How many of you have created strategic water holes for wildlife? I've been reading Jeff Sturgis' book and find it pretty interesting that he uses 110 gallon stock tanks for his water holes. My only concern is EHD and other potential diseases associated with water sources. Do these water holes do more harm than good?

If you've created your own water holes, post some pics!
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"For I know the plans I have for you..." Jer. 29:11