Current Conditions Yearly Table View (Accessible)
The table below shows the most recently collected long term fixed station data, as well as comparisons of current conditions with historical averages.
| Select a Year, Sampling Location, and Parameter: | ||
|---|---|---|
2026 Chesapeake Bay Mainstem - Bottom Dissolved Oxygen (mg/L)
Click on hyperlinked stations to view charts of water quality trends.
| Stations | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CB1.0 - Susquehanna River (Conowingo) | 13.5 | |||||||||||
| CB1.1 - Mouth of Susquehanna River | 13.9 | |||||||||||
| CB2.1 - Turkey Point | 13.4 | |||||||||||
| CB2.2 - Still Pond | 12.3 | |||||||||||
| CB3.1 - Gunpowder Neck | 10.3 | |||||||||||
| CB3.2 - Swan Point | 9.1 | |||||||||||
| CB3.3W - Bay Bridge (NW) | ||||||||||||
| CB3.3E - Bay Bridge (NE) | ||||||||||||
| CB3.3C - Bay Bridge (N) | 9 | |||||||||||
| CB4.1C - Kent Point (SW) | 9.2 | |||||||||||
| CB4.1E - Kent Point (S) | ||||||||||||
| CB4.1W - Horseshoe Point | ||||||||||||
| CB4.2E - Tilghman Island | ||||||||||||
| CB4.2C - MD Mid Bay | 9.2 | |||||||||||
| CB4.2W - Plum Point | ||||||||||||
| CB4.3W - Dares Beach | ||||||||||||
| CB4.3E - Mouth of Choptank River | ||||||||||||
| CB4.3C - Dares Beach | 9.4 | |||||||||||
| CB4.4 - Cove Point | 9.5 | |||||||||||
| CB5.1W - Mouth of Patuxent River | 11.6 | |||||||||||
| CB5.1 - Cedar Point | 9.9 | |||||||||||
| CB5.2 - Point No Point | 10.3 | |||||||||||
| CB5.3 - Smith Point | 10.3 |
| Bottom Dissolved Oxygen (mg/l) | |
| 0.0 - 0.2: Anoxia - kills most life | |
| 0.2 - 2.0: Hypoxia - harms bottom organisms | |
| 2.0 - 3.0: Stresses smaller fish and crabs | |
| 3.0 - 5.0: Stresses larger fish | |
| 5.0 - 10.0: Healthy | |
| 10.0 +: Could indicate an algal bloom in summer | |
| - : No Data | |
| Dissolved oxygen (DO) in the water sustains life for Bay organisms. Nutrients, such as nitrogen and phosphorus, from agricultural, sewer/septic and urban sources can fuel algal blooms that can starve the water of DO. DO levels above 5 mg/l are normally sufficient to support most life. More info on: "Our Monitoring Explained" |
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