Stanislaus River Weir Update #14
March 28 , 2007
 

March 12 through March 25, 2007

Zero Chinook salmon and  zero O. mykiss passed upstream of the weir between March 12 and March 25.  No fish carcasses were recovered from the weir during this sample period.  Other fish species recorded by the Vaki RiverWatcher included 326 Sacramento suckers, 2 Sacramento pikeminnow, and 2 common carp (Figure 1).
Figure 1. A pair of Sacramento suckers on the left (Catostomus occidentalis) and a Sacramento pikeminnow (Ptychocheilus grandis) along with another pair of Sacramento suckers on the right.

During this sample period technicians Joe Deppen and John Montgomery snorkeled the weir to inspect for any potential problem areas (Figure 2).  They found no potential problems during the survey.  They did collect a fair amount of trash from surrounding areas, as well as help reposition the boat passage cap.  They also observed many Sacramento suckers in the weir area as well as a few juvenile Chinook salmon and juvenile lamprey.
Figure 2. Left: Technicians Joe Deppen and John Montgomery inspecting the weir for damage.  Right: A juvenile lamprey attached to a rock just upstream of the weir.

Environmental conditions at the weir site varied slightly during the sample period (Figure 3). Flow at Orange Blossom Bridge (OBB) ranged from 494 cfs to 773 cfs, and flow at Ripon (RIP) ranged from 674 cfs to 1,221 cfs. Goodwin Dam (GDW) outflows ranged between 502 cfs and 1,006 cfs. Turbidity ranged between 0.69 NTU and 2.97 NTU; and dissolved oxygen (DO) ranged between 9.95 mg/L and 11.90 mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin River's Deep Water Ship Channel ranged between 8.04 mg/L to 9.45 mg/L. Daily instantaneous water temperature at the Stanislaus River Weir increased in range from 52.5 ºF to 56.1ºF.
Figure 3. A view from both banks at the Stanislaus River Weir after a morning cleaning. 

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The Stanislaus River Weir project is funded by the U.S. Fish and Wildlife Service Anadromous Fish Restoration Program and is supported by the USBR, CDFG, and  other local agencies and interests.

   

 

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