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Lake Information Page

Lake Tuck

Lake Photo Image
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Continue to monitor nearshore plants to catch purple loosestrife, a regulated Class B noxious weed that has been identified near Tuck Lake. If spotted, notify the King County Noxious Weeds Program.

Vital Statistics

Watershed Area 481 acres
Lake surface area 12 acres
Maximum depth 18 feet
Mean depth feet
Public Park No
Boat Ramp No
Fish Present

Overview

The key takeaways from the 2025 monitoring season are:

• Tuck Lake has clear water with moderate nutrient concentrations and high algal growth. • Long-term trends show that nitrogen concentrations are decreasing over time. • No algal blooms were reported for toxin testing in 2025.

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Maps

lake watershed map
Bathymetry map unavailable
This map shows the area of the watershed relative to the area of the lake. Generally speaking, the larger a watershed is relative to a lake, the greater the influence land use practices on lake water quality.

Click image to enlarge

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Water Quality Data  

Through a combination of efforts by volunteer lake monitors and King County staff, data relating to physical, chemical, and biological aspects of the lake have been collected for most lakes. The King County Lake Stewardship Program analyzes data to track long-term water quality trends in small lakes in western King County.

View or Download Data
Use this tool to view or download data from the lake in tabular format. You can define date ranges and select which parameters to view or download.

Chart Data
Use the charting tool to look at graphs showing single parameters for a single water year at a time.

Water quality over time
A common method of tracking water quality trends in lakes is by calculating the “trophic state index” (TSI) (Carlson, 1977) and testing the values for positive or negative trends over time. TSI indicators predict the biological productivity of the lake based on water clarity (Secchi) and concentrations of total phosphorus (TP) and chlorophyll a (Chlor). Generally at least 8 years of data without major lake management activities are needed to have confidence in a significant trend.

The average of these three TSI indicators during the growing season can be used to place lakes in one of three broad categories:
<40 = oligotrophic (low productivity),
40 to 50 = mesotrophic (moderate productivity)
>50 = eutrophic (highly productive).

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Reports and Related Links

2024 Water Quality Plot
Lake Stewardship Program: 2023 Monitoring Update
Lake Stewardship Program: 2022 Monitoring Update
2021 Tuck Lake Monitoring Report
2020 Tuck Lake Monitoring Report
2019 Tuck Lake Monitoring Report
2018 Tuck Lake Monitoring Report
2017 Tuck Lake Monitoring Report

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For questions about lakes in King County, please contact lakes@kingcounty.gov or call the Water and Land Resources Division front desk at 206-477-4800.