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Vital Statistics

Watershed Area 409 acres
Lake surface area 16 acres
Maximum depth 37 feet
Mean depth 18 feet
Public Park N
Boat Ramp No, no gas engines
Fish Present


Volunteers monitored Lake Lucerne from the 1980s through 2014. This lake in Maple Valley is very clear, lightly buffered against pH change, and low in primary productivity (high oligotrophic), with excellent water quality that has remained steady since 1998. Total nitrogen appears to be slowly increasing over time. Thermal stratification is stable in summer, but sediments release little phosphorus to deep water, where low ammonia indicates good oxygenation. Nitrogen to phosphorus ratios in the upper water are above 25:1, which does not favor cyanobacteria. No toxic evetns have been identified to-date. Lake Lucerne has no public access points, but does have a history of both milfoil and hydrilla infestations for which control occurred between 1995 and 2007. The last hydrilla plant was found in 2004. Lake users and residents should keep a close eye on aquatic plants growing nearshore for noxious weeds as native vegetation returns.

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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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