Flat Brook

Flat Brook is a tributary of the Delaware River that winds through the hilly terrain of Sussex County before joining the main river at Walpack Township. The water flows through varied landscapes of forests, meadows, and rocky outcrops that define the valley.

The stream flows through a region settled for centuries, where early colonists harnessed the water to power mills and farms. Over the decades, the valley experienced growth and change while keeping its role as a vital water source.

The valley shaped by this waterway held deep importance for Lenape communities who used its resources for hunting and gathering. Today, visitors walking through the area can sense how central water has remained to life in this region.

The stream is surrounded by state parks and forest lands that can be explored on natural trails, especially in fall and spring. The banks are mostly accessible, but water can rise quickly after rain, so caution is wise.

The name Flat Brook is deceptive because the water is almost always moving and creates small rapids and cascades along much of its course. The geology beneath the water is quite varied with slate deposits that give the streambed a rough texture.

Location: Sussex County

GPS coordinates: 41.18870,-74.84710

Latest update: December 14, 2025 09:46