It is an inflow to Newfound Lake, part of the Pemigewasset and Merrimack River watersheds.

Below Bog Brook, the Fowler River is subject to the New Hampshire Comprehensive Shoreland Protection Act.

The primary tributary of the river is Clark Brook, which rises south of Mount Cardigan in the town of Alexandria and drops over Welton Falls.

Chesley Brook joins from the north, at which point the stream valley widens and begins to support small agricultural operations.

This article related to a river in New Hampshire is a stub.