Lake Armstrong
- Elevation: 138 feet
- See Lake Armstrong on map
- Search for Lake Armstrong algae
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.
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 |