People talk about the run as if it were a door opening. It is closer to a wave with a long shoulder: a first push of fish, a steep rise, a peak that lasts a matter of days rather than weeks, and a long declining tail in which the fish that remain are not the fish that came first. Three pages follow that shape, because almost every practical question about this drainage, from where fish hold to what is legal on a given day, has a different answer at each stage.
The first push
Early fish are the ones the whole season is judged on, and they are the ones about which least is known while they are happening. Forecasts exist, and forecasts are estimates made before anything has been counted. The first coming is about what the beginning of a run looks like, why the earliest fish matter out of proportion to their number, and why a slow start is not yet information.
The peak, and management by the day
At the peak the fishery stops being governed by a printed schedule and starts being governed by in season decisions taken on the current count. Openings and closings are issued while you are on the water. Peak weeks explains what those instruments are, who issues them, and why the answer to "is it open" can genuinely be different in the morning and in the evening.
The tail
Late in a run the water is usually lower and colder, the early species are done, later species are arriving, and the fish still moving have changed physically: colour, shape and condition all shift as a salmon commits to spawning. The late run is about that transformation and about reading a drainage at the end of its season rather than at its height.
No numbers here either
This section prints no count, no forecast and no escapement goal. All three are published by the Alaska Department of Fish and Game and by the Board of Fisheries, and all three are revised. What the almanac can usefully add is the shape and the machinery. How the counting itself works is set out in reading the water.