Cushman Dam No. 1

{{Use American English|date=January 2025}}

{{Use mdy dates|date=August 2023}}

{{Infobox NRHP

| name = Cushman No. 1 Hydroelectric Power Plant

| nrhp_type = hd

| nocat = yes

| image = Cushman Dam 1.jpg

| caption =

| location = Mason County, Washington, USA

| nearest_city = Hoodsport, Washington

| coordinates = {{coord|47.423063|-123.222377|region:US-WA_type:landmark|format=dms|display=inline,title}}

| locmapin = Washington#USA

| area = {{convert|28|acre}}{{Citation | last1 = Soderberg | first1 = Lisa | date = October 23, 1986 | title = National Register of Historic Places Registration Form: Cushman No. 1 Hydroelectric Power Plant | url = {{NRHP url|id=88002759}} | format = PDF | accessdate = February 19, 2015 }}.

| built = {{start date and age|1924}}

| architect = Tacoma Light Dept.

| architecture =

| added = December 15, 1988

| mpsub = Hydroelectric Power Plants in Washington State, 1890--1938 MPS

| refnum = 88002759{{NRISref|2008a}}

}}

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.{{Citation needed|date=June 2024}} 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.{{cite web |title= Tacoma City Light's Cushman Dam No. 1 on the Skokomish River delivers electricity on March 23, 1926. |publisher= HistoryLink.org |url=http://www.historylink.org/index.cfm?DisplayPage=output.cfm&file_id=5085 |accessdate=2009-07-14}}

It has a concrete arch design and includes 90,000 cubic yards (69,000 m³) of concrete, covering a whole {{convert|6,244|ft|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 {{convert|8|ft|m|spell=in}} and a base width of {{convert|50|ft|m}}, at {{convert|275|ft|m}} high and {{convert|1,111|ft|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.{{cite web |title= Cushman Hydroelectric Project Timeline |publisher= Tacoma Power |url= http://www.mytpu.org/files/library/cushman-timeline-1.pdf |accessdate= 2009-07-14 |archive-url= https://web.archive.org/web/20090508181127/http://www.mytpu.org/files/library/cushman-timeline-1.pdf |archive-date= 2009-05-08 |url-status= dead }}

A second, smaller dam, Cushman Dam No. 2, {{convert|3.2|km|mi|abbr=off|sp=us}} downstream of Dam No. 1, was completed by December 1930.