Current Conditions Yearly Table View
| Select a Year, Sampling Location, and Parameter: | ||
|---|---|---|
2025 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 | 14.1 | 14.2 | 12.9 | 10.7 | - | 9.7 | 8.1 | 7.8 | ||||
| CB1.1 - Susquehanna River | - | - | 11.1 | 11.1 | 7.6 | 7.65 | 6.8 | 7.35 | ||||
| CB2.1 - Turkey Point | - | 13.9 | 11.1 | 10.3 | 7.9 | 7.7 | 6.5 | 6.4 | ||||
| CB2.2 - Still Pond | - | 13.4 | 10.1 | 7.9 | 6.8 | 4.45 | 3.1 | 4.15 | ||||
| CB3.1 - Gunpowder Neck | - | 12 | 8.5 | 5.7 | 5.6 | 0.45 | 0.5 | 1.35 | ||||
| CB3.2 - Swan Point | - | 11.2 | 8.6 | 6.6 | 5.1 | 0.1 | 0.2 | 1.15 | ||||
| CB3.3W - Bay Bridge (NW) | 11.1 | 6.9 | 9.7 | 0.85 | 5 | 6.35 | ||||||
| CB3.3E - Bay Bridge (NE) | 11.6 | 8.2 | 9.9 | 1.1 | 4.7 | 2.65 | ||||||
| CB3.3C - Bay Bridge | 9.7 | 10 | 10.4 | 6.8 | 2.4 | 0.05 | 0.1 | 0.25 | ||||
| CB4.1C - Kent Point (SW) | 9.9 | 10.2 | 10.8 | 7.1 | 2.2 | 0.1 | 0.1 | 0.1 | ||||
| CB4.1E - Kent Point (S) | 10.8 | 7.3 | 3.7 | 0.15 | 0.1 | 0.2 | ||||||
| CB4.1W - Horseshoe Point | 11.3 | 9.2 | 9.4 | 4.5 | 5.8 | 7.55 | ||||||
| CB4.2E - Tilghman Island | 11.7 | 9.9 | 8.9 | 2.45 | 1.8 | 1.4 | ||||||
| CB4.2C - MD Mid Bay | 11.2 | 10.4 | 10.8 | 7.6 | 2.7 | 0.6 | 0.1 | 0.15 | ||||
| CB4.2W - Plum Point | 11.8 | 9.8 | 8.5 | 4.45 | 6.3 | 4.25 | ||||||
| CB4.3W - Dares Beach | 11.7 | 10.6 | 8 | 2.9 | 4.5 | 4.05 | ||||||
| CB4.3E - Mouth of Choptank River | 10.8 | 7.6 | 2.4 | 0.35 | 0.1 | 0.15 | ||||||
| CB4.3C - Dares Beach | 11.2 | 10.5 | 10.9 | 7.6 | 3.2 | 0.85 | 0.1 | 0.2 | ||||
| CB4.4 - Cove Point | 11.3 | 11 | 9.7 | 7.9 | 4.4 | 1.55 | 0.1 | 0.4 | ||||
| CB5.1W - Mouth of Patuxent River | 12.3 | 10.7 | 11.8 | 10.1 | 9.6 | 6.2 | 0.7 | 7.2 | ||||
| CB5.1 - Cedar Point | 11.3 | 10.9 | 9.6 | 8 | 4.8 | 1.8 | 0.1 | 0.75 | ||||
| CB5.2 - Point No Point | 11.4 | 11.1 | 9.5 | 8.5 | 5.1 | 1.95 | 0.1 | 0.9 | ||||
| CB5.3 - Smith Point | 11.2 | 11.5 | 9.8 | 8.8 | 7 | 3.5 | 0.5 | 2.6 |
| Bottom Dissolved Oxygen (mg/l) | |
 |
0.0 - 0.2 (anoxia - kills most life) |
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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) |
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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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