The Lower Yellow Creek Restoration Project in the Blacklick Creek watershed, was launched in 1998 as a 5 phase plan to restore the last 3.5 miles of Yellow Creek in Indiana County.  At the time, that stream section was the only one in the entire 420 square mile Blacklick Creek Watershed meeting DEP recommended comprehensive sequential approaches to watershed restoration.  Phase 1A and 1B passive treatment systems were installed in 1998 and 1999 and were initially funded by  319NPS grants which were later supplemented by Western PA Watershed Protection funds.  Subsequent Phase 2 passive systems (2A, 2B and 2C) were initially funded by Growing Greener, 319 NPS and W. Pa. Watershed Protection Grants.  The first 4 systems were modified to sulfate reducing bio-reactors (SRB) in subsequent upgrades and Phase 2C was designed and built completely as a deep bed SRB in 2003. Operation, Maintenance, Replacement costs were generally funded by W. Pa. Watershed Protection and various corporate and foundation grants.  In general the AMD being treated exhibited pH values from 2.5 to 3.0, aluminum content around 25 mg/l and iron content from 30 to 100 mg/l.  Each system has displayed success for varying periods of time - generally producing effluent of pH 6.0 or above with significantly reduced metal loadings (Aluminum <0.10 mg/l, Iron < 1.0 mg/l).  Flow rates have varied from 30 gpm to over 250 gpm.