Lake Armstrong

Lake Armstrong (Snohomish County) is a 30 acre lake north of Arlington, WA. Although the lake’s nearly 370 acre watershed is mostly undeveloped, Lake Armstrong experiences occasional blue-green algae blooms that may produce toxins. Avoid water contact if there are warning signs posted. Lake Armstrong drains into Armstrong Creek, which in turn discharges into the Stillaguamish River.

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Data

Lake	Key	Date	DO mg/L	Temp C	pH	Cond uS/cm	Chl ug/L	Alk mg/L	Turb NTU	NH3 ug-N/L	TN ug-N/L	NO2+3 ug-N/L	TP ug-P/L	SRP ug-P/L
Armstrong	ARM	8/31/09	9.8	20.6	7.7	67.8	5.1	28.3	0.71	< 10	520	< 10	16.9	8.2
Armstrong	ARM	6/23/10	9.08	20.2	7.7	53.2	3.3	21.1	0.58	< 10	480	< 10	25.3	12.1
Armstrong	ARM	7/25/11	8.6	21.2	7.7	55.4	9.2	22.3	0.88	20.6	520	< 10	23.6	9.5
Armstrong	ARM	7/31/12	8.8	21.4	7.5	59.4	3	22.8	NA	25.6	524	117	24.7	7.7
Armstrong	ARM	7/15/13	8.78	22.9	7.4	61.1	4.7	24.5	1.32	< 10	430.2	< 10	15.7	< 3
Armstrong	ARM	7/28/14	8.5	23.5	7.5	62	2.13	24.8	0.47	27.5	484	16.4	15.9	< 3
Armstrong	ARM	7/20/15	8.17	27.4	7.7	66.8	NA	27	0.37	< 10	428	< 10	14.3	< 3
Armstrong	ARM	7/18/16	8.38	22.6	7.2	21.3	3.1	24.7	1.73	13.3	769.1	< 10	21.1	< 3
Armstrong	ARM	7/19/17	8.69	23.1	7.5	61	2.5	23.8	0.555	< 10	362.8	< 10	12.2	< 3
Armstrong	ARM	7/18/18	8.1	24.4	7.9	54.8	2.9	22.3	0.651	< 10	390	13.4	14.1	< 3

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