So we know Anderson Reservoir is full and whatever will flow into the pool from the upper South Fork Boise River and minor tributaries will have to leave the reservoir.

The above chart shows this year’s flow at Featherville compared to last year’s.  For whatever reason no long-term average flow is shown, which is too bad because this year looks like an average year.  Nonetheless we know this year’s flow is higher than last year, and for the coming weeks what comes in will have to go out of the reservoir.

So what’s a guess on flows for the next month?  We will use the end of May level of snow at Trinity Mountain as a proxy.