Montour Run is a tributary of Fishing Creek in Columbia County, Pennsylvania.

The stream flows east for a short distance and passes a landing strip, roughly following U.S. Route 11, before turning east-southeast and receiving an unnamed tributary from a quarry.

The stream passes through a pond and crosses under Pennsylvania Route 42 before turning east-southeast and reaching its confluence with Fishing Creek near Rupert.

A 28.2% reduction in the load would be required for the stream to meet the Pennsylvania Department of Environmental Protection's standards.

[4] The average annual rainfall in the Montour Run watershed between 1976 and 1992 was 39.4 inches (100 cm).

[2] The watershed of Montour Run is located in the ridge and valley physiographic region of the Appalachian Mountains.

13.1% of the land is classified as "low-intensity development" by the Pennsylvania Department of Environmental Protection and 0.7% of the watershed is wetland.

[4] There are NWI wetlands and steep slopes on the lower reaches of Montour Run.

[8] Montour Run is considered by the Pennsylvania Department of Environmental Protection to be a coldwater fishery.