Airport and my boat doesn't have a shallow draft and my old legs won't let me pull the boat through the shallow riffles so I only went up to the first shallow water which was maybe two miles from the airport launch.
The way those fish act to outside environmental conditions I think which is from experience over the years is that the bite can turn on and shut off from various things as I mentioned in my above post.
Example: We fished several areas early in the morning fishing our way up to where we stopped and didn't do much good until around 10 am when the bite turned on.
I mentioned to my fishing partner that we either hit a good hole or the fish just turned on or both.
This was proven later as we made our way back to the launch after limiting and we came upon several kayakers that in one area of the river we had fished earlier they were dragging stringers and I actually saw a couple of fish being caught as we passed.
The run down there seems to last a very long time and I've caught them as late as mid April down there and caught them as early as before Christmas.
Taking into consideration the amount of fishing pressure and how hard they've been hammered in recent weeks I can see where some spots can be temporarily diminished in the numbers of fish until more fish move in so you just have to be patient and do a lot of practice casts until either they turn on or you hit a full hole, or both.