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 January
15 through January 28, 2007
A total of 8 Chinook passed
upstream of the weir between January 15 and January 28
increasing the season total to 3,056. Chinook daily passage
counts ranged from 0 to 2 fish. Total-lengths ranged from
601 mm to 991 mm (avg = 836 mm). Other fish species observed
included Sacramento blackfish, Sacramento suckerfish,
Sacramento pikeminnow, and one
O. mykiss.
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 59 (1.9%) ad-clipped Chinook pass the weir this
season.
During the sample period we
recovered one spawned out Chinook carcass that washed up
onto the weir (male; FL: 730mm). The carcass was processed
and then passed downstream of the weir. The carcass
processed was not ad-clipped.
One live
O. mykiss (TL:
483mm) passed the weir during this sample period as well as
two O. mykiss
carcasses were recovered on top of the weir (Figure 1). Our
net upstream season total for live
O. mykiss past
the weir this season is currently at 8 fish.
 
Figure 1.
Two O. mykiss
carcasses that were recovered at the Stanislaus River Weir
(FL: 390mm and FL: 620mm; both female).
Environmental conditions
remained fairly constant at the weir site during the sample
period. Flow at Orange Blossom Bridge (OBB) ranged from 797
cfs to 945 cfs, and flow at Ripon (RIP) ranged from 1,010
cfs to 1,153 cfs. Flow releases from Goodwin Dam dropped
from 1,200 cfs to 1,000 cfs during this sample period
(Figure 2). Turbidity ranged between 0.42 NTU and 1.43 NTU;
and dissolved oxygen (DO) ranged between 9.09 mg/L and 10.98
mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin
River's Deep Water Ship Channel ranged from 11.17 mg/L to
12.58 mg/L. Daily instantaneous water temperature at the
Stanislaus River weir ranged from 45.7ºF to 48.4ºF.
Figure 2.
Current
conditions at the Stanislaus River Weir.
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