My grandmother (on my mother's side) was a Schmehl. She was Alice Trout Schmehl, married to Dr. Wilson Rothermel of Reading. She could trace her Schmehl heritage to the 1740s when ancesters came to Berks County from Germany. I have a picture of the original cabin of our ancesters.
There was indeed a Schmehl Family Association located in Berks County. I recall attending a number of annual Schmehl family reunions on a property owned by the association. It was several acres located along Pricetown Road near Blandon, in Berks County, PA. I have a program of one of the early reunions. My mother was an officer in the association until the 1960s when it seemed to have disappeared. When I left home in 1964, my mother was remarking about how difficult it was to get the other officers together for meetings or to plan any future reunions.
After that time, I have no information about the association. It was obviously active during the first half of the 20th century. I suppose it would be possible to locate real estate and tax records from the 1960s to determine the disposition of the land owned by the association since I think the land may have been taken for highway construction or expansion.
I will search my files for any additional information.
Best wishes in your search,