Angle Lake

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Angle Lake		Go to another lake:

Vital Statistics Overview Maps Water Quality Data Related Links

Vital Statistics

Watershed Area	478 acres
Lake surface area	102 acres
Maximum depth	52 feet
Mean depth	25 feet
Public Park	Y
Boat Ramp	Y
Fish Present	stocked trout, bass

Volunteer monitoring began at Angle Lake in the 1980s and continued through 2008. Collected data show that this city lake (SeaTac) is very clear and moderately low in primary productivity (high oligotrophic), with very good water quality. There is no significant trend found in level of productivity from 1994 to 2008.

While thermal stratification appears to be stable through the summer, sedimentary phosphorus release is minimal from the sediments. Nitrogen to phosphorus ratios very rarely fall below 20:1, thus favoring algae other than bluegreens, which are sometimes found in small numbers in the fall.

Angle Lake has a public access boat ramp. Lake users and residents should monitor aquatic plants growing nearshore to catch early infestations of Eurasian milfoil, Brazilian elodea, or other noxious aquatic weeds.

Maps


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

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.

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:
<40 = oligotrophic (low productivity),
40 to 50 = mesotrophic (moderate productivity)
>50 = eutrophic (highly productive).

Angle Lake

Vital Statistics

Overview

Maps

Water Quality Data

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