The 3,600 acre Mountain Lake Watershed lies entirely in Liberty Township. It includes Warren County’s largest (122 acres), natural, glacial lake, Mountain Lake. The organization literally grew up around the lake with local property owners forming the backbone of the group. Around 2000, as the watershed movement was beginning to take hold, By Laws were rewritten to reflect that greater perspective. The MLCA was incorporated in 1967, received IRS non-profit status in 2004. The group maintains affiliations with the North American Lake Management Society (NALMS), New Jersey Coalition of Lake Associations (NJ COLA), Paulinskill-Pequest Watershed Association and The Ridge and Valley Conservancy.