salmon fishing destination

It depends.  When the water is high in the Little Salmon, many of the fish will stay in the main Salmon River and not proceed up the Little Salmon.  In low water years or when the spring is cool and snow melts gradually, then they run the Little Salmon, earlier. Because the Snake River below Hells Canyon has regulated flow, there is nothing to slow the fish from reaching Hells Canyon Dam once they pass the confluence with the Salmon River. Early high water - they reach Hells Canyon Dam, first.  Early low water - they run the Little Salmon River, first.  Regardless, timing of the run in both locations will be very close.