Fishing just off the reefs in 24 FOW we punched two tickets before noon running jointed DDHJ 6-1/2" in green and purple no weights 55-65 back on walleye inline boards, that would equate to 13-16 feet down depending on speed etc. We were running around 1.5 to 1.8 according to the GPS. Remember walleyes tend to feed up so trolling slightly above your marks usually works better.

As suggested by others get a Precision Trolling guide for accurate reliable information. Dive charts for almost all baits are in the book including plain lead weights.