1.1 The Tioga River Watershed is located in Tioga and Bradford
Counties about 35 miles north of Williamsport, Pennsylvania.
1.2 It originates in Armenia Township, Bradford County
and travels southwest towards the town of Blossburg.
1.2.1 In Blossburg, the Tioga turns direction and flows
north through Mansfield and into the
Tioga/Hammond Dam Complex.
1.3 The Tioga River can be accessed by traveling on US Route 15
north from Williamsport, Pennsylvania or south from Corning,
1.4 The Tioga River flows through the Northcentral Bituminous
Coalfield in northcentral Pennsylvania.
1.5 Tributary of the Chemung River
2.1 The Tioga River Watershed is affected by pollution from AMD.
2.2 This pollution has caused high levels of metals and low pH
in the mainstem of Tioga River and in some of its
2.3 From historical records and field observations, it was determined that
the majority of AMD degradation in the watershed is due to abandoned
deep mines in the Morris Run, Fall Brook, Bear Creek, Coal Creek and
Johnson Creek subwatersheds
2.4 The bituminous coal region is characterized by strip and drift mining of coal seams that
are horizontal in orientation. This often resulted in fairly level underground tunnels
running for miles, as coal was mined along a particular seam. After the mine workings had
been abandoned, the tunnels often collapsed, filled up with water, and some now
discharge to the surface. Many of these discharges are very large and are responsible for
much of the water quality impairment in the region.
2.5 In the Tioga River Watershed, many of the tunnels were used to dewater the mines and to
allow airflow into the mines. They were dug in an upslope direction, allowing gravity to
dewater the mines. This type of drainage tunnel can be particularly difficult to treat
because they often drain large volumes of water from a large underground area.
3.1 Land Use (2006):
4.88% Developed: 0.28%
0.04% Water: 0.77%
3.2 Major population centers in the watershed include the towns of Blossburg
and Mansfield. Other smaller residential areas occur throughout the
3.3 Many of the dwellings found in the upper section of the watershed are used as
seasonal camps, with much of the land owned by absentee landowners, coal company
trusts or the Commonwealth of Pennsylvania.
3.4 It drains a region of ridges in the northern Allegheny Plateau in the watershed
of the Susquehanna River.
3.5 Population (2010): 401
4 DRAINAGE CHARACTERISTICS
4.1 Monitored Drainage Area: 13.5 square miles
4.2 Total Stream Length: 24 miles
4.2.1 24 miles are designated as Warm
4.3 4.2 miles impaired by Atmospheric
4.4 Average Annual Flow at Station (NHD): 18.8 cubic feet per second (cfs)
4.5 Maximum Flow Time from
Headwaters: 8 hrs. 33 min.
4.6 Natural Gas Drilling Pads (as tracked by SRBC): 5
4.7 Permitted Natural Gas Water Withdrawals: 0 Frac Water Withdrawals
4.8 Public Water Supply: 1