During the summer juvenile fall chinook migration from Hells Canyon, the water may be either warmer or cooler downstream. Figure 5 . Positive values indicate warming. Figure 6 . Temperature difference between RM 246 and RM 192, 1991-1997.
Positive values indicate warming.
Although there are seasonal patterns of flow and water temperature at Hells Canyon Dam, the two properties are uncorrelated as illustrated in Figure 7. Figure 7 . Flow vs. temperature from Hells Canyon Dam. Figure 8 . Anatone water temperature vs. Lewiston air temperature, 1991-1997.