Recently, the DNR drained a shallow lake about 20 miles from me. I think it is around 80 acres, built in the 30's during the depression. It does have a small beach area that I can hit in spring. Is there any point in MD the bottom area before they dig and refill?
Mojosworking
Hit every spot you can.
Dig every Signal You can !
My best spot ever was a Drained lake that was used for Swimming & fishing from approximately the 20's.
the rewards were plentiful.
Expect Gold, diamond & Silver Rings etc.
Silver Coins.
Religious medals from 40's war years especially. seemed everyone swam with one

the wealthy wore sterling medals .
Military items.
If any military Personnel swam there on their vacations
Diving goggles. & Flippers.
Oars.
Fishing Paraphernalia including whole rods, lead sinkers and flies.
Bottles.
Brass bullet casings & maybe Live Rounds.
(some people discarded boxes of Live rounds in lakes feeling it was a safe dump)
If there are steep banks people can fish off,
Expect complete tackle Boxes from the 30's up that slid into the water.
or out of Flipped canoes .
(if a Canoe flips, Naturally the rider is More interested in Survival Then retrieval)
if there is a road going by, Expect litter.
(some from people being chased or Paranoid)
including guns, Pay phones & parking meters & other formerly stolen items.
if there are extra deep pits.
don't rule out Federal Litter
(caches) also. like confiscated slot machines.
(tell tale signs of a Police Dump, large rock on a bank,
that looks out of place leading into the water. After dumping the cache,
they may have dumped a few loads of Rock to Hamper recovery like they did here)
Seriously it's only limited by the places popularity.
expect Boat anchors. Real store bought & home Made by pouring cement in large Coffee and meat cans from the 50's and 60's
and adding a Hook, window weights etc. anything metal & heavy

Don't rule out Aluminum Boats or cars under the Mud.
if still muddy Expect Cone Top Beer cans in good enough shape to take home
and sell or display. the thicker & Fresher the Mud the less oxygen.
once it dries & cracks the air gets in & the rusting starts.
I only wish I had a camera & on TreasureNet when
this one was being drained
http://www.sweetarrowlakepark.com/History.html