The tributaries that enter the Snake River between RM 192 and RM 180 typically have temperatures different from the Snake River. The Imnaha and Salmon tributaries typically cool the Snake River in the spring, fall, and winter. During the summer, the tributaries may warm or cool the Snake River. Figure 9 . Difference between the Snake and Imnaha Rivers, 1991-1997.
Positive numbers indicate the Snake River is warmer.
Figure 10 . Difference between the Snake and Salmon Rivers, 1991-1997. Positive numbers indicate the Snake River is warmer. Figure 11 . Temperature difference between RM 192 and RM 180, 1991-1997.