rec.ponds on usenet is an excellent newsgroup, in your particular area, try www.pagardenclubs.org
, mabe you can hook up with some people in your area.
I belong to the local garden club, I start the master gardening program this spring, so look into local orgs as well, maybe call your chamber.
Might also check with any extension services of the local universities and try 4H as well.
Iowa would be nothing without fertile soil and people who work it, so there aren't many communities who don't have some kind of gardening club.