Mason County, Washington

Potlatch State Park is a 57-acre (23 ha) Washington state park located on Hood Canal near the town of Potlatch in Mason County. The park offers camping, hiking, boating, fishing, shellfish harvesting, beachcombing, and sailboarding.

The Skokomish Indian Tribe, formerly known as the Skokomish Indian Tribe of the Skokomish Reservation, and in its own official use the Skokomish Tribal Nation, is a federally recognized tribe of Skokomish, Twana, Klallam, and Chimakum people. They are a tribe of Southern Coast Salish indigenous people of the Pacific Northwest located in Washington. The Skokomish are one of nine bands of Twana people.

The Skokomish (pronounced ) are one of nine tribes of the Twana, a Native American people of western Washington state in the United States. The tribe lives along Hood Canal, a fjord-like inlet on the west side of the Kitsap Peninsula and the Puget Sound basin. Historically the Twana were hunters, fishers, and gatherers who had a nomadic lifestyle during the warmer months, while living in more permanent homes during the winter months. Today, Skokomish people are enrolled in the federally recognized Skokomish Indian Tribe. Like many Northwest Coast indigenous peoples, the Skokomish rely heavily on fishing for their survival.

Lake Kokanee, also known as Lower Lake Cushman, is a 150-acre (607,000 m²) reservoir on the North Fork of the Skokomish River in Mason County, Washington. The lake is maintained by Cushman Dam No. 2, providing electrical power to the Tacoma Power system.

Cushman Dam No. 2 is a hydroelectric dam on the North Fork of the Skokomish River in Mason County, Washington, United States, forming Lake Kokanee. Built in 1930, its three 27,000 kilowatt generators provide 233 million kilowatt-hours annually to the Tacoma Power system. Along with Cushman Dam No. 1, it is part of Tacoma Power's Cushman Project. Construction began in 1929 and power production began in December 1930. The dam is 575 feet (175 m) long, 8 feet (2.4 m) wide at the top and 40 feet (12 m) at the base. It is 235 feet tall. Its reservoir, Lake Kokanee, is 2 miles (3.2 km) long.

During the Vashon Glaciation a series of lakes formed along the southern margin of the Cordilleran Ice Cap. In the Hood Canal depression, two significant lake stages existed, Lake Skokomish and Lake Hood. Early Lake Skokomish’s surface was at 350 ft (110 m) above sea level, draining across the divide at Shelton, Washington into early Glacial Lake Russell. As the glacier receded northward, this freshwater lake grew in size, until the ice was north of the Clifton channel. With the opening of the Clifton channel, the water dropped to 160 m (520 ft) above sea level. This longer and lower level lake is referred to as Lake Hood. The glacier continued to recede northward until it reached the Poulsbo channel. Here, the water level equalized to Glacial Lake Russell no longer having a separate identify.

The Skokomish River (Twana: squʔquʔ) is a river in Mason County, Washington, United States. It is the largest river flowing into Hood Canal, a western arm of Puget Sound. From its source at the confluence of the North and South Forks the main stem Skokomish River is approximately 9 miles (14 km) long. The longer South Fork Skokomish River is 40 miles (64 km), making the length of the whole river via its longest tributary about 49 miles (79 km). The North Fork Skokomish River is approximately 34 miles (55 km) long. A significant part of the Skokomish River's watershed is within Olympic National Forest and Olympic National Park.

Union or Union City is a small census-designated place in Mason County, Washington, United States. The community lies along the southern shore of the Great Bend of the Hood Canal, near the mouth of the Skokomish River, which flows from the nearby Olympic Mountains. The U.S. Census reported a population of 631 inhabitants in the 2010 census. The ZIP Code for Union is 98592. State Route 106 is the main route through Union, leading to Belfair farther north, and Potlatch and US Highway 101 to the south.

