Just checked today. 14.5", the thickest I've seen on my pond. Cecil, I didn't try to set a speed record, but I'll bet it took less than a minute for me to get the hole cut with the Lazer hand auger.

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[Linked Image from lh6.ggpht.com]
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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).