Big vs Small
garb,
As indicated, break the river down into small manageable sections.
When you fish the small streams you fish the seams and the soft pockets of water, it will be the same in a river.
Look for the seams in the water, those will collect insects both on the surface and under the water. The fish will be near the seams looking for food. Find the soft pockets of water near many of these seams and around the rocks, excellent places for fish.
If you are fishing nymphs, make sure you can get the fly down to the bottom as quickly as possible. Drag free is critical.
Don't try to fish the whole river, just a few small sections at a time.
Go there when you are not pressed for time, have a nice selection of flies, both dry and wet/nymph and enjoy the exploration.
Larry ---sagefisher---
Organizations and clubs I belong to:
Fly Fishers International Life Member
FFI 1000 Stewards member
FFI Presidents Club
FFI Fly Tying Group Life Member
Washington State Council FFI
V.P. Membership
Alpine Fly Fishers Club
President & Newsletter Editor--The Dead Drift
North Idaho Fly Casters club