Ink Blot Natural Area Preserve is a Washington state Natural Area Preserve located in Mason County. The preserve totals 153 acres (62 ha), mostly wetlands and Sphagnum bogs in three parallel glacier-formed basins.The preserve was created in 2010 with a purchase by the State of Washington from a private landowner.

Cushman Dam No. 1 is a hydroelectric dam on the North Fork of the Skokomish River in Mason County, Washington, which in derogation of the natural and treaty rights of the Native inhabitants impounded and enlarged the formerly natural Lake Cushman, leading to damage claims in excess of $5 billion and an eventual settlement agreement with the Skokomish tribe that terminates the right to operate the dam(s) after 2048. It was built by Tacoma City Light (now Tacoma Power) in 1924–1926. Tacoma's demand for electricity grew rapidly after World War I. Tacoma City Light's Nisqually River Hydroelectric Project, built in 1912, could not meet the demand and the utility decided to build a new hydroelectric project on the North Fork Skokomish River. The dam and powerhouse first began to deliver electricity on February 12, 1926.It has a concrete arch design and includes 90,000 cubic yards (69,000 m³) of concrete, covering a whole 6,244 feet (1,903 m) of water. Two 21,600 kilowatt generators provide 127 million kilowatt-hours annually to the Tacoma Power system. Construction began on July 7, 1924, under the commissioner Ira S. Davidsson (1918–1940). It has a top width of eight feet (2.4 m) and a base width of 50 feet (15 m), at 275 feet (84 m) high and 1,111 feet (339 m) long. The transmission of electricity to Tacoma, over lines crossing Tacoma Narrows, was activated, or "formally energized", on March 23, 1926, with the push of a button by President Calvin Coolidge in a ceremony at the White House.A second, smaller dam, Cushman Dam No. 2, 3.2 kilometers (2.0 miles) downstream of Dam No. 1, was completed by December 1930.

Amelia is a ghost town in Mason County, in the U.S. state of Washington.A post office called Amelia was established in 1895, and remained in operation until 1901. Amelia Edmonds, an early postmaster, gave the community her name.

The Ridge Motorsports Park is located near Shelton, Washington, approximately 25 mi (40 km) northwest of Olympia, Washington. Ground was broken for the Steve Crawford designed road course on 26 April 2011. The full road course is 2.470 mi (3.975 km) long with 16 turns and a change in elevation of more than 300 ft (91 m) from start to finish. The first event at "The Ridge" was a charity event benefitting local Mason County food banks, held on 10–11 December 2011.The first official race, a Washington Motorcycle Road Racing Association - WMRRA event, was held on 26 May 2012. Subsequent events include championship racing by regional car and motorcycle sanctioning bodies, lapping events by car clubs, motorcycle organizations, and other events. For the 2014 season, turn 13 of the original road circuit was reconfigured to mitigate excessive surface degradation, and the terrain surrounding the road circuit underwent an enormous amount of grading and smoothing prior to the application of topsoil and hydro-seeding, to both enhance the appearance of the facility and to manage runoff. New poured in place concrete barrier walls were constructed to replace temporary barriers, curbing was added in several places and additional new paving was completed. Finally, a large spectator viewing area was created on the upper part of the site. In 2015, an outdoor scale replica kart track was added to the site, named "Olympic Grand Prix", or "OGP". OGP is a 1/5th scale replica of the road circuit, including elevation change. Additionally for 2015, the available paved paddock area was nearly doubled in size. For 2016, electrical power and water systems were brought on line and a bathroom & shower building was completed. Construction of a new motocross facility called "Ridge MX", also began in the spring of 2016, with initial test laps being run on 6 May 2016. An invitational pre-grand opening test event was held on 1 October 2016 and the official grand opening was held on 29 October 2016. In 2020, The Ridge Motorsports park added a chicane to the 2,850 ft (870 m) front straight to slow down superbikes ahead of its inaugural MotoAmerica event on June 26–28. Use of the chicane is optional for each sanctioning body and track day organizer.