"Our" lake (lake Gairdner) has had varying conditions in the time I have been there, from 2004, 'till 2015, I have seen it flat & dry, scattered with the usual octagonal pressure ridges, , no ridges, and weird crystaline "growths".
While trying to erect shade structures, track markers & the like the salt has been soft (damp), hard , hard for 1/2", than soft (once the crust was gone thru), and as hard as rocks well below the depth of the pegs/nails/ tec screws being driven into it.
We have had silt washed onto the lake during heavy rains from the surrounding hills, which seems to migrate thru the salt over time, as the wet / dry cycles take place.
We have had a hard salt crust deposited over this silt some years, some years there is very little "loose" crystals sitting on to of the crust, but I have seen years where there is very little ?
The "road" to the pits (usually 3 miles from the lake access point, on the salt) can become compacted by traffic to & from the pit area, and can be seen from satellite images, other years, there is minimum change in this area and compaction is not a factor ?
Many have commented that 2015 salt conditions were "the best they have seen", but I have seen much better in previous years than this one.
If only we understood why ?
Tiny