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Soap Lake, Washington

Soap Lake
Soap Lake, Washington
Welcome sign in Soap Lake
Welcome sign in Soap Lake
Location of Soap Lake, Washington
Location of Soap Lake, Washington
Country United States
State Washington
County Grant
 • Total 1.25 sq mi (3.24 km2)
 • Land 1.25 sq mi (3.24 km2)
 • Water 0 sq mi (0 km2)
Elevation 1,106 ft (337 m)
Population (2010)[2]
 • Total 1,514
 • Estimate (2014)[3] 1,585
 • Density 1,211.2/sq mi (467.6/km2)
Time zone Pacific (PST) (UTC-8)
 • Summer (DST) PDT (UTC-7)
ZIP code 98851
Area code(s) 509
FIPS code 53-65345
GNIS feature ID 1512667[4]
Website City of Soap Lake

Soap Lake is a city in Grant County, Washington, on the shores of Soap Lake. The population was 1,514 at the 2010 census. In 2002, the city announced preliminary plans to construct the world's largest lava lamp (60 feet in height) as a tourist attraction.


  • History 1
  • Tourism 2
  • Geography 3
  • Climate 4
  • Demographics 5
    • 2010 census 5.1
    • 2000 census 5.2
  • References 6
  • External links 7


Soap Lake was officially incorporated on June 9, 1919.

The choosing of the town’s name ended the battle between two rival factions. One group had platted a town site and called it Siloam in 1905; while another faction named their town-to-be Cottage City on 1908. The name Soap Lake came from the word Smokiam, an Indian term which translates to “Healing Waters.” The tribes used the lake for healing purposes for themselves and their animals for many years before the area was settled by pioneers.[5]

At that time, Soap Lake was already a busy resort and health spa. It contained four hotels and many rooming houses and businesses catering to sojourners seeking a cure. The residents were very proud of the two-room schoolhouse built in 1907. Even though Soap Lake’s main industry was derived from the medicinal lake, it became a social center. In its heyday celebrations, socials, and gatherings where held continuously. Especially well known were the open-air dances, which would draw participants from miles around.

This came to a halt during the Depression; drought hit Soap Lake. Because of the lack of water and the lack of money, the tourist trade dwindled. But, when Grand Coulee Dam was built, the irrigation canals brought new life into the area. Soap Lake has been internationally known during the past century for its uniquely mineral-rich (23) waters and mud. Many people believe the water and mud to be successful in treatment of a variety of aliments. From the early 1900s to the mid-1940s there were a number of sanitariums located on Soap Lake.

These early versions of spas were used by visitors from all over the country and the world. When the sanitariums, hotels, and bath houses were full, people slept in tents, and even under their cars, in order to use the water of the lake. In 1933, the Veteran’s Administration sent nine veterans, under a special project, to Soap Lake for treatment of Buerger's disease. In November 1938, McKay Hospital was completed. For a number of years, McKay was used as a research center for the study of the therapeutic effect of the water of the lake and the climate.

City of Soap Lake

Soap Lake is located in the center of the state of Washington, 20 miles north of Interstate 90 between Seattle and Spokane, sitting in a desert environment with nine inches or less of rainfall per year and 320 days of sun. The current population is approx. 1,740 people. Soap Lake is formed at the end of a chain of lakes running down the center of the Lower Grand Coulee. The Lower Grand Coulee is over a mile and a half wide in places with sheer basalt rock walls rising 900 feet over the coulee floor. State Highway 17, Coulee Corridor-National Scenic Byway, runs through Soap Lake and up the floor of the canyon heading towards Grand Coulee Dam and Canada.

Of the five lakes existing along the Coulee Corridor, Soap Lake has the highest mineral content. The first layer of Soap Lake is made up of about 81 feet of mineral water; the second level is mud-like and consists of a stronger mineral composition with concentrations of unusual substances and microscopic life forms. The lake’s two layers have not mixed in thousands of years. The scientific community refers to lakes with this rare condition as meromictic. With only 11 meromictic lakes in the United States, Soap Lake is likely the most radical of all. The scientific community is currently exploring the lake to document some of the unusual qualities. The mineral content of Soap Lake water has been analyzed many times throughout the last 95 years. Concentration of different minerals has changed throughout this time. The most recent analysis was conducted in 2000.

