Glad to hear that the siphon did the trick. I don't know if the regular quickcrete will work, you might need to get the kind that is used for setting posts. It's designed so it could be poured dry into the hole and then water poured on top of it.

I'd be concerned about how tightly it bonds to the riprap.

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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).