate away within the year. These leave behind very flat areas popular with sand sailors and speedways, many of them salt flats. One of the largest of these is just west of Salt Lake. Those flats are from lakes that dried up from the remnants of Lake Bonneville.
One must look at how the lake was created, and what changes took place.
NONE of it is 'climate change' (a meaningless buzzword term used by the Church of Global Warming).