Sinlahekin Dam No 1, also known as Forde Lake, is a state-owned earth dam located in Loomis, Washington. Completed in 1949, this dam serves primarily for recreational purposes, offering a serene setting for outdoor enthusiasts to enjoy activities such as fishing and boating. Situated on Sinlahekin Creek, the dam has a hydraulic height of 14 feet and a structural height of 12 feet, with a storage capacity of 333 acre-feet and a surface area of 83 acres.

Managed by the Washington Department of Ecology, Sinlahekin Dam No 1 has a high hazard potential but is currently in satisfactory condition. With its stone core and rock-soil foundations, the dam supports the surrounding ecosystem while providing essential water resources for the region. Its proximity to the Okanogan National Forest offers visitors a chance to connect with nature and appreciate the importance of preserving our water sources in the face of climate change.

As a vital infrastructure in Okanogan County, Sinlahekin Dam No 1 undergoes regular inspections to ensure its safety and functionality. With its location in a picturesque landscape and its role in supporting recreational activities, this dam serves as a reminder of the delicate balance between water resource management and environmental conservation. For water resource and climate enthusiasts, Sinlahekin Dam No 1 is a symbol of the ongoing efforts to protect and sustainably utilize our precious natural resources.