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Vital Statistics

Watershed Area 443 acres
Lake surface area 68 acres
Maximum depth 32 feet
Mean depth 19 feet
Public Park Yes
Boat Ramp Yes, no gas engines
Fish Present bass, stocked rainbow


Volunteers monitored Spring Lake from the 1980s-2008 and resumed in 2014. This lake is moderately colored, poorly buffered against pH change, and moderate in primary productivity (mesotrophic) with good water quality that may be rising slowly over time, but cannot be verified because of data gaps. Both phosphorus and nitrogen also appear to be increasing. Thermal stratification is stable in summer, and sedimentary phosphorus release adds to deep water concentrations. Nitrogen to phosphorus ratios in the upper water are mostly above 25:1, which generally does not favor cyanobacteria. Spring was monitored for cyanotoxins from 2009-2011, but levels were below the detection limit. Spring Lake has a public access boat launch, and a moderate infestation of Eurasian milfoil was found in 2001. King County and the community received a grant from Washington Department of Ecology to control noxious weeds, and after the grant the community has continued the control work.

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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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