I know the dirt is free, but is there inexpensive equipment available to use? That will take a LOT of dirt and a lot of diesel fuel! Figure that the pinnensula should be 3:1 slope or so (maybe less) for shallow habitat. That's a mound of dirt that would be roughly 100' wide at the base in the deepest part if the flat part on top was 10' wide.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).