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Beaver-2 Lake
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Welcome
Wilderness
Yellow
Watershed Area
1037 acres
Lake surface area
62 acres
Maximum depth
54 feet
Mean depth
21 feet
Public Park
Y
Boat Ramp
Y, no gas engines
Fish Present
bass, stocked rainbow
Volunteer monitoring began for the main, south basin of Beaver Lake in the 1980s and continued through 2008.The data collected show that this city lake (Sammamish) is moderately colored and also moderate in primary productivity (mesotrophic), with good water quality. Productivity was stable over the period of data collection. The sensitivity of the lake basin to development is discussed in the Beaver Lake Management Plan and updates.
Thermal stratification appears stable through the summer, and sedimentary phosphorus release adds a small amount to deep water concentrations. Nitrogen to phosphorus ratios are rarely below 20:1, which favors algae other than bluegreens. Some bluegreen species are occasionally present, but have not been identified as toxic to date.
Beaver-2 has a public access boat ramp and a highly used park. Lake users and residents should monitor plants growing nearshore to catch early infestations of noxious aquatic weeds.
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This bathymetric map shows contour lines of equal depth, similar to a topographic map would for mountains and valleys
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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