Anybody ever get anywhere with a DIY pond dredging operation?

I've got a 30,000 sq ft pond with 3' of muck on the bottom. Willing to spend some time and money to clean it out but unsure of what type/size of dredge I'm supposed to be shopping for.

I've got 3 lakeside lots I can dump the muck onto as I need to build them up anyway.

Thanks