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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


Volunteers monitored Tuck Lake from 2007-2008 and resumed in 2014. This lake is moderately colored, poorly buffered against pH change, and high in primary productivity (threshold eutrophic) with good to fair water quality. With only three years of data, trends cannot be evaluated yet. Thermal stratification is constant in summer, but sedimentary phosphorus release adds only a small amount to deep water concentrations. Nitrogen to phosphorus ratios in the upper water are often below 25:1 in late summer through fall, which can favor cyanobacteria. In 2008 a highly toxic bloom of Microcystis was identified, which persisted from late summer through December. However, monitoring for algal toxins in 2009 - 2011 showed little recurrence of toxicity. Tuck Lake currently has no public access point, but there is a community beach at the south end of the lake. Residents should watch for early infestations of aquatic noxious weeds such as Eurasian watermilfoil or Brazilian elodea.

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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

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