The subject actually raises alot of questions... for instance one of the lakes close to me is a "County lake" It splits 3 counties, It was Built and is maintained By the corp of engineers. 4 free "county parks and several private ones. (who they lease from,, or own the property i dont know), no corp lakes, No state parks, There is private property butted up to that lake . I can dig anywhere except the private parks, or private property Ive been turned down at.
This lake is a Corp of engineers lake, NO private property butted up to its shores.. 2 state parks (absolutely no digging there, even though their shores are corp property and maintained by the corp..

.., 3 private parks (can dig there)leased from the corp. 2 corp parks... All very odd and contradictory to me.
It seems to me if its a corp lake its free game up to the High water mark, in any park,,,,, Of course Im not going to debate some Gate keeper or State park ranger or some Drunk marina owner,,,,,, But there it is. Im just grateful to have a place to dig.
All that said,, My friend was recently asked to stop metal detecting at lake lewisville in Texas, (notice Im not naming MY spots LOL)
But we found out... Its allowed,,, they issue free permits there, just so you understand the rules.He of course was told it isn't allowed, period...
I'm told in Travis county... Lake Travis, (home of hippy hollow, and a very Rich folks lake,) It is NOT allowed Period. I don't know I don't go there its to far...
Its best to just ask.