Cushman Dam No. 2

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. 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.

Mason County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 65,726. The county seat and only incorporated city is Shelton. The county was formed out of Thurston County on March 13, 1854. Originally named Sawamish County, it took its present name in 1864 in honor of Charles H. Mason, the first Secretary of Washington Territory.Mason County comprises the Shelton, WA Micropolitan Statistical Area and is included in the Seattle-Tacoma, WA Combined Statistical Area.

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.

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.

Sund Rock is a designated conservation area on the U.S. state of Washington's Hood Canal. The area is known for abundant and diverse life, including but not limited to Lingcod, Giant Pacific Octopus, Wolf Eel, as well as nudibranch, anemone, and sea cucumber. The area is well known to regional scuba divers, especially for its two major walls, known colloquially as the north and south walls. These walls have depths 70 to 80 feet (21 to 24 m), depending upon the tide. Several other walls exist, some going down beyond 100 feet (30 m) in depth. One of these is called "fish pen wall." Additional features include the "fish bowl"—a reef-like area full of life—a large sunken boat just to the north of the north wall, and a small wrecked boat between the north and south walls. Recreational and technical divers alike find Sund Rock attractive for various reasons. Recreational divers appreciate Sund Rock because it is not a current-sensitive area, the main walls are easily within recreational dive limits, and for abundant sea life. Technical divers enjoy the deeper walls and other areas that allow them to dive well beyond recreational limits. Because Sund Rock is a conservation area, no hunting or gathering of any kind is permitted. Two ways exist of entering the waters in the area. One option involves a somewhat steep but short hike and surface swim of 250 to 600 metres (820 to 1,970 ft). An alternative method is to access a private beach nearby. The boundaries of the area are

Octopus Hole Conservation Area is defined as those waters, tidelands, and bedlands of Hood Canal within a line projected due east from the western shore of Hood Canal on latitude 47°27'01"N for 200 yards, thence southerly 628 yards parallel to the high watermark to latitude 47°26'40", thence due west to shore. Similar to the close-by Sund Rock conservation area, Octopus Hole is very popular with scuba divers who enjoy diving the walls associated with the site to view various underwater creatures, including lingcod, giant Pacific octopus, wolf eel, sea cucumber, and nudibranch. The area is well known to regional scuba divers, especially for its two major walls, known colloquially as the north and south walls. These walls have depths of 70 to 80 feet (21 to 24 m), depending upon the tide. Several other walls exist, some going down beyond 100 feet (30 m) in depth. One of these is called "fish pen wall." Additional features include the "fishbowl"—a reef-like area full of life—a large sunken boat just to the north of the north wall and a small wrecked boat between the north and south walls. An alternative method is to access a private beach nearby. Recreational and technical divers alike find Sund Rock attractive for various reasons. Recreational divers appreciate Sund Rock because it is not a current-sensitive area, the main walls are easily within recreational dive limits, and for abundant sea life. Technical divers enjoy the deeper walls and other areas that allow them to dive well beyond recreational limits. Because Octopus Hole is a conservation area, no hunting or gathering of any kind is permitted. Like most sites on the mid to southern Hood canal, this area is not currently sensitive. However, some noticeable current can occur. Such current is not strong enough to significantly affect dive plans or cause problems, but it is strong enough to slow or speed progress, depending upon the diver's direction.

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.

Lilliwaup is a small unincorporated community in Mason County, Washington, United States. It is located on the west shore of Hood Canal at the mouth of Lilliwaup Creek. U.S. Route 101 passes through the town.