 The Nature Conservancy established its Nanjemoy Creek Preserve in 1978, which protects more than in the watershed.There is a large great blue heron rookery located at Nanjemoy Creek.Blossom Point, a part of Harry Diamond Laboratories, and operated by the U.S. Army, is located on Cedar Point Neck, and unexploded ordnance (UXO) may be present within firing fans, which extend into both Nanjemoy Creek and the Potomac River.