Snowfall is crucial since the Colville River discharge (volume of water per unit time) relies on a snow-melt regime.

The high flow period of the river occurs due to the melting of the previous winter snowpack in the spring.

Ammonia, a toxic substance for aquatic life, has concentrations highest downstream the Chewelah and Colville WWTP discharges.

It has been demonstrated that dissolved oxygen concentrations decrease suddenly downstream from the Chewelah and Colville WWTPs in summer months.

[7] One explanation is that the excess ammonia is taken up by algae causing a decrease in dissolved oxygen content, which may harm aquatic life.

Beavers are known to slow streams, create dams and lodges for improved habitats for other animals and insects, gather silt, store and cool water.

The Land Council hopes these beavers will aid the Colville River's ecosystem along with other water bodies downstream.