Stanislaus River Weir Update #13
March 14 , 2007
 

February 26 through March 11, 2007

A total of 2 Chinook salmon passed upstream of the weir between February 26 and March 11 increasing the season total to 3,067. Total lengths of the two salmon that passed were 538 mm and 941 mm, respectively. Other fish species recorded by the Vaki RiverWatcher included 364 Sacramento suckers and 2 Sacramento pikeminnow (Figure 1).
Figure 1. A group of Sacramento suckers (Catostomus occidentalis) and a Sacramento pikeminnow (Ptychocheilus grandis) passing through the Vaki RiverWatcher at the weir.

One female O. mykiss passed the weir during this sample period (TL: 483 mm) bringing our season total of O. mykiss to pass the weir to 11. 

No salmonid carcasses were recovered from the weir during this sample period.  One common carp carcass was recovered, processed, and then passed downstream of the weir on March 5 (Figure 2).

Figure 2.  An adult common carp (Cyprinus carpio) carcass (FL: 590mm) processed at the weir on March 5.

Environmental conditions at the weir site varied during the sample period (Figure 3). Flow at Orange Blossom Bridge (OBB) ranged from 988 cfs to 1,229 cfs, and flow at Ripon (RIP) ranged from 1,152 cfs to 1,404 cfs. Goodwin Dam (GDW) outflows ranged between 1,213 cfs and 1,511 cfs. Turbidity ranged between 1.76 NTU and 7.12 NTU; and dissolved oxygen (DO) ranged between 10.79 mg/L and 11.97 mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin River's Deep Water Ship Channel ranged between 8.12 mg/L to 10.66 mg/L. Daily instantaneous water temperature at the Stanislaus River weir ranged from 49.3 ºF to 51.9ºF.
Figure 3. Left: The Stanislaus River weir after a morning cleaning; Right: Field technician Garrett Grohl cleaning debris off of the weir. 

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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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