Grays Run begins in northern Lycoming County and flows south through Loyalsock State Forest until its confluence with Lycoming Creek near the town of Gray, Pennsylvania. The monitoring station along Grays Run is located north of Gray, Pennsylvania, near the Dry Run road bridge crossing.
Monitored Drainage Area: 16.2 square miles
Population (2010): 160
Total Stream Length: 24.6 miles
Stream miles impaired and dominant source/cause:
Average Annual Flow at Station (NHD): 30.4 cubic feet per second (cfs)
Maximum Flow Time from Headwaters: 10 hrs. 21 min.
Land Use (2006):
Natural Gas Drilling Pads (as tracked by SRBC): 9
Permitted Natural Gas Water Withdrawals: 0 Frac Water Withdrawals
Public Water Supply: 0 Groundwater Withdrawals and 0 Surface Water Withdrawals
Permitted Discharges and Type (NPDES sites):
Underlying Geology: Sandstone, Interbedded Sedimentary