East Branch Roaring Brook begins in a pond near Freytown, in Sterling Township, Wayne County.

After several tenths of a mile, it turns northwest and reaches its confluence with Roaring Brook at the Hollister Reservoir.

[1] The surficial geology in the vicinity of the lower reaches of East Branch Roaring Brook alluvium, Wisconsinan Ice-Contact Stratified Drift, bedrock consisting of conglomeratic sandstone and sandstone and shale, fill, and sand and gravel pits.

[7] East Branch Roaring Brook was entered into the Geographic Names Information System on August 2, 1979.

[3] The PPL Corporation has received a permit to construct an electric aerial line over East Branch Roaring Brook and nearby wetlands.

[6] Wild trout naturally reproduce in East Branch Roaring Brook from river mile 2.48 downstream to its mouth.

[6] Numerous macroinvertebrate taxa have been observed in East Branch Roaring Brook, including 17 genera from the orders Ephemeroptera, Plecoptera, and Trichoptera.