I'll bet Bob Lusk knows what a ballpark price for there would be.

I recently met with a dirt guy and a customer that wants to build a pond. The dirt guy said here in Northern Indiana he was looking at anywhere from $25K-$35K per surface acre for a 100% excavated pond, no dam, all dirt spoils disposed on site with good clay found on site. It all depended on depth of the pond, if pumps needed to be brought in to keep the hole dry while it was dug, and what other treasures they came across under ground that they had to deal with.

This dirt guy has all the equipment needed, and has 8 guys working for him.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).