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Vital Statistics

Watershed Area 411 acres
Lake surface area 41 acres
Maximum depth 28 feet
Mean depth feet
Public Park No
Boat Ramp Yes, no gas engines
Fish Present bass, stocked rainbow

Overview

The key takeaways from the 2023 monitoring season are:

• Lake Twelve had fairly clear water, with moderate nutrient concentration and low algal growth. • Lake Twelve continues to have contrasting trends. Decreasing nitrogen and chlorophyll concentrations, and deeper Secchi depths (clearer water), all suggest the water quality has been improving. In contrast, phosphorus concentrations have been increasing, an indicator of declining water quality. Further analysis (and likely more data) is needed before making any management recommendations based on these trend results. • An algal bloom was sampled for toxin testing in July. No algal toxins were detected in this sample. • Investigate potential sources of phosphorus that may be leading to increasing trend. • Continue to monitor nearshore plants to catch garden loosestrife, a regulated Class B noxious weed that has been identified near Lake Twelve. If spotted, notify the King County Noxious Weeds Program.

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Maps

This bathymetric map shows contour lines of equal depth, similar to a topographic map would for mountains and valleys. The red 'X' marks the location where water quality samples are taken.
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

Lake Stewardship Program: 2023 Monitoring Update
Lake Stewardship Program: 2022 Monitoring Update
2021 Lake Twelve Monitoring Report
2020 Lake Twelve Monitoring Report
2019 Lake Twelve Monitoring Report
2018 Lake Twelve Monitoring Report
2017 Lake Twelve 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.