I am not a member but I am 99.99% certain Farmland Conservation Club has a bird dog training field. I have a friend that runs(whatever you say for bird dogs) Springers. I know the release birds there. I hope that helps.
If you have a local wildlife area, you might check with them. I took my Brits with chukars down to TriCounty by North Webster. They had an area or two designated for that purpose.
Also Conservation Bird Dog club in Amo, Indiana, also home of "NSTRA" the field trial organization, the club allows members to use the property for training, also has fishing lakes and of course field trials. I think the web link is "amocbdc.com" for membership info.