The Paint Branch Mills

My friend Kurt called me a couple of days ago to tell me of the ruins of an old mill he found along the creek near his home. I told him about a couple of markers that the Park Department put up along the creek. This is one of the markers:

The text on the marker says that Edmonton's Mill was built on the creek in 1763. Further upstream there is a similar marker for another mill, Snowden's Mill, which was built 40 years earlier. Neither marker was specific as to where exactly these mills were located, so I wondered if either could be the ruins Kurt found even though from his description those ruins were miles downstream.