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.
2026 Chesapeake Bay Mainstem - Bottom Dissolved Oxygen (mg/L)
23 stations available.
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 | - | 13.8 | 10.6 | 10.9 | 8.7 | ||||||
| CB1.1 - Mouth of Susquehanna River | 13.9 | - | 12.1 | 10.1 | 9.6 | 7.5 | ||||||
| CB2.1 - Turkey Point | 13.4 | - | 11.8 | 10 | 9.4 | 7.4 | ||||||
| CB2.2 - Still Pond | 12.3 | - | 10.8 | 9.4 | 7.5 | 3.6 | ||||||
| CB3.1 - Gunpowder Neck | 10.3 | - | 9.3 | 6.8 | 5.1 | 0.65 | ||||||
| CB3.2 - Swan Point | 9.1 | - | 9.5 | 6 | 3.8 | 0.75 | ||||||
| CB3.3W - Bay Bridge (NW) | 10.3 | 9.3 | 6 | 1.55 | ||||||||
| CB3.3E - Bay Bridge (NE) | 11 | 10.6 | 5.5 | 3.85 | ||||||||
| CB3.3C - Bay Bridge (N) | 9 | - | 9.3 | 6.8 | 2.4 | 1.55 | ||||||
| CB4.1C - Kent Point (SW) | 9.2 | 11.9 | 9.3 | 6.9 | 3 | 2 | ||||||
| CB4.1E - Kent Point (S) | 9.7 | 6.9 | 2.7 | 1.5 | ||||||||
| CB4.1W - Horseshoe Point | 10.3 | 10.2 | 6 | 5.6 | ||||||||
| CB4.2E - Tilghman Island | 11.6 | 9.4 | 8.6 | 4.7 | ||||||||
| CB4.2C - MD Mid Bay | 9.2 | 11.9 | 9.9 | 6.6 | 3.8 | 2.25 | ||||||
| CB4.2W - Plum Point | 11.1 | 9.4 | 8.9 | 4.6 | ||||||||
| CB4.3W - Dares Beach | 11.3 | 9.2 | 8.4 | 5.15 | ||||||||
| CB4.3E - Mouth of Choptank River | 9.8 | 7.8 | 3.4 | 2.25 | ||||||||
| CB4.3C - Dares Beach | 9.4 | 11.9 | 9.9 | 7 | 3.9 | 2.35 | ||||||
| CB4.4 - Cove Point | 9.5 | 12 | 9.7 | 7.3 | 4.2 | 2.65 | ||||||
| CB5.1W - Mouth of Patuxent River | 11.6 | 13.5 | 13.8 | 9.7 | 6.2 | 3.8 | ||||||
| CB5.1 - Cedar Point | 9.9 | 11.9 | 9.5 | 6.7 | 4.9 | 2.8 | ||||||
| CB5.2 - Point No Point | 10.3 | 11.8 | 10.1 | 7.3 | 5.9 | 3.25 | ||||||
| CB5.3 - Smith Point | 10.3 | 11.8 | - | 8.6 | 6.3 | 3.8 |
| 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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