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Green-1 Lake
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Welcome
Wilderness
Yellow
Watershed Area
1875 acres
Lake surface area
259 acres
Maximum depth
30 feet
Mean depth
13 feet
Public Park
Yes
Boat Ramp
No, car top boats OK
Fish Present
bass, carp, stocked RB trout
Water quality monitoring began at two stations at Green Lake in 2005 and continued through 2008. Green-1 is located in the northeast section of the lake over the deepest water. Data suggest that this city lake (Seattle) is nearly colorfree and currently moderate in primary productivity (mesotrophic), with good water quality. Not enough data are available yet to assess trends since the alum treatment in 2004.
Profile data indicate that thermal stratification is not stable through summer, and nutrients are mixed through the water column. Nitrogen to phosphorus ratios are commonly below 20:1, which may favor bluegreens over other algae.
Green Lake is surrounded by a heavily used city park. The lake was treated with aluminum sulfate in 2004 to reduce internal phosphorus loading to control toxic bluegreen algae blooms. There are established infestations of Eurasian milfoil, and water lily that have been the targets of past control activities.
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Bathymetry map unavailable
Watershed map unavailable
Back to top 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. Five year water quality trends
A common method of tracking water quality trends in lakes is by calculating
the “trophic state index” (TSI) (Carlson, 1977). TSI indicators predict the biological
productivity of the lake based on water clarity (Secchi) and concentrations of total
phosphorus (TP) and chlorophyll a (Chlor).
The average of these three TSI indicators during the growing season can be used
to place lakes in one of three broad categories:
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