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January
29 through February 11, 2007
A total of 7 Chinook passed
upstream of the weir between January 29 and February 11
increasing the season total to 3,063 (Figure 1). Chinook daily passage
counts ranged from 0 to 2 fish. Total-lengths ranged from
601
mm to 1,016 mm (avg =
831
mm). Other fish species observed
included many Sacramento suckerfish and
a few Sacramento pikeminnow (Figure 2).
 
Figure 1. A large adult male Chinook
(TL: 1,016mm) passing the weir on February 6, 2007.
 
Figure 2. Large groups of Sacramento
suckerfish passing through the Vaki during the last storm
event.
Two ad-clipped Chinook
(i.e., indicating presence of coded wire tag) passed
upstream of the weir during this sample period. We
have observed a total of 61 (2.0%) ad-clipped Chinook pass the weir this
season.
One female O.
mykiss (FL:
420mm) carcass was found on top of the weir on February 3 (Figure
3). Our
net upstream season total for live
O. mykiss past
the weir remains at 8 fish for the season.
Figure 3.
A female O. mykiss
carcass that was recovered at the Stanislaus River Weir on
February 3, 2007
(FL: 420mm).
Environmental conditions
remained fairly constant at the weir site during the sample
period. Flow at Orange Blossom Bridge (OBB) ranged from
631 cfs to 792 cfs, and
flow at Ripon (RIP) ranged from
803 cfs to 996 cfs.
Releases from Goodwin Dam (GDW) were decreased from 1,000
cfs to 800 cfs during this sample period. Turbidity ranged between
0.38 NTU and 2.86 NTU;
and dissolved oxygen (DO) ranged between 9.55 mg/L and
13.18
mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin
River's Deep Water Ship Channel ranged from 9.70 mg/L to
18.07 mg/L. Daily instantaneous water temperature at the
Stanislaus River Weir ranged from 48.4ºF to
51.9ºF.
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