breast, which was described on the district planning committee's application for National Register placement as "one of the most unusual features of the historic district," is a "stone battered-wall dam breast" which was built "to replace an earlier earthen dam which was apparently washed out during one of the periodic floods on the creek." Mostly destroyed by a flood which occurred sometime around 1860, "a substantial portion of the dam breast still remains on the northwest bank of the creek." The two non-contributing buildings in this district are a single pen, one-story log cabin, which was built circa 1933, and the water control house, a brick structure which was erected in 1960 and was still in use by the City of Lebanon's water department at the time of the district's 1991 placement on the National Register. Later changes to the property and existing structures The ironmaster's mansion was altered further, following the property's 1881 purchase by Mahlon Boyer, who wrapped a porch-veranda around the home's eastern, southern and western sides. The rear of the original 1830 building was then expanded in 1969 with the addition of a one-story laundry room with flat roof. By 1991 when planners were applying for historic district status with the National Register, the home was being operated as a bed and breakfast. In 2016, the Lebanon City Authority, Swatara State Parks, Pine Grove Historical Society, Friends of Memorial Lake, Oak Grove Sportsmen's Association, Old Forge Fishing Club, and Pennsylvania Game Commission joined together to launch a preservation initiative to protect and restore the historic Swatara Forge. References External links Ironmaster's Mansion, Swatara Furnace Historic District (four photos of various external views of the existing mansion structure from the September 6, 1991 registration of the historic district on the National Register of Historic Places, in "Philadelphia Architecture and Buildings." Philadelphia, Pennsylvania: The Athenaeum of Philadelphia, retrieved online August 20, 2019. "Swatara Furnace" (photo of the existing furnace structure from the September 6, 1991 registration on the National Register of Historic Places), in "Philadelphia Architects and Buildings." Philadelphia, Pennsylvania: The Athenaeum of Philadelphia, retrieved online August 20, 2019. SWATARA FORGE - Iron Furnace Ruins on Waymarking.com Industrial buildings and structures on the National Register of Historic Places in Pennsylvania Historic districts on the National Register of Historic Places in Pennsylvania Industrial buildings completed in 1830 Buildings and structures in Schuylkill County, Pennsylvania 1830 establishments in Pennsylvania National