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Humidity
Regulating Basin South Dam, also known as Tolt Dam, is a crucial water resource structure owned by the local government in King County, Washington.
Completed in 1962 and designed by Carey & Kramer Consulting Engineers, this earth dam stands at 35 feet tall with a hydraulic height of 29 feet, serving primarily for water supply purposes. Situated along the North & South Fork Tolt River, the dam has a storage capacity of 882 acre-feet, contributing significantly to the region's water management efforts.
Managed by the Federal Energy Regulatory Commission, Regulating Basin South Dam plays a critical role in regulating water flow and ensuring reliable water supply for the surrounding areas. With a high hazard potential, regular inspections are conducted to assess its condition and safety, with the most recent inspection carried out in September 2020. Despite not being state-regulated or inspected, the dam's importance in water supply and hydroelectric purposes cannot be understated, making it a key component in the region's water infrastructure.
As climate change continues to impact water resources, the role of structures like Regulating Basin South Dam becomes even more vital in maintaining water security and resilience. With its strategic location and significant storage capacity, this dam stands as a testament to the importance of sustainable water management practices in the face of evolving environmental challenges.
Year Completed |
1962 |
Dam Length |
250 |
Dam Height |
35 |
River Or Stream |
North & South Fork Tolt River |
Primary Dam Type |
Earth |
Hydraulic Height |
29 |
Drainage Area |
250 |
Nid Storage |
882 |
Structural Height |
35 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
35 |
Regulating Basin South Dam
Regulating Basin West Dam
Tolt River - South Fork
Marcel Lake Dam
Margaret Lake Dam
Dagger Lake Dam
South Fork Tolt Reservoir Near Carnation
Sammamish Lake Near Redmond
Cedar Lake (Masonry Pool) Near Cedar Falls
Chester Morse Lake At Cedar Falls
Howard A Hanson Reservoir Near Palmer
Lake Tapps Near Sumner
Snoqualmie Falls to Plum's Landing
Confluence Of Tye And Foss Rivers To Gold Bar
Confluence With Troublesome Creek To Confluence With South Fork Skykomish River
Confluence With Taylor River To Confluence With North Fork Snoqualmie River
Wagner Bridge To Confluence With Middle Fork Snoqualmie River
Alpine Lakes Wilderness Boundary To Quartz Creek Road