Brace Brook is a tributary of the Lackawanna River in Wayne County and Susquehanna County, in Pennsylvania, in the United States. It is approximately long and flows through Mount Pleasant Township and Clinton Township in Wayne County and Forest City in Susquehanna County. The watershed of the stream has an area of . The stream is not designated as impaired. It drains a portion of the Moosic Mountains. The surficial geology in its vicinity consists of alluvium, surface mining land, coal dumps, fill, Wisconsinan Till, and bedrock containing sandstone and shale. A reservoir known as the Brace Brook Reservoir is in the watershed. The stream's drainage basin is designated as a Coldwater Fishery and a Migratory Fishery.
Brace Brook joins the Lackawanna River upriver of its mouth.
The concentration of alkalinity in the watershed of Brace Brook is .
Brace Brook drains a portion of the western side of the Moosic Mountains. Part of the watershed is specifically located on Browndale Mountain, a section of the Moosic Mountains. The stream flows through a "spectacular" ravine downstream of the Brace Brook Reservoir. There is an above-ground water pipeline in the vicinity of Brace Brook.
Part of the watershed of Brace Brook is located upstream of the coal measures. However, there are culm piles at the stream's mouth. The surficial geology along the stream in its lower reaches mainly consists of alluvium, surface mining land, coal dumps, and fill. There are also areas of a glacial or resedimented till known as Wisconsinan Till nearby, and also bedrock consisting of sandstone and shale. Further upstream, the surficial geology in the stream's vicinity mainly consists of Wisconsinan Till, but there are patches of alluvium and near the Brace Brook Reservoir. Bedrock consisting of sandstone and shale lines the sides of the stream's valley in its middle reaches.
Brace Brook is a Strahler number stream.
The Brace Brook Reservoir, which is on Brace Brook, is used as an emergency water supply for Forest City by the Pennsylvania American Water Company.
A reservoir on Brace Brook supplied Forest City with water via gravity as early as the early 1900s. In the early 1900s, the supervisors of Clinton Township, Wayne County requested permission to construct a bridge across the stream on a new road approximately northeast of Forest City. There are a number of old concrete structures on Brace Brook. Additionally, a water filtration plant is located to the south of the stream's mouth.
At the Pennsylvania Fish and Boat Commission meeting on April 15 and 16, 2013, the commission considered adding Brace Brook and a number of other streams to its list of wild trout streams.
There are unofficial walking paths along the side of the ravine through which Brace Brook flows. Additionally, the stream crosses the O&W rail trail via a culvert.
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