Sechler Run

Sechler Run
Sechler Run in Danville
Basin features
Main source	Cooper Township, Montour County, Pennsylvania
River mouth	Mahoning Creek in Danville, Pennsylvania 459 ft (140 m)
Progression	Sechler Run --> Mahoning Creek --> Susquehanna River --> Chesapeake Bay
Basin size	7.6 sq mi (20 km2)
Tributaries	Right: Blizzards Run
Physical characteristics
Length	4.6 mi (7.4 km)

Sechler Run (also known as Sechler's Run) is a tributary of Mahoning Creek in Montour County, Pennsylvania, in the United States. It is 4.63 miles (7.45 km) long. The stream flows through Cooper Township, Mahoning Township, and Danville. Its only named tributary is Blizzards Run.

A. Joseph Armstrong described Sechler Run in Danville as "on the whole uninviting" in his book Trout Unlimited's Guide to Pennsylvania Limestone Streams.

Sechler Run begins in Cooper Township, near the community of Ridgeville. It flows west and slightly south and leaves Cooper Township after a short distance. Upon leaving Cooper Township, the stream enters Mahoning Township and continues flowing southwest, crossing under U.S. Route 11. It then turns northwest, crossing U.S. Route 11 again, and turns west, entering Danville after some distance. In Danville, the stream crosses U.S. Route 11 again and then crosses Pennsylvania Route 54. It reaches its confluence with Mahoning Creek shortly afterwards.

Blizzards Run is the only named tributary of Sechler Run. It is 1.38 miles (2.22 km) long. It flows under two railroads in Danville and reaches its confluence with Sechler Run near where the Danville Structural Tubing Company's plant stood in the early 1900s.

The elevation of Sechler Run at its mouth is 459 feet (140 m) above sea level. The stream is channelized in Danville, sometimes with concrete. The water temperature on the stream in this location is warm, but the waters are cooler in the upper reaches of it.

Rock formations in the southernmost reaches of the watershed of Sechler Run include the Trimmers Rock Formation and the Hamilton Group. Further north in the watershed are the Bloomsburg and Mifflintown Formation undivided, the Wills Creek Formation, the Onondaga/Old Port Formation, and the Keyser and Tonoloway Formation Undivided. The Clinton Group is found yet further north in the watershed.