Contraindications in the Upper Watershed

The first month of the 2010 water year is done and there is one interesting development in the South Fork Boise River. During October the flows upstream of Anderson Ranch Reservoir were higher than last year (see alternating graph above). The blue line (it’s hard to see) was higher through the month owing to the big storm that blew across the northern Rockies in early October. Trinity Mountain supposedly has 25 inches of snow. So, as that snow melted the meter at Featherville recorded a higher flow than October 2008.

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SFB electrofishing discussed on westfly.com board

Link: SFB electrofishing discussed on westfly.com board

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IDFG Electrofishing South Fork Boise

IDFG crews are on their marking run this week on the South Fork Boise River.  They were to complete the first phase during Tuesday and Wednesday, and then come back next week for the recapture run.

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New water year starts

See the little blue tick mark, just below the red line on the left axis?  That’s where we are as far as water in Anderson Ranch Reservoir so far this water year (water years start October 1st, just like the Federal fiscal year).

We start this water year near the average and pretty well ahead of last year.  And the Snotel site at Trinity Mtn. had 25 inches of snow this morning.  Much of that should melt this month, and soak the ground pretty well.  Good start to the fish and float opportunities in 2010.

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Flows drop to 300 cfs

Flows drop to 300 cfs

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600 cfs

Flows from Anderson Ranch Dam are now at the wadeable 600 cfs.

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Anderson Reservoir draining like last year

Anderson Reservoir is draining at the same rate as last year.

Flows should step down at about the same time as last year in the coming weeks.  Look for 600 cfs soon.

The Boise River reservoir system overall is carrying more water than at this time last year.

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Anderson Ranch flows update

Flows from Anderson Ranch Reservoir are now at the “normal” summer discharge.  Anderson Reservoir will now slowly begin to empty, and the drawdown will increase through the summer.

Flows at the Featherville gage fell below last year’s flows for the 2nd half of June.  So much for the earlier post and predictions.

 

Snow is melted from the Trinity Mtn. station. 2009 was below the average of the 1971-2000 period, but total precipitation was slightly higher.

 

 

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Group photo at the South Fork Boise River clean-up

Group photo at the South Fork Boise River clean-up as part of the Trout Unlimited national stream clean-up day.

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Flows at Featherville

Flows at Featherville on the upper South Fork Boise have settled to about 2,300 cfs and are slightly lower than at this time last year.  However, with Anderson Ranch Reservoir at 99 percent full you can expect water managers to pass all inflows and keep the lower SFB at higher flows for quite some time.

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