Rush Brook
Rush Brook
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Rush Brook

Rush Brook is a tributary of the Lackawanna River in Lackawanna County, Pennsylvania, in the United States. It is approximately 5.1 miles (8.2 km) long and flows through Greenfield Township, Scott Township, Carbondale Township, Mayfield, and Jermyn. The watershed of the stream has an area of 6.01 square miles (15.6 km2). The stream is not considered to be impaired and all but its lower reaches are mostly undisturbed. However, Pennsylvania Route 107 is in its vicinity. The stream begins on the Allegheny Plateau and flows through a water gap. It is a perennial stream.

Lakes in the watershed of Rush Brook include Heart Lake and the Rush Brook Reservoir. The stream is the main source of flooding in the borough of Jermyn. A number of bridges have been constructed across the stream. The drainage basin is designated as a Coldwater Fishery and a Migratory Fishery. Wild trout naturally reproduce in a portion of the stream's length.

Rush Brook begins in a wetland in Greenfield Township. It flows south for a short distance before turning southwest for a few tenths of a mile. The stream then turns south-southwest for several tenths of a mile, entering Scott Township and crossing Pennsylvania Route 107, which it begins to flow alongside. It eventually turns southeast for a few miles, entering Carbondale Township. In this reach, the stream enters a water gap through Cary Mountain and possibly another mountain and passes through the Rush Brook Reservoir. It continues flowing alongside Pennsylvania Route 107. Near the end of the water gap, it passes through Mayfield and enters Jermyn and continues flowing southeast for a short distance before crossing Pennsylvania Route 107 and US Route 6. It then turns east-southeast and flows through the streets of Jermyn alongside Pennsylvania Route 107. Several tenths of a mile further downstream, it reaches its confluence with the Lackawanna River.

Rush Brook joins the Lackawanna River 25.24 miles (40.62 km) upriver of its mouth.

Rush Brook has no named tributaries. However, it does have a number of unnamed tributaries. These are known as "Unnamed trip [sic] 1", "Unnamed trib 2", and "Unnamed trib 3".

Rush Brook is not considered to be an impaired stream. It is also a perennial stream.

The peak annual discharge of Rush Brook has a 10 percent chance of reaching 840 cubic feet per second. It has a 2 percent chance of reaching 1780 cubic feet per second and a 1 percent chance of reaching 2360 cubic feet per second. The peak annual discharge has a 0.2 percent chance of reaching 4600 cubic feet per second.

The elevation near the mouth of Rush Brook is 942 feet (287 m) above sea level. The elevation of the creek's source is between 1,640 and 1,660 feet (500 and 510 m) above sea level.

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