Watershed Profile: Grays Run near Gray, PA

Watershed Overview
Grays Run begins in northern Lycoming County, PA and flows south through Loyalsock State Forest until its confluence with Lycoming Creek near the town of Gray, PA. The monitoring station is located north of Gray, PA near the Dry Run Road bridge crossing.
Drainage Characteristics
  • Drainage Area (square miles): 19.67
  • Total Stream Length (miles): 29.3
  • Average Annual Flow at Station (NHD) (cfs): 30.7
  • Population (2020): 219
Stream Classifications (Pennsylvania)
Designation Miles
High-Quality Cold Water Fisheries 29.28
Total 29.28
  • Land Use
  • Description Percentage
    Water 0.04
    Developed Open Space 1.59
    Low Urban 0.07
    Medium Urban 0.09
    High Urban 0.08
    Deciduous Forest 67.58
    Coniferous Forest 0.78
    Mixed Forest 23.58
    Shrub Scrub 4.92
    Grassland Herbaceous 0.84
    Pasture/Hay 0.14
    Wetlands 0.29
Underlying Geology
Rock Type Percentage
Sandstone 98.57
Shale 1.43
Recent Results
Sample Time 4/24/2024 6:00:00 AM
Temperature  (C) 9.11
Specific Conductivity  (mS/cm) 0.029
PH 7.1
Turbidity  (NTU+) 2.14
Dissolved Oxygen  (mg/L) 10.99
Dissolved Oxygen (last month of readings)
pH (last month of readings)
Specific Conductivity (last month of readings)
Temperature (last month of readings)
Turbidity (last month of readings)
Natural Gas
  • Natural Gas Pads 7
  • Natural Gas Water Withdrawals 0
Public Water Supply Withdrawals
  • Groundwater 0
  • Surface Water 0
NPDES Discharges
Description Count
Concentrated Animal Feeding Operation 0
Mining/Quarry 0
Stormwater 0
Wastewater Treatment Plant/Sewage Treatment Plant 0
Other 0
Stream Impairments
Source Category Miles
Atmospheric Deposition Aquatic Life 5.10