Kase Run

Kase Run
Kase Run looking downstream in its lower reaches
Etymology	possibly named after Abraham Kase
Basin features
Main source	pond in West Hemlock Township, Montour County, Pennsylvania 940 feet (290 m)
River mouth	Mahoning Creek in Valley Township, Montour County, Pennsylvania 518 feet (158 m)
Progression	Mahoning Creek → Susquehanna River → Chesapeake Bay
Basin size	7.27 square miles (18.8 km2)
Physical characteristics
Length	4.6 miles (7.4 km)

Kase Run is a tributary of Mahoning Creek in Montour County, Pennsylvania, in the United States. It is approximately 4.6 miles (7.4 km) long and flows through West Hemlock Township and Valley Township. The stream's watershed has an area of 7.27 square miles (18.8 km²). The stream and a number of its tributaries are considered by the Pennsylvania Department of Environmental Protection to be impaired by siltation due to agriculture.

The rock in the watershed of Kase Run is of several rock formations, including the Wills Creek Formation, the Trimmers Rock Formation, the Catskill Formation, the Hamilton Group, and others. The soil series in the stream's watershed include the Leck Kill-Minersville-Calvin series and the Berks-Weikert-Bedington series. Kase Run may have been named after Abraham Kase. It is designated as a coldwater fishery.

Kase Run begins in a small pond immediately south of Styer Road in eastern West Hemlock Township. The stream flows southwest into a valley for approximately 0.25 miles (0.40 km) before turning south and staying in the valley. Further downstream, it turns southwest and then south again before leaving the valley. Here, it turns west and eventually enters Valley Township. It continues west for a distance before turning southwest and crossing Interstate 80. Less than a mile downstream of this point, the stream reaches its confluence with Mahoning Creek.

Kase Run joins Mahoning Creek 4.70 miles (7.56 km) upstream of its mouth.

The water temperature of Kase Run has been described as "not particularly warm or cold" by A. Joseph Armstrong in his book Trout Unlimited's Guide to Pennsylvania Limestone Streams.

Kase Run is considered by the Pennsylvania Department of Environmental Protection to be impaired for its entire length except for its upper reaches. Several of its tributaries are also considered to be impaired. The stream and a number of its unnamed tributaries experience siltation due to agriculture.