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Vital Statistics

Watershed Area 482 acres
Lake surface area 10 acres
Maximum depth 24 feet
Mean depth 12 feet
Public Park No
Boat Ramp No, no engines
Fish Present


Volunteer monitoring began at Lake Leota in 1998 and continued through 2009, after which it was discontinued. The data suggest that this lake in Woodinville is lightly colored and moderate in primary productivity (mesotrophic) with good water quality. A trend of increase in productivity since 2002 is moderately well substantiated. Alkalinity is in the lower mid-range for King County lakes.

Profile data suggest that thermal stratification is stable through summer, and sediments release phosphorus to deep water , where considerable ammonia signals low oxygen. Nitrogen to phosphorus ratios in the upper water are above 20:1 early in the summer but decline in late summer, which generally favor bluegreens over other algae species.

Lake Leota has no public access points, though residents should keep an eye on aquatic plants growing nearshore to catch early infestations of noxious aquatic weeds. Lake Leota has recently experienced aggressive growth by milfoil identified as native Myrio

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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

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