You might want to consider stocking some FHM or some other small fish that will eat the mosquito larva that will infest those ponds. Something cheap, because it'll have to be added every year. I don't know if Vector Control is still furnishing free Gambusia or not.

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).