The Magothy River Index provides an assessment of the health of the tidal river for communication to the residents of the watershed. Data for the index are collected at seven mainstem stations and at up to 15 shallow water stations by volunteers who sample every two weeks between mid-April and mid-October. The Index is based on three parameters:

  1. water clarity, calculated as the percent of the time that Secchi Disk Depths are greater than or equal to 1 meter
  2. the percent of the time that the dissolved oxygen concentrations are at least 5 mg/L in the deepest water at each station
  3. the coverage of submerged aquatic vegetation.

In 2017, The Magothy River Index (Download Report) was 22% due to a decrease in dissolved oxygen concentrations and water clarity.


Magothy River Index 2017


Download past Magothy River Index reports below