When South Fork Flows Drop: A History Lesson and a Prediction

This is the time of summer when thoughts and conversations among fly anglers turn to the question of when Anderson Ranch Dam flows will drop from the summer boating flows to the wading flows of late summer and fall.

You might hear hushed, brief conversations at the fly shops.  The USGS and Bureau of Reclamation river flow web pages get more looks.  People start to look at some days in September they can block on their calendar.

Unlike the precision of Friday night lights coming on the last weekend in August for high school football, the exact days for the flows dropping is different year to year.  Our prediction is after the jump:

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Updated format for southforkboise.org

After a few weeks of work we now have launched an updated version of southforkboise.org.

Our goal is to have a website where we can incorporate news and updates more frequently.  At the same time we will keep many permanent resources available for people who want to look at data and studies about the South Fork Boise River.  All the updates from the southforkboise.tumblr.com page have been brought over.  The tumbler page is now retired.

A culvert replacement project will be launched this fall at Pierce Creek, funded in part by the Southwest Idaho Resource Advisory Committee.  We will report developments on that project and in the coming weeks project an update on river flows and projections for the future.

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South Fork flows steady but high; reservoir still filling

We are holding steady at 2,000 cfs from Anderson Ranch Dam.  Anderson Reservoir is now 98 percent full and should top off in the next week.

The slow, steady melt this year has been rather amazing.  Despite a dry 2010 water was saved and we entered 2011 with reservoir contents in pretty good shape.  Lots of snow this year, but a slow melt, has meant the pools are filling slowly in May and June.  Today the pool finally fills to the point to equal that of last year.  But this year it is still filling and in 2010 by the first week of July the reservoir was starting to drop.  Check out the chart –

Indications point to ending the year with more water than a year ago.  And 2010 was slightly higher than average.

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More SF Boise video from On the Rise

The second to last episode of On the Rise includes some additional video of fishing on the South Fork Boise River.

More on the Snow and the Flow

It’s the 20th of June, almost summer.  There is more water (frozen) at the Trinity Mountain snow site than there ever was in 2010.

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