Lake Tye water depth: A frequently asked question regarding Lake Tye is how deep is the lake. The lake level fluctuates by approximately 3’ seasonally. Abathymetric survey was done on the south half of the lake in 2012. At that time the lake, at its deepest point, was roughly 29’ deep. The city raises the lake level by about 3’, between April and October, during the warmer months of the year. Lake Tye is approximately 40 acres in size. Please contact the City Stormwater Compliance Coordinator, at firstname.lastname@example.org or 360-863-4552, with any additional questions.