If you want the pond to be as large as planned, you gotta keep digging. Chiseling out the rock if necessary. There's an article in one of the Pond Boss Magazines in the past year or 2 of exactly that scenario and what they did to keep digging the pond.

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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).