The Milk Run Abandoned Mine Drainage System project is a broad-based, public-private partnership effort that includes the Montour Run Watershed Association, Continental Communities II LLC (landowner), Range Resources, PA DEP, Allegheny County Conservation District, Washington County Conservation District (WCCD), Independence Conservancy, BioMost, Inc., and Stream Restoration Incorporated (non-profit).

MKR3 abandoned underground mine discharge at headwaters of Milk Run



The Milk Run abandoned mine discharge emanates from a drainpipe in an abandoned underground mine in the Pittsburgh coalbed. The drainpipe outlet is along Mahoney Road in North Fayette Township, Allegheny County. The acidic, metal-laden, discharge is the primary source of water in the headwaters of Milk Run. As the mine drainage is carried downstream, water of better quality is encountered, causing a limited increase in pH sufficient to initiate the precipitation of aluminum solids. The dramatically white-colored “Milk Run” flows about ¾ of a mile before the confluence with an unnamed tributary of good water quality which further aids in the precipitation of white aluminum solids. The aluminum solids at the site responsible for severely limiting aquatic life within Milk Run. The white plume of aluminum precipitates has also been observed in Montour Run.




Due to a reclamation in-lieu of agreement between Range Resources and the PA DEP, we were given a rare opportunity to treat the Milk Run discharge utilizing primarily private funding. Through the agreement, Range Resources will be providing $758,089 for design and construction as well as $191,000 for a long-term operation & maintenance fund. Additional required funding was sought through the US Office of Surface Mining’s Watershed Cooperative Agreement Program. The project is currently in the construction phase with expected completion in 2018.

Milk Run downstream of MKR3 (05/21/09)