The former NJMC acquired a 116-acre portion of the Kearny Brackish Marsh in 2005 for preservation and management purposes. The Kearny Brackish Marsh lies south of the Sawmill Creek Wildlife Management Area and sits between the Belleville Turnpike (Route 7) and Amtrak Northeast Corridor railroad tracks on the west and south, and the Cayuga Dike along the Hackensack River on the east. Similar to what happened in the Kearny Freshwater Marsh, emergent vegetation has been mostly lost over the past 10 years and replaced by open water. Tidal flow and hydrological connections have been restricted due to surrounding development.