North Fork Watershed is located in Northern Jefferson County, Pennsylvania.  The North Fork Creek joins Sandy Lick at Brookville to form the Redbank Creek.  The area that drains to these streams is called the North Fork Watershed.  This watershed is a part of a much larger area known as the Allegheny River Basin.  The North Fork Watershed covers approximately 98.75 square miles with 713 miles of stream and 32.52 square miles being State Game Lands. 

In January of 2000, a group of concerned citizens with a common goal joined together to protect this watershed thus forming the North Fork Watershed Association.  The members strive to protect this water supply in addition to raising watershed awareness and addressing the problems that are presently deteriorating the health of the watershed.  The ability to sustain suitable populations of aquatic organisms is a definite concern of the group.

Macroinvertebrate sampling is done twice a year by volunteers to identify the aquatic life present.  Electro-fishing is done occasionally to monitor fish populations.  These studies are used to help assess health of the stream.