Potash Creek (Black River tributary)

Swiss Creek flows into the Black River near Naumburg, New York.

The Beaver River is a small mountain stream which flows from the Adirondack Mountains to the Black River at Naumburg, north of Lowville in northwestern New York. The Beaver flows through parts of Hamilton, Herkimer, and Lewis counties. Its source is Lake Lila in Long Lake. Owing to its high gradient as it drops out of the mountains, the Beaver is a favorite destination for whitewater kayakers and canoeists. In September of each year, hundreds of whitewater paddlers descend on the Beaver from all parts of the US and eastern Canada. Also because of its high gradient, there are several hydropower projects along the Beaver's course. These projects, created between 1905 and 1920 have fostered a series of highly productive fisheries in the reservoir chain. Popular among locals, the Soft Maple Reservoir is an excellent Smallmouth Bass fishery. The hamlet of Beaver River at the east end of Stillwater Reservoir, in the town of Webb has a year-round population of three that increases during the summer as many people have camps in this wilderness area. No roads lead to the hamlet; it is accessible only by hiking, rail car or boat in the summer and by snowmobile, snowshoes or cross country skis in the winter.

Castorland is a village in Lewis County, New York, United States; it is north of Lowville and southeast of Carthage. The population was 360 in 2019.

Negro Creek flows into the Black River in Castorland, New York.

Capidon Creek flows into the Black River near New Bremen, New York.

Beaver River Central School is a small K-12 school in Beaver Falls in northern Lewis County. As of 2011, it had a total enrollment of 893 and a graduating class of 66. in 2011, 68% of graduates went on to two-year colleges, technical schools, or four-year colleges. The superintendent is Todd Green, and the high school principal is Daniel Rains.

Adirondack International Speedway (AIS) includes a half-mile and a quarter-mile asphalt oval raceways located in the foothills of the Adirondack Mountains and the Northern Region of New York State. The facility also contains a mud-park.

Beaver Falls Grange Hall No. 554 is a historic Grange hall located at Beaver Falls in Lewis County, New York. It was built in 1892, and is a two-story, wood-frame building measuring 30 feet wide and 60 feet deep. It sits on a fieldstone foundation and has a front gable roof. It features a one-story, hipped roof front porch. The first floor was converted to a store in 1915. It was listed on the National Register of Historic Places in 2015.

Crystal Creek is a stream in Lewis County, New York, USA. The stream flows into the Black River near New Bremen.

Harry and Molly Lewis House, also known as the Fiber Products Research Center, is a historic home located near Beaver Falls in Lewis County, New York. It was built in 1909–1910, and is a 2+1⁄2-story, five-bay, Colonial Revival style masonry dwelling with a rear ell. It has intersecting hipped roofs and features a monumental two-story projecting portico. Also on the property are the contributing garage (c. 1909–1910), workshop (c. 1909–1910), and water system (c. 1909–1910). The house was converted into the Fiber Products Research Center in 1957 supporting the J.P. Lewis paper company. It was listed on the National Register of Historic Places in 2011.

New Bremen is a town in Lewis County, New York, United States. The population was 2,706 at the 2010 census. The town is named after the German city of Bremen. The town is on the eastern side of the county. It is northeast of Lowville, the county seat.

Lewis County General Hospital (LCGH) is a Short Term Acute Care facility in Lowville, New York serving its eponymous county both for medical service and as its largest employer. LCGH is part of "Lewis County Health System".