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Thurston County, Washington

The content on the Thurston County website is currently provided in English. We are providing the “Translation” for approximately 10 languages. The goal of the translation is to provide visitors with limited English proficiency to access information on the website in other languages. The translations do not translate all types of documents, and it may not give you an exact translation all the time. The translations are made through an automated process, which may not result in accurate or precise translations, particularly of technical and legal terminology.

Community Planning and Economic Development

Lake St. Clair is a kettle lake with no outlet. It is fed by ground water and some runoff from Eaton Creek to the South.

It is located in the Nisqually Basin, approximately four miles west of the main stem river channel and about six river miles from the mouth. 

The groundwater system is hydraulically connected to McAllister Springs and McAllister Creek to the north. The groundwater contributing area is approximately 40 square miles and enters the lake from the south and the west deep below the surface of the lake. 

Unique and amazing geological mechanisms provide the enormous amounts of groundwater to Lake St Clair from below the ground surface. Read details in the reports below.

 

Fact Sheet  |  See lake levels on our Dashboard  |   2002 Geological Report  |  2012 Hydrogeologist Report  |  Lake Contours map  |  Notes from 8/2013 Community Meeting  |  Speed limit notice  |  County Speed Limit Ordinance 14975