Geography and Introduction:

The Upper Tioga River Watershed, which encompasses 280 square miles in northcentral Pennsylvania, is part of the Susquehanna River and Chesapeake Bay watersheds.

The Tioga River begins as a small stream on Armenia Mountain in Bradford County.  It flows southwesterly until it reaches the Blossburg area where it turns north, ultimately flowing into New York State where it joins the Cohocton River to form the Chemung River.  The Chemung River crosses back into Pennsylvania and joins the Susquehanna River near Sayre, PA.

As recent as the 1970’s, the Tioga River supported Class A wild brook trout populations.  Today the Tioga River from the confluence of the Fall Brook tributary can no longer support aquatic life.

Bituminous Coal Mining and the Watershed:

In 1792, coal was discovered in the Upper Tioga River Watershed near Blossburg.  Deep and strip mining for coal were major industries in the region through the 1980s, with mining operations ending in 1990.

When deep mining began in the watershed, entries into the mines were dug from below the groundwater table.  To keep the mines from filling with water, horizontal tunnels, known as drifts, were dug to allow water to drain by gravity out of the mines.  Water entering one mine could travel for many miles downhill collecting drainage from many other mine areas along the way before discharging in large volumes from a common opening.  Many coal seams are surrounded by pyrite-laden rock.  When pyrite is exposed to air and water in the deep mine, it reacts to form sulfuric acid that further dissolves metals in the surrounding rock.  The result is known as Acid Mine Drainage (AMD) pollution.  AMD has water quality characterized by low pH, high acidity, and high dissolved metals like iron and aluminum.

Pollution in the Watershed:

Pollution1The devastation of the river’s water quality is the direct result of AMD pollution.  Some of the more heavily polluted tributaries have pH levels similar to battery acid.

Acid rain is another source of pollution in the watershed. Acid rain has depleted the natural buffering capacity of the soils causing low pH, acidic water particularly during periods of high runoff.  Dissolved Colored Organic Carbons, produced by extensive natural wetlands in the watershed, also cause the stream water to take on a brown/orange hue.Upper Tioga River

The tributaries entering the Tioga River north of Blossburg do not suffer from AMD pollution.  While these tributaries help to dilute the AMD polluted waters, the pollution emanating from the upper watershed is so severe that the river cannot recover and cannot support aquatic life.

The Tioga Hammond Dam Complex:

Upper Tioga RiverThe Tioga Hammond Dam was constructed in 1978 and put into operation in 1981 as part of a flood control project.  The unnatural blue-green color that is frequently seen in Tioga Lake is due to the precipitation of Aluminum which results when mine drainage begins to become neutralized by alkaline water.

The Dam complex provides some AMD remediation.  Hammond Lake impounds Crooked Creek and controls a drainage area of 122 square miles.  The water collected in Hammond Lake is alkaline and can be mixed with the polluted waters of Tioga Lake through a 2,700-foot connecting channel. Corps employees at the Tioga Hammond Dam monitor the chemistry and temperature of the lakes.  Using the connecting channel to control the amount of water released downstream from each lake, the Corps is able to control the quality of water north of the Dam thus permitting aquatic life to survive.

The Future:

The Watershed Assessment and Remediation Strategy for Abandoned Mine Drainage in the Upper Tioga River Watershed, compiled by the Susquehanna River Basin Commission, documented the AMD pollution and provided recommendations for corrective action.  The information documented in the SRBC study has been used to develop the narratives for this website and also as the main guide for Tioga River reclamation efforts.  

Updating the plans: Additional information as well as new requirements to qualify for Government funding programs dictate the need to develop an Upper Tioga River Restoration Plan. The TCCCC and our partners are exploring options for the development of this plan which we hope to have completed by mid-2018.

Fall Brook: Southwestern Energy (SWN) funded the construction and O&M Trust for the Fall Brook tributary. The systems went on-line in November of 2015. The water chemistry in the Tioga River from the confluence of Fall Brook to the confluence of Morris Run is now of sufficient quality to support aquatic life. Please refer to the Fall Brook Tributary menu for additional information about this project.

Morris Run: The Morris Run Acid Mine Drainage Restoration Plan was recently completed. Please see the Morris Run Tributary menu for additional information about this project.

Coal Creek: Federal funding opportunities are being explored for restoring Coal Creek. Please see the Coal Creek Tributary menu, Projects Update sub-menu for additional information.

Save The River: In 2015, we started a project called “Save The River”. Each year, we solicit donations to a fund for the future O&M expenses of the treatment systems we plan to build to treat the AMD in Morris Run, Coal Creek, and Bear Creek. O&M expenses must be funded before construction of the treatment plants can begin. Please refer to the Save The River menu to learn more about this project and watch a short video.

We will continue to work with the Pennsylvania Department of Environmental Protection, The Bureau of Conservation & Restoration, the Bureau of Forestry, the Susquehanna River Basin Commission, the Federal Office of Surface Mining, Bureau of Abandoned Mine Reclamation, the United States Army Corps of Engineers, and other interested parties to reclaim the watershed. Through private funding and government grants to fund the engineering, design, and construction of passive and active treatment systems, the planting of trees, and abandoned mine reclamation work, the watershed is slowly being reclaimed. Our goal remains: “Restore aquatic life to the Upper Tioga River Watershed.”


Organizations and government agencies actively involved in the coalition to reclaim the Upper Tioga River Watershed include:

Tioga County Concerned Citizens Committee, Inc. (TCCCC)

Hillside Rod & Gun Club

Southwestern Energy

Tioga County Conservation District (TCCD)

Bureau of Forestry – Tioga State Forest

Ward Township

Blossburg Borough and Municipal Authority

DEP Bureau of Conservation & Restoration (BCR)

DEP Mining

Susquehanna River Basin Commission (SRBC)

Trout Unlimited (TU)