North Mill Pond is in Portsmouth, New Hampshire, in New England, one hour north of Boston.
North Mill Pond is connected to the Piscataqua River, just a short distance from the Atlantic. A very active tidal river system allows the North Mill Pond to almost completely empty every tide cycle.
North Mill Pond is a 46 acre, shallow, urban, tidal pond located right in the heart of northern Portsmouth, New Hampshire.
North Mill Pond receives freshwater inflow primarily from Hodgson Brook, which enters the pond from the southwest by passing under a bridge over Bartlett Street, and from storm drains and surface runoff along both northwest and southeast shores. The North Mill Pond also receives a substantial tidal flow during flood tides that enter the pond from the northeast under the bridge at Maplewood Avenue.