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6. Morrison Bridge - River Mile 12.7

Samples from this location tested monthly

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
04/01/26	51.3°F	5 ↓
03/04/26	48.0°F	13 ↓
02/04/26	45.3°F	12 ↓
01/07/26	46.0°F	81 ↓
12/11/25	51.4°F	290 ↓
12/04/25	48.2°F	16 ↓
11/05/25	53.1°F	62 ↓