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Volume 2013/14, Issue 1
| September 10, 2013 |
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Oroville Salmon Festival
September 27-29
Stanislaus River Salmon Festival
October 26
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Key Highlights
July 22, 2013 - September 1, 2013 Stanislaus River Weir Monitoring continued during the reporting period and no salmonids were detected by the VAKI Riverwatcher. Tuolumne River Weir Monitoring is tentatively scheduled to resume during the week of September 23, 2013. Mokelumne River Woodbridge Dam Fish Ladder Monitoring began on August 1, 2013. No Chinook salmon passed upstream of the dam between August 1 and September 1. San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 465 cfs to 618 cfs. Daily average water temperature in the San Joaquin River ranged from 74.3�F to 80.0�F at Vernalis, and from 69.0�F to 81.1�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.7 mg/L to 16.4 mg/L at Mossdale, and from 6.4 mg/L to 7.6 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 7,453 cfs to 11,620 cfs.
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2013 Stanislaus River Weir Adult Migration Monitoring
Between July 22 and September 1, no Chinook salmon were detected by the VAKI Riverwatcher. A total of 7,248 Chinook salmon were counted in the 2012/13  monitoring season and the Pacific Fishery Management Council (PFMC) is predicting similar returns the Central Valley in 2013/14 (Table 1).
No O. mykiss were detected passing upstream during the reporting period. A total of 100 O. mykiss were counted passing upstream during the 2012/13 monitoring season.
Instantaneous water temperature measured at the weir ranged between 65.5˚F and 71.8˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 69.0˚F and 81.1˚F (Figure 2). Instantaneous turbidity ranged between 0.60 NTU and 4.02 NTU (Figure 3). Instantaneous dissolved oxygen at the weir ranged between 6.11 mg/L and 10.87 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 7.45 mg/L to 8.19 mg/L (Figure 4).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) ranged from 201 cfs to 258 cfs. Flows at Ripon (RIP; RM 15) ranged from 234 cfs to 310 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 upstream Chinook passage at the Tuolumne River Weir in relation to daily average flows (cfs) recorded in the Tuolumne River at La Grange (LGN) and Modesto (MOD), and in the San Joaquin River at Vernalis (VNS) in 2012/13.
Figure 2. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous water temperature recorded at the weir, and daily average water temperature recorded in the Tuolumne River at Modesto (MOD) and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
Figure 3. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 4. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous dissolved oxygen recorded at the weir, and daily average dissolved oxygen recorded in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI) in 2012/13.
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2013 Tuolumne River Weir Adult Migration Monitoring
Monitoring at the Tuolumne River Weir (RM 24), downstream of Fox Grove Fishing Access, is tentatively scheduled to resume during the week of September 23. A total of 2,305 Chinook salmon were counted in the 2012/13 monitoring season and the PFMC is predicting similar returns to the Central Valley in 2013/14 (Table 2).
Table 2. Annual Fall-run Chinook salmon passage, 2009 - 2012.
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2013 Mokelumne River Fish Ladder Monitoring
Fall-run Chinook salmon returning to the Mokelumne are counted annually by East Bay Municipal Utility District (EBMUD) as they ascend the fish ladder at Woodbridge Dam. Video monitoring began on August 1 and continued through September 1. No Chinook salmon were observed passing upstream of the dam (Figure 8). During the reporting period, daily average flow in the Mokelumne River fluctuated between 239 and 292 cfs at Camanche Reservoir (CMN).
Figure 5. Daily upstream Chinook passage recorded at the Woodbridge Dam fish ladder in relation to daily average flows (cfs) recorded in the Mokelumne River at Camanche Reservoir (CMN) in 2013.
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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis fluctuated between 465 cfs and 618 cfs (Figure 6). Water temperature in the San Joaquin River ranged from 74.3�F to 80.0�F at Vernalis, from 69.0�F to 81.1�F at Mossdale, and from 76.7�F to 79.6�F at Rough 'n Ready Island (Figure 7). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 6.4 mg/L to 7.6 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.7 mg/L to 16.4 mg/L at Mossdale (Figure 8).
Figure 6. San Joaquin River flow at Vernalis from September 1, 2012, and September 1, 2013.
Figure 7. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from September 1, 2012, and September 1, 2013.
Figure 8. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from September 1, 2012, and September 1, 2013.
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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 3,272 cfs to 4,209 cfs (Figure 9). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 3,959 cfs to 7,454 cfs. Combined total exports (state and federal pumps) during this period ranged from 7,453 cfs to 11,620 cfs.
Figure 9. Daily exports at the state and federal pumping stations from September 1, 2012, and September 1, 2013.
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Data Disclaimer: The data displayed on the FISHBIO website are courtesy of California Department of Fish & Game (CDFG), U.S. Fish & Wildlife Service (USFWS), Tri-dam, 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 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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