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 December
18 through December 31, 2006
A total of 69 Chinook passed
upstream of the weir between December 18 and December 31
increasing the season total to 3,022 (Figure 1). Chinook
daily passage counts ranged from 1 to 8 fish. Total-lengths
ranged from 424 mm to 1,063 mm (avg = 794 mm). Other fish
species observed included multiple Sacramento sucker, and
one Sacramento pikeminnow.
Figure 1.
Adult Chinook Passage at the Stanislaus River weir, 2003 to
2006.
No ad-clipped Chinook (i.e.,
indicating presence of coded wire tag) passed upstream of
the weir during this sample period.
We recovered five spawned out
Chinook carcass during this sample period along with one
O. mykiss
carcass and one bluegill carcass (Figure 2). All carcasses
were processed and then passed downstream of the weir
except the
O. mykiss
carcass which was taken back to our office and then handed
over to CDFG (Figure 3).
Figure 2.
Chinook carcass (TL: 915mm) recovered from the weir on
December 27, 2006.
Figure 3.
O. mykiss
carcass (TL: 440mm) recovered from the weir on December 24,
2006.
One live
O. mykiss passed
the weir on December 27. The fish had a TL: 504mm and a
depth of 120mm.
Environmental conditions
remained fairly constant at the weir site during the sample
period. Flow at Orange Blossom Bridge (OBB) ranged from 915
cfs to 961 cfs, and flow at Ripon (RIP) ranged from 1,096
cfs to 1,169 cfs. The weir is operating well under the
current high flow conditions with the effort of one cleaning
per day. Turbidity ranged between 0.72 NTU and 2.5 NTU; and
dissolved oxygen (DO) ranged between 9.88 mg/L and 10.59
mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin
River's Deep Water Ship Channel ranged from 8.20 mg/L to
10.30 mg/L. Daily instantaneous water temperature at the
Stanislaus River weir ranged from 47.3ºF to 50.4ºF.
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