Stanislaus River Weir Update #17
May 8 , 2007
 

April 23 through May 6, 2007

Zero Chinook salmon and zero O. mykiss passed through the weir between April 23rd and May 6th. Other fish species recorded by the Vaki RiverWatcher during this sampling period included 442 Sacramento suckers, 107 Sacramento pikeminnow, 89 striped bass, 68 hardhead, 14 common carp, 6 Sacramento blackfish, 5 black bass, 5 catfish, 3 American shad, and 1 goldfish (Figure 1 & 2). 

Figure 1.  Left: A Sacramento pikeminnow (Ptychocheilus grandis); and Right: A school of Sacramento pikeminnow passing the RiverWatcher.
 
Figure 2.  Left: A black bass and a Sacramento sucker passing through the RiverWatcher; and Right: A large striped bass (Morone saxatilis) passing through the RiverWatcher during the mid-afternoon.

The Stanislaus River Weir continued to operate well during this sampling period with flows averaging near 1,500 cfs at the weir site (Figure 3).  Daily weir monitoring operations remained consistent as compared to previous updates. 

Figure 3.  Left: Biologist Ryan Cuthbert taking livebox flow readings on April 25th; Right: The Stanislaus River Weir at 1,500 cfs. (click on the image for an enlarged view)

Environmental conditions at the weir site varied slightly during the sampling period. Flow at Orange Blossom Bridge (OBB) ranged from 1,175 cfs to 1,194 cfs while flow at Ripon (RIP) ranged from 1,360 cfs to 1,419 cfs. Goodwin Dam (GDW) outflows ranged between 1,497 cfs and 1,504 cfs (data source: CDEC). Turbidity at the weir ranged between 1.13 NTU and 2.74 NTU; and dissolved oxygen (DO) ranged between 9.81 mg/L and 11.75 mg/L. At Rough 'n Ready Island (RRI) in the San Joaquin River's Deep Water Ship Channel, DO ranged between 9.61 mg/L to 11.27 mg/L. Daily instantaneous water temperature at the Stanislaus River Weir ranged between 52.8ºF to 57.0ºF.

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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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