Volume 2010/11, Issue 1
| September 3, 2010 |
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Teaming Up For The Tuolumne:
Sept. 11
Delta Science Conference:
Sept. 27-29
Stanislaus River Salmon Festival:
Nov. 14
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Photo by FISHBIO.
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Key Highlights
2010
Stanislaus River Weir Monitoring for fall-run Chinook salmon is scheduled
to begin the week of September 6.
2010
Tuolumne River Weir Monitoring for fall-run Chinook salmon is scheduled
to begin the week of September 13.
San Joaquin River
Conditions. San Joaquin River flow at Vernalis
was relatively stable, ranging between 1,025 cfs and 1,369 cfs. Water
temperatures in the San Joaquin River ranged between 71.1�F and 80.0�F. Average daily dissolved
oxygen (DO) in the San Joaquin River fluctuated between 9.1 mg/L and 13.3 mg/L at
Mossdale, and fluctuated between 4.8 mg/L and 6.7 mg/L at Rough 'n Ready.
Delta Exports. Combined
total exports (state and federal pumps) fluctuated during the reporting
period from 9,036 cfs to 11,524 cfs, but decreased to 6,331 cfs on September 1.
We encourage subscribers to contribute any relevant information for future issues of the newsletter (e.g., additional monitoring studies, announcements of upcoming meetings and events, etc). If you would like to contribute, please contact Chrissy Sonke. |
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2010/11 Stanislaus River Weir Monitoring
The
Stanislaus River Weir will be
installed in the same location as past years, approximately two river miles
downstream of Jacob Meyers Park (RM 31.4), near the town of Riverbank. This will
be the eighth consecutive year that fall-run Chinook salmon and steelhead
migration in the Stanislaus River will be monitored using an Alaskan weir and
Vaki Riverwatcher (Vaki) fish counter (Figure 1). Since 2003, annual counts of Chinook salmon at the weir have ranged between 408 (2007) and 4,848 (2003; Figure 2).
Figure 1. Chinook salmon passing upstream of the Stanislaus River Weir, 2009.  | Figure 3. Installation of the Stanislaus River Weir substrate rail.  |
In preparation for 2010 monitoring, the original substrate rail installed during pilot evaluation of the weir in fall 2002 was replaced due to wear (Figure 3). The substrate rail serves as an anchor along the riverbed to hold the floating weir panels in place.
Figure 3. Cummulative passage of fall-run Chinook salmon at the
Stanislaus River Weir during 2003-2009.
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2010/10 Tuolumne River Weir Monitoring
Figure 4. Vaki Riverwatcher video clip of a Chinook salmon passing upstream through the Tuolumne River Weir in 2009. Click on the photo to view the video.  | The
Tuolumne River Weir is scheduled to
be installed during the week of September 13, approximately two river miles
downstream of Fox Grove Fishing Access (RM24) near the town of Hughson.
This is the second year that fall-run Chinook salmon and
steelhead migration will be monitored at this location using an Alaskan weir and Vaki
Riverwatcher (Vaki) fish counter (Figure 4). During 2009, 282 Chinook salmon were
detected passing upstream of the weir (Figure 5).
Figure
5. Cumulative passage of fall-run Chinook salmon at the Tuolumne River Weir during 2009.
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During the reporting period, flows in the San Joaquin
River at Vernalis were relatively stable between 1,025 cfs and 1,369 cfs
(Figure 6). Water temperatures in the San Joaquin River ranged between 71.1�F and 77.9�F at Vernalis; from 72.0�F to 78.9�F at Mossdale; and from 75.5�F to 80.0�F at Rough 'n Ready Island (Figure 7). Average daily dissolved oxygen
(DO) in the San Joaquin River fluctuated from 4.8 mg/L to 6.7 mg/L in the deep
water ship channel (measured at Rough 'n Ready Island) and between 9.1 mg/L and
13.3 mg/L at Mossdale (Figure 8).
Figure
6. San Joaquin River flow at Vernalis between August 1, 2009 through September 1,
2010.
Figure
7. San Joaquin River daily average water temperature at Vernalis, Mossdale, and
Rough 'n Ready, between August 1, 2009 through September 1, 2010.
Figure
8. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, between
August 1, 2009 through September 1, 2010.
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping
Plant (federal pumps previously known as Tracy Pumping Plant) was relatively
stable during the reporting period and ranged between 4,048 cfs and 4,297 cfs,
however on September 1 flow decreased to 82 cfs (Figure 9). Mean daily pumping
at the Harvey O. Banks Pumping Plant (state pumps) ranged between 4,884 cfs and
7,347 cfs during the reporting period. Combined total exports (state and
federal pumps) ranged from 6,331 cfs to 11,524
cfs during the reporting.
Figure
9. Daily exports at the Federal and State pumping stations between August 1,
2009 through September 1, 2010.
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