Kev- to answer your question, yes they do take into account those fish entering before June 12 and after the end of July. The model they use is just that a model. It is a formula that counts the main portion of the run directly and they then extrapolate those numbers to estimate how many have already entered and how many will enter after they stop formal counts. It does save quite a bit of $$$ because they don't have to have counter on those early and late days where there is only small amounts of fish going through. Hope this clarifies some things!
CM