on a scale of 1 to 10. It scored best (10 on a scale of 1 to 10) on fish barriers and canopy coverage and it scored worst (3 on a scale of 1 to 10) for streambank stability and riparian buffering. Of ten sites in the Briar Creek watershed, this location has a priority rank of 6. Glen Brook sometimes has high levels of lead and nitrates. Geography and geology The elevation near the mouth of Glen Brook is above sea level. The elevation of the source is just under above sea level. The mouth of Glen Brook and the land in its vicinity lies over limestone. The rest of the lower reaches of the watershed are over shale. The middle portion and most of the upper portion are on siltstone. Most of the rest of the watershed's upper reaches lie over mudstone. Its uppermost reaches, however, lie on sandstone. Soils in the watershed of Glen Brook include the Chenango Series, which is a well-drained and highly acidic silt loam that is found in the stream's lower reaches. A number of other soils are also found in the watershed. Watershed The watershed of Glen Brook has an area of . The watershed is the easternmost sub-watershed of the watershed of Briar Creek. At least two dams are on Glen Brook. These are known as the Glen Brook Number One Dam and the Glen Brook Number Four Dam. A number of bridges cross Glen Brook. One of these is a concrete slab bridge at the Glen Brook Reservoir. It was built in 1937 and is long. A bridge carrying State Route 1029 was built over the stream north of Berwick in 1989. This bridge is long. History and etymology A reservoir was constructed on Glen Brook in 1890. In the early 1900s, the stream supplied water for the Briar Creek Township, the boroughs of Berwick and Nescopeck, and the village of North Berwick via the Berwick Water Company. It was one of three streams that the company used as a water supply. In the early 1900s, there were two artificial reservoirs on Glen Brook north of Berwick. A third one was under construction around this time. Glen Brook is so-named because it flows through a glen. Biology Trout reproduce naturally on Glen Brook. The stream is considered by the Pennsylvania Fish and Boat Commission to be Class A Wild Trout