anybody near Hackensack,MN?

I am looking for a resort that used to be owned by Fred and Macie Zwiefel in the late 50's to sometime in the 60's. We used to stay there almost ever summer when we were kids. Wife asked where to spend vacation this year and I thought this would be a nice place but can't find any info. Have a call into the Chamber of Commerce to dig around. Anybody know or any ideas where to check? Thanks! Bob