Montour Run is a tributary of Fishing Creek in Columbia County, Pennsylvania. It is the last named tributary to join the creek and is 3.1 miles (5.0 km) long. The stream's watershed has an area of approximately 4.7 square miles and is located in Montour Township, Columbia County and Cooper Township, Montour County. The annual load of sediment in the watershed is 4,248,000 pounds (1,927,000 kg), most of which comes from agricultural lands. Minnows live in the stream.