The reservoir draws water from the Delaware in springtime, when river flow normally is abundant, and restores it in the summer, when the flow is usually meager and – compounding the problem – demand for electricity for air-conditioning is high. The reservoir and surrounding parkland offer visitors an opportunity to engage in outdoor activity. In addition, by maintaining an ample Delaware River flow, seawater intrusion into the aquifers that provide drinking water to many South Jersey communities, including Launching facilities are provided for recreational boating, but no gasoline motors are allowed. These lands are themselves part of 2,000 acres (8.1 km ) of open spaces. Located in central Warren County, New Jersey, Merrill Creek Reservoir is a 650-acre (2.6 km²) artificial lake that is surrounded by 290 acres (1.2 km²) of protected woodland and fields. This is one of two lakes in New Jersey where lake trout exist. The depth allows for lake trout to exist and other trout to exist year round. Some of the abundant wildlife around the lake includes The lake is about two hundred thirty-five feet deep, making it the deepest man-made lake in New Jersey. The other is The lake's visitor center features natural history and cultural exhibits and offers environmental education programs for all age groups ranging from pre-K through adults.