The reservoir is fed by the Upper Hackensack River, the Pascack Brook and Dwars Kill.

Directly to the south is the Oradell Avenue road bridge that crosses the Hackensack River.

There is only one bridge to cross the reservoir, which carries CR 502 (Old Hook Road) over from Harrington Park to Closter.

The reservoir is transversed by a CSX Transportation bridge[4][5][6] carrying crude oil.

[8] The Oradell Reservoir and its tributaries are currently protected with Category 1 water purity status in New Jersey.