Slight decreases in water clarity and dissolved oxygen led the Magothy River in Anne Arundel County, Maryland, to receive a “D” grade for the second year in a row, according to the Magothy River Association. While the river’s health has improved somewhat in recent years, the score of 33 percent remains well below the 80-percent threshold needed for an “A” grade.
The Magothy River Association’s “Magothy River Index” assesses the river’s health according to three indicators: water clarity, dissolved oxygen and underwater grasses. While both water clarity and dissolved oxygen decreased from 2014 to 2015, underwater grasses improved slightly after several years without growth.
Bacteria in the river remained at generally safe levels during the summer of 2015, although the report card stresses that swimming after a rainfall event is not recommended, as heavy rains can wash polluted runoff and pet waste into local waterways.
Since 2003, the Magothy River Association has used scientific data from agencies and volunteer monitors to develop the Magothy River Index. For more information, visit the Magothy River Association’s website.
The Magothy River in Anne Arundel County, Md., received a D-minus on its latest health report card, the same grade as last year but a significant decline from several years ago, according to the Magothy River Association’s latest Magothy River Index.
The index assesses the river’s health according to three indicators: water clarity, dissolved oxygen and bay grasses. Bay grass acreage in the river decreased in 2007 and water clarity diminished in 2008. Scores for both have remained low ever since.
Low dissolved oxygen at the surface of several creeks is also a problem in the river. Upper Mill and Dividing creeks had the worst surface dissolved oxygen, suggesting that pollution problems that lead to low oxygen levels are worse in those areas.
Despite the low scores, the Magothy River Association is looking to the future to help restore the river. The group is working with scientists to explore if any native species of bivalves other than oysters could be used to help clean up the river. Bivalves can help filter algae out of the water as they feed, but oysters can’t live in many parts of the Magothy because the water is too fresh. One species that may help is dark false mussels, which helped improve water clarity and bay grass acreage in one Magothy River creek in 2005 when they were abundant.
The Magothy River Association also encourages its members and area residents to take small steps to help reduce pollution to the river. Planting more native trees and flowers, installing rain gardens, reducing use of lawn fertilizer and maintaining septic systems are a few of the tips the group suggests. These practices will help reduce pollution no matter where you live.
The Magothy River Index is an annual health report developed by Dr. Peter Bergstrom, a NOAA scientist and Magothy River Association member. The index uses scientific data from state agencies and volunteer water quality monitors. The Magothy River Association has released the index each year since 2003.
For more information, visit the Magothy River Association’s website.