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Beaver-1 Lake
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Welcome
Wilderness
Yellow
Watershed Area
324 acres
Lake surface area
12 acres
Maximum depth
55 feet
Mean depth
22 feet
Public Park
Y
Boat Ramp
N, no gas engines
Fish Present
Not Available
Volunteer monitoring began for the north basin of Beaver Lake in 1997 and continued through 2008. Data indicate this city lake (Sammamish) is strongly colored and relatively high in primary productivity (mesotrophic to eutrophic), with fair water quality that appears stable over time. The sensitivity of the lake to development is discussed in the Beaver Lake Management Plan and updates.
Thermal stratification appears stable through the summer, and sedimentary phosphorus release adds to deep water concentrations. Nitrogen to phosphorus ratios are often at or below 20:1, particularly in late summer, which favors bluegreen algae. Bluegreen species are present, but have not been identified as toxic to date.
Beaver-1 has no public access boat ramp, but can be accessed through the channel connecting with Beaver-2. Residents should watch plant populations 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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