Allyn Brook

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Allyn Brook flows into Coginchaug River , which it joins at N 41° 28′ 50″, W 72° 41′ 22″ at OSM node n6185579868, and there 27 km of total upstream flows in. load it's distributaries

Allyn Brook has 2 tributaries.

• Ball Brook, which joins it at N 41° 28′ 51″, W 72° 40′ 36″ at OSM node n6185580273, and 1 km of total upstream flows in.
  load it's tributaries
• (unnamed), which joins it at N 41° 28′ 51″, W 72° 40′ 36″ at OSM node n6185580273, and 697 m of total upstream flows in.
  load it's tributaries