It flows into the Monongahela River northwest of Point Marion, Pennsylvania, approximately three miles north of the Pennsylvania-West Virginia border.

The park grounds include Brown's Hill, the westernmost site from which Charles Mason and Jeremiah Dixon made astronomical observations during the original survey of the Pennsylvania–Maryland border in 1767.

[7] The creek is named for members of the Dunkard Brethren, a pacifist, nonconformist group of Christians who settled in the region during the 18th century and practiced baptism by immersion.

In March 2011, Consol Energy reached an agreement with the US EPA and the State of West Virginia regarding damage done to Dunkard Creek caused by high levels of TDS in the discharge from their Blacksville No.

[12] As part of that settlement, Consol agreed to pay $5.5 million in civil penalties for pollution violations related to the 2009 fish kill.

The settlement also describes requirements for Consol to complete a new, $200 million water treatment system to better control pollution discharges from its active and former mining operations in the area.

In July 2015, Consol Energy reached a settlement with the PA Fish and Boat Commission, agreeing to pay $2.5 million for the damages to the Pennsylvania portion of Dunkard Creek.