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Volume 2014/15, Issue 1
| September 9, 2014 |
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Stanislaus Scrub River Cleanup
September 20
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Key Highlights
July 28, 2014 - August 31, 2014
Stanislaus River Weir Monitoring began immediately after installation on September 4.
Tuolumne River Weir Monitoring is tentatively scheduled to resume in early October.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 252 cfs to 370 cfs. Daily average water temperature in the San Joaquin River ranged from 75.1�F to 80.2�F at Vernalis, and from 76.5�F to 82.9�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 8.6 mg/L to 11.0 mg/L at Mossdale, and from 6.5 mg/L to 7.8 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island).
Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 1,137 cfs to 4,027 cfs.
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2014 Stanislaus River Weir Monitoring
Adult migration monitoring conducted by the Oakdale Irrigation District, South San Joaquin Irrigation District, and Tri-Dam Project began immediately after installation of  the Stanislaus River Weir (RM 24) on September 4. Monitoring is expected to continue through the fall-run Chinook salmon migration season. A total of 5,448 Chinook salmon were counted during the 2013/14 monitoring season and the Pacific Fishery Management Council (PFMC) is predicting the abundance of Sacramento River Fall-run Chinook to be 634,650 in 2014/15, which is down 26 percent from last year's abundance of 862,500 (Table 1).
During the reporting period daily average water temperature at Ripon (RPN; RM 15) ranged between 72.3˚F and 77.7˚F, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 7.63 mg/L to 8.37 mg/L.
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) decreased from 329 cfs to 151 cfs. Flows at Ripon (RIP; RM 15) decreased from 353 cfs to 188 cfs (Figure 1). Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors.
Table 1. Annual fall-run Chinook passage at the Stanislaus River weir, 2003-2013.
Figure 1. Daily average flows (cfs) recorded in the Stanislaus River at Goodwin (GDW) and Ripon (RIP), 2014.
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2014 Tuolumne River Weir Monitoring
Adult migration monitoring at the Tuolumne River Weir (RM 24) conducted by the Modesto Irrigation District and Turlock Irrigation District is tentatively scheduled to resume in early October. A total of 3,739 Chinook salmon were counted during the 2013/14 monitoring season and the PFMC is predicting lower returns to the Central Valley in 2014/15 (Table 2).
Table 2. Annual Fall-run Chinook salmon passage, 2009 - 2013.
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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis ranged from 252 cfs to 370 cfs (Figure 2). Water temperature in the San Joaquin River ranged from 75.1�F to 80.2�F at Vernalis, from 76.5�F to 81.6�F at Mossdale, and from 78.1�F to 80.8�F at Rough 'n Ready Island (Figure 3). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 6.5 mg/L to 7.8 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 8.6 mg/L to 11.0 mg/L at Mossdale (Figure 4).
Figure 2. San Joaquin River flows at Vernalis between August 1, 2013, and August 31, 2014.
Figure 3. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready between August 1, 2013, and August 31, 2014.
Figure 4. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready between August 1, 2013, and August 31, 2014.
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Delta Exports
Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 3 cfs to 935 cfs (Figure 5). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 472 cfs to 3,364 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,137 cfs to 4,027 cfs.
Figure 5. Daily exports at the state and federal pumping stations between August 1, 2013, and August 31, 2014.
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Data Disclaimer: The data displayed on the FISHBIO website are courtesy of California Department of Fish & Wildlife (CDFW), U.S. Fish & Wildlife Service (USFWS), Stockton East Water District (SEWD), Tri-dam Project (TDP), Oakdale Irrigation District (OID), South San Joaquin Irrigation District (SSJID), Turlock Irrigation District (TID), Modesto Irrigation District (MID), East Bay Municipal Utility District (EBMUD) and FISHBIO. Data are intended to be current, but are preliminary and are not guaranteed to be accurate. Source data are compiled and provided by FISHBIO, from whom further information can be obtained. Use or reproduction of this data is prohibited without prior permission.
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