In 1950, Soap Lake became a city of Third Class. The population in 1952 was 2051, which grew to 2580 in 1955. At this time the lake was becoming increasingly diluted, due to the seepage of these same life-giving irrigation canals. The City Council petitioned the Department of the Interior to remedy this situation. The Bureau of Reclamation built several wells and pumps to intercept the seepage water, and the end of the 1950s diminished the dilution.


The city is currently trying attract tourism by trying to revive the health aspect of the lake to attract the spa crowd. The minerals in the lake are said to have healing properties for Buerger's disease. Two older brick buildings along the main street northbound have been renovated to house an art museum and a coffee shop.

Another tourism effort is to install a novel roadside attraction: a 52,000 pound lava lamp, formerly a Target advertisement in Times Square.[6][7][8] That effort was profiled in the 2010 documentary film, World's Largest.[9]


Soap Lake is located at (47.388341, -119.487611).[10]

According to the United States Census Bureau, the city has a total area of 1.25 square miles (3.24 km2), all of it land.[1]


Climate data for Soap Lake, Washington
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 61
Average high °F (°C) 34
Average low °F (°C) 22
Record low °F (°C) −22
Average precipitation inches (mm) 0.83
Source: The Weather Channel[11]


Soap Lake Public Library

2010 census

As of the census[2] of 2010, there were 1,514 people, 740 households, and 350 families residing in the city. The population density was 1,211.2 inhabitants per square mile (467.6/km2). There were 977 housing units at an average density of 781.6 per square mile (301.8/km2). The racial makeup of the city was 86.0% White, 1.0% African American, 1.9% Native American, 0.6% Asian, 7.7% from other races, and 2.8% from two or more races. Hispanic or Latino of any race were 11.8% of the population.

There were 740 households of which 20.3% had children under the age of 18 living with them, 33.2% were married couples living together, 10.1% had a female householder with no husband present, 3.9% had a male householder with no wife present, and 52.7% were non-families. 44.5% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.79.

The median age in the city was 48.8 years. 19% of residents were under the age of 18; 8.5% were between the ages of 18 and 24; 18% were from 25 to 44; 30.4% were from 45 to 64; and 24.2% were 65 years of age or older. The gender makeup of the city was 48.9% male and 51.1% female.

2000 census

As of the census of 2000, there were 1,733 people, 778 households, and 427 families residing in the city. The population density was 1,434.0 people per square mile (553.0/km²). There were 996 housing units at an average density of 824.2 per square mile (317.8/km²). The racial makeup of the city was 90.02% White, 0.87% African American, 1.21% Native American, 0.23% Asian, 3.92% from other races, and 3.75% from two or more races. Hispanic or Latino of any race were 11.77% of the population.

There were 778 households out of which 22.2% had children under the age of 18 living with them, 40.6% were married couples living together, 10.3% had a female householder with no husband present, and 45.0% were non-families. 38.8% of all households were made up of individuals and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.91.

In the city the population was spread out with 23.9% under the age of 18, 7.1% from 18 to 24, 21.0% from 25 to 44, 23.1% from 45 to 64, and 24.9% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 90.2 males. For every 100 females age 18 and over, there were 86.8 males.

The median income for a household in the city was $20,459, and the median income for a family was $25,000. Males had a median income of $27,656 versus $21,771 for females. The per capita income for the city was $13,753. About 26.3% of families and 30.6% of the population were below the poverty line, including 50.5% of those under age 18 and 15.2% of those age 65 or over.


  1. ^ a b "US Gazetteer files 2010".  
  2. ^ a b "American FactFinder".  
  3. ^ a b "Population Estimates".  
  4. ^ "Soap Lake".  
  5. ^
  6. ^ Roadside America web site
  7. ^ Soap Lake pins hope on giant lava lamp Seattle P-I, January 1, 2005
  8. ^ Soap Lake to spend $100,000 to install lava lamp Seattle P-I, January 26, 2006
  9. ^ World's Largest, official film site
  10. ^ "US Gazetteer files: 2010, 2000, and 1990".  
  11. ^ "The Weather Channel". 2009. Retrieved 2009-08-30. 
  12. ^ "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015. 
  13. ^  

External links

  • Soap Lake... Washington's Health and Art Resort
  • Soap Lake Lava Lamp
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