The Clarion Watershed (HUC 05010005) covers an area of approximately 2,114 square miles in the northwestern part of Pennsylvania. The watershed is characterized by a mixed forest and agricultural landscape, with diverse hydrological conditions, including high and low gradient streams, wetlands, and reservoirs. Snowpack in the region is often variable and can impact the timing and volume of spring runoff. Surface water in the watershed is affected by factors such as land use and development, which can lead to erosion and sedimentation. Reservoir constituents include fish, wildlife, and aquatic vegetation, along with water quality parameters such as dissolved oxygen and nutrients. Interesting climatic facts and trends include the potential for ice jams during winter months and increased instances of flooding due to extreme precipitation events.