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5. Portland Boathouse Dock - River Mile 12.9

Samples from this location tested weekly from May to October

An E. coli count less than 406 is below the health standard set by the Oregon Department of Environmental Quality.

↓ indicates below state health standard
↑ indicates above state health standard
'ND' indicates a non-detection
Sample Collection Date	Temperature	E. Coli Count organisms per 100 ml
07/09/25	74.8°F	6 ↓
07/02/25	70.3°F	11 ↓
06/25/25	68.0°F	11 ↓
06/17/25	71.6°F	5 ↓
06/11/25	70.2°F	6 ↓
06/04/25	65.7°F	4 ↓
05/28/25	62.1°F	11 ↓
05/21/25	58.6°F	6 ↓