Lake Surprise[1] is a reservoir made by Surprise Lake Dam[2] on the Blue Brook in Watchung Reservation.

On the border of Berkeley Heights and Mountainside in Union County, New Jersey, the lake was created in 1845[3] for David Felt's papermill.

The Union County Park Commission bought the property for inclusion in the Watchung Reservation[when?]

and named it Lake Surprise, due to the winding road park planners paved, on which a visitor's view of the lake is obscured until the visitor is right next to the lake.

This Union County, New Jersey state location article is a stub.