Coal Lake
- Elevation: 3383 feet
- See Coal Lake on map
- Search for Coal Lake algae
Coal Lake (Snohomish County) is in the North Cascades on the Mountain Loop Highway (FR 20) and can be reached by taking FR 4060. This tiny, beautiful lake is only a short hike from the road, and is a popular fishing and picnicking spot.
| 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 |
| Coal | COAL | 8/28/13 | 9.3 | 16.2 | 7.8 | 50.7 | 0.7 | 23.8 | 0.28 | < 10 | 56.9 | < 10 | < 5 | < 3 |
| Coal | COAL | 7/30/14 | 10.06 | 15.7 | 7.6 | 52.9 | 0.62 | 25.3 | 0.24 | < 10 | 10.6 | < 10 | < 5 | < 3 |
| Coal | COAL | 7/21/15 | 9.24 | 17.6 | 7.9 | 59.3 | NA | 28 | 0.34 | < 10 | 72.3 | < 10 | 6.3 | < 3 |
| Coal | COAL | 7/11/16 | 10.52 | 10.9 | 7.5 | 57.3 | 0.2 | 46.7 | 0.203 | < 10 | 55.6 | 11.6 | < 5 | < 3 |
| Coal | COAL | 7/24/17 | 9.54 | 15.5 | 7.5 | 50.8 | 0.7 | 23.6 | 0.3 | 12.6 | 36.9 | < 10 | < 5 | < 3 |
| Coal | COAL | 8/8/18 | 9.2 | 17.2 | 7.9 | 53.1 | 0.9 | 25.4 | 0.422 | < 10 | 48 | < 10 | < 5 | < 3 |