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Current Conditions Yearly Table View

Select a Year, Sampling Location, and Parameter:

2022 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 12.2 14.2 13.7 11.6 10.7 8.9 7 7.7
CB1.1 - Susquehanna River - 13.9 13.2 11.5 8.6 6.8 6.05 6.8
CB2.1 - Turkey Point - 14.3 12.9 11.5 8.6 7.7 6.2 6.3
CB2.2 - Still Pond 13.2 11.8 11.8 10.7 8.1 6.5 5.6 5.5
CB3.1 - Gunpowder Neck 10.8 10.4 6.4 5.7 3.6 2.4 4.65 4.4
CB3.2 - Swan Point 10.9 10.4 6 4.3 2.6 1.35 4.35 4.1
CB3.3W - Bay Bridge (NW) - 11.6 9.8 8.7 4.9 3.2 5
CB3.3E - Bay Bridge (NE) - 10.8 9.9 5.3 4.6 3.2 3.85
CB3.3C - Bay Bridge 10.3 10.2 7.1 4 2.4 0.65 0.27 0.21
CB4.1C - Kent Point (SW) 10.4 10.5 7.9 4 2.2 0.42 0.2 0.19
CB4.1E - Kent Point (S) - 7.8 4.4 2.7 1 0.24 0.21
CB4.1W - Horseshoe Point - 10.5 5.5 3.4 2.95 5.2 5.2
CB4.2E - Tilghman Island - 11.7 8.6 7.8 5.2 4.7 5.5
CB4.2C - MD Mid Bay 10.6 10.7 8.2 6.4 2.8 0.8 0.21 0.22
CB4.2W - Plum Point - 9.6 4.8 3.6 4.2 2.2 2.65
CB4.3W - Dares Beach - 10.3 10.8 3.9 1.5 2.5 0.91
CB4.3E - Mouth of Choptank River - 8.4 6.5 3.4 0.99 1.9 0.4
CB4.3C - Dares Beach 10.6 10.8 8.3 6.6 3.7 0.85 0.17 0.47
CB4.4 - Cove Point 10.5 11.2 8.7 8 4.3 1.87 0.34 1.05
CB5.1W - Mouth of Patuxent River 11.8 12.7 11.7 9.8 10 6.5 0.8 5
CB5.1 - Cedar Point 10.3 11.2 8.8 8 4.9 2.3 0.48 1.49
CB5.2 - Point No Point 11 11.3 8.8 8 6.1 2.7 0.8 1.95
CB5.3 - Smith Point 11.1 11.3 9.2 7.8 7 2.95 1.6 2.45

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"