In June 2025 MRSS installed a HOBO connect Temperature Sensor Tracker into the Miami River. It records the water temperature twice daily at 10:30 AM and 10:30 PM. The temperature ranges from approximately 4.5 C in winter to 18.5 degrees Celsius in the heat of summer. Ideal temperature for aquatic life varies. Five to 13 C (cold) is good for trout and salmon and insects like caddisflies and mayflies. From 13 to 20 C (cool) plant life like yellow pond lily and water smart weed, both keystone species for slow moving rivers like the Miami, thrive but there is a moderate risk of disease to salmonids. Insects like water beetles and water striders are active. However at 13 to 20 degree range trout and salmon, can move up stream into the cooler water of the East Sector forest. Over 20 C see plants like fragrant waterlily and warm water fish like sunfish and bass taking over. Dragonflies, however are quite happy at these temperatures.

Miami River Temp Sen 2026-07-20 12_08_48 PDT (Data PDT).xlsx