I think a good pond builder wouldn't have a problem digging the middle of the pond down to get your depth. I would really work on getting some underwater structure built in...elevation changes of two feet (ridges), channels, etc. Sketch those out ahead of time.
Because the creek forms above your property it would be really good to have a small catchment pond above yours. May not be possible due to the 300' rule, but maybe you can come back in later and build some small ponds yourself. Catmandoo in WVa has done a number of these (I think he is the one) and discussed them on the forum.
