Temperature, °C
|
Water conditions
|
21
|
Normal river temperature. Water is clear. Many kinds of fish, other animals, and plants thrive.
|
24
|
No obvious change in water quality or organisms living in it.
|
26
|
Almost no fish can reproduce.
|
26.5
|
Many desirable kinds of fish, such as trout, have been killed.
|
29
|
No swimming is allowed.
|
32
|
Most kinds of game fish and most animals that live on the river bottom have been killed.
|
33.5
|
Only carp and catfish survive.
|
35
|
Unpleasant odors and tastes produced by increasing numbers of blue-green algae. Water not fit for drinking.
|
40.5
|
Water can no longer be used by industry for cooling, unless it is first cooled.
|
43
|
The river is dead, except for some algae, bacteria and molds.
|