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June 2021 Chesapeake Bay Hypoxia Report

Dissolved Oxygen Best on Record for Early June Data collected by the Maryland Department of Natural Resources (DNR) and Old Dominion University show that dissolved oxygen conditions in the Chesapeake Bay mainstem of Maryland and Virginia were better than average in June 2021. The hypoxic water volume — areas with less than 2 mg/l oxygen  Read the Rest…


Late August 2020 Hypoxia Report

Oxygen Conditions Better than Average Maryland Department of Natural Resources monitoring data show that dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem were better than average in late August 2020. The hypoxic water volume — areas with less than 2 mg/l oxygen — was 0.79 cubic miles compared to a historical  Read the Rest…


Early August 2020 Hypoxia Report

Conditions Show Improvement Following Tropical Storm Isaias Maryland Department of Natural Resources monitoring data show that dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem were better than average in early August 2020. The hypoxic water volume — waters with less than 2 mg/l oxygen — was 0.92 cubic miles compared to  Read the Rest…


Early August 2019 Hypoxia Report

Maryland Department of Natural Resources monitoring data show that dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem were larger than average in early August. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 1.77 cubic miles in early August, down from the 2.01 cubic miles seen in late  Read the Rest…


July 2019 Hypoxia Report

Maryland Department of Natural Resources monitoring data show that dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem were larger than average in July, as the result of many factors. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 1.92 cubic miles in early July and 2.01 cubic miles  Read the Rest…


Late June 2019 Hypoxia Report

Maryland Department of Natural Resources monitoring shows that dissolved oxygen conditions in the state’s portion of the Chesapeake Bay mainstem were better than expected in late June. The hypoxic water volume — areas with less than 2 mg/l oxygen — was 0.69 cubic miles, which is well below the late June 1985-2018 average of 1.15  Read the Rest…


Early June 2019 Hypoxia Report

Dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem were slightly above the long-term average in early June. The hypoxic water volume — areas with less than 2 mg/l oxygen — was 1.14 cubic miles, which is slightly above the early June 1985-2018 average of 0.93 cubic miles and similar to levels  Read the Rest…


Summer 2018 Hypoxia Report

Average Year for Chesapeake Bay Dissolved Oxygen Dissolved oxygen conditions for the Maryland portion of Chesapeake Bay for the summer of 2018 were average compared to the long-term average from 1985-2017, reports the Maryland Department of Natural Resources. Low dissolved oxygen volume averaged 0.97 cubic miles from June through September. Crabs, fish, oysters and other  Read the Rest…


August 2018 Hypoxia Report

Dissolved oxygen conditions for Maryland’s portion of Chesapeake Bay returned to near average for the month of August, reports the Maryland Department of Natural Resources. The department tracks hypoxia throughout the summer during twice monthly monitoring cruises. Low dissolved oxygen volume was at a record low (0.26 cubic miles) in late July, due to sustained  Read the Rest…



Late July 2018 Hypoxia Report

Heavy Rainfall and Sustained Winds Helped Produce Best Recorded Results Ever Due to extreme summer weather, dissolved oxygen conditions in Maryland’s portion of the Chesapeake Bay mainstem were the best ever observed in late July, reports the Maryland Department to Natural Resources. The department tracks hypoxia throughout the summer during twice monthly monitoring cruises. The  Read the Rest…


Early July 2018 Hypoxia Report

Dissolved oxygen conditions in Maryland’s portion of the Chesapeake Bay mainstem improved in early July, according to the Maryland Department of Natural Resources. The department tracks hypoxia throughout the summer during twice monthly monitoring cruises. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 1.05 cubic miles, nearly 0.6 cubic miles less  Read the Rest…


Late June 2018 Hypoxia Report

As anticipated, dissolved oxygen conditions in Maryland’s portion of the Chesapeake Bay mainstem worsened in late June. During its twice monthly monitoring cruises, the Maryland Department of Natural Resources found that hypoxic water volume (areas with less than 2 mg/L oxygen) was 1.63 cubic miles, which is 42 percent greater than the late June average  Read the Rest…


Early June 2018 Hypoxia Report

Maryland and Virginia scientists have begun regularly collecting oxygen data as they monitor the health of Chesapeake Bay waters, and track the states’ progress toward restoring the treasured Chesapeake.  The Maryland Department of Natural Resources will track bay oxygen levels throughout the summer during twice-monthly monitoring cruises.


Secretary’s Message: December 2017

A Watershed Year for the Chesapeake Bay When this year began, I knew it held great promise for the future of our most precious natural resource and treasure, the Chesapeake Bay. Maryland is committed to protecting and restoring the nation’s largest estuary, and I’m pleased to say this year we’ve seen strong signs of progress.


Summer 2017 Hypoxia Report

Maryland’s Water Quality Monitoring Data Indicates Second Best Year on Record Dissolved oxygen conditions in Maryland’s Chesapeake Bay mainstem were much better than average this summer, according to Maryland Department of Natural Resources. The results show that 2017 had the second-smallest Chesapeake Bay hypoxic volume (dissolved oxygen concentrations below two milligrams per liter) since 1985, for the regions and times  Read the Rest…


Late August 2017 Hypoxia Report

Dissolved oxygen conditions in a portion of Maryland’s Chesapeake Bay mainstem were better than average for late August, reports the Maryland Department of Natural Resources. The hypoxic water volume (areas with less than 2 mg/l oxygen) in the study area was 0.33 cubic miles, which is much smaller than the late August 1985-2016 average of 0.80 cubic miles for that reduced  Read the Rest…


Early August 2017 Hypoxia Report

Dissolved oxygen conditions in Maryland’s portion of the Chesapeake Bay mainstem were much better than average for early August, reports the Maryland Department of Natural Resources. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 0.91 cubic miles, which is much smaller than the early August 1985-2016 average of 1.31 cubic miles.  Read the Rest…



Early July 2017 Hypoxia Report

Dissolved oxygen conditions in Maryland’s portion of the Chesapeake Bay mainstem were much better than average for early July, reports the Maryland Department of Natural Resources. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 0.78 cubic miles, which is much smaller than the early July 1985-2016 average of 1.3 cubic miles. No anoxic zones (areas  Read the Rest…


Late June 2017 Hypoxia Report

Dissolved oxygen conditions in the Maryland portion of the Chesapeake Bay mainstem continued to be near average in late June, reports the Maryland Department of Natural Resources. The hypoxic water volume (areas with less than 2 mg/l oxygen) was 1.05 cubic miles, which is slightly below the late June 1985-2016 average of 1.09 cubic miles. No anoxic zones (areas  Read the Rest…



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