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Forbes Lake
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Welcome
Wilderness
Yellow
Watershed Area
471 acres
Lake surface area
7 acres
Maximum depth
30 feet
Mean depth
Not Available
Public Park
Yes
Boat Ramp
No
Fish Present
Not Available
Volunteers began monitoring water quality for this lake in the City of Kirkland in 2006 and continued through 2008. Collected data indicate that this city lake (Kirkland) is medium in water color and moderate to high in primary productivity (threshold eutrophic) with fair water quality.
Profile data suggest that thermal stratification is stable through summer, and sedimentary phosphorus release adds a small amount to deep water concentrations. Nitrogen to phosphorus ratios are commonly at or below 20:1, which can favor bluegreens over other algae, although no toxic events have been identified in the lake.
Although there is no public boat ramp, the public can access the lake for recreational purposes, and residents should watch for introduction of new aquatic weeds to the lake.
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Bathymetry map unavailable
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
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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