King County, with funding from the City of SeaTac, maintains data and analysis of Angle Lake under The Lake Stewardship Program. Two sets of residents are involved in volunteering to collect the measurements. Buff & Diane Chace collect "Level I" data which includes: daily precipitation, daily lake level, and weekly Secchi Disk (water clarity), temperature (at 1 meter depth) and other observations. We've been reporting it to the county monthly since 1999. Ed & Jeanne Montry do the "Level II" observations from April to October, which include water samples every other week. The water samples are analyzed at the King County Environmental Lab for a variety of chemical and biological parameters. In addition we are involved in monitoring the lake for the following invasive species, which have the risk of interrupting the native food chain: Quagga mussels, Zebra mussels, and New Zealand mudsnails. This data is collected by Portland State University for the western United States. So far none of these species has been detected on our lake.

On 4/26/08 King County Lake Stewardship Program held routine training for the Angle Lake volunteer monitors. The Montrys and Chaces both received recognition for 10 years in the program. There was new training in how to recognize and sample cyanobacteria blooms which has been a problem for some of the 43 lakes covered by this program. It has not been a problem for Angle Lake, but we are watching. It occurs in nutrient rich conditions so avoid fertilizer runoff from your lake front property. In windblown concentrations it could poison pets who drink from the lake. Click here for further information.

Ed & Jeannie Montry also volunteered for added training on an invasive weed called Brazilian elodea, a class B noxious weed that has been found in 5 King County lakes (including Lake Washington and Lake Sammamish). It travels via boats that visit multiple lakes and can be quite destructive. It can reduce water quality and impede recreational activities. It is sold in some states for aquarium or school lab use but its sale is illegal in Washington. Thus there is a real incentive to catch any infection early and pursue control efforts.