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Volume 2013/14, Issue 3
| October 22, 2013 |
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Stanislaus River Salmon FestivalOctober 26
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Key Highlights
September 30, 2013 - October 13, 2013
Stanislaus River Weir Monitoring continued and 800 Chinook salmon have passed upstream through the weir this year.
Tuolumne River Weir Monitoring continued and 66 Chinook salmon have passed upstream through the weir this year.
Mokelumne River Woodbridge Dam Fish Ladder Monitoring continued and 582 Chinook salmon passed upstream of the dam this year.
San Joaquin River Conditions. San Joaquin River flow at Vernalis decreased from 1,211 cfs to 910 cfs. Daily average water temperature in the San Joaquin River ranged from 62.4�F to 68.1�F at Vernalis, and from 63.5�F to 68.5�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 8.3 mg/L to 9.8 mg/L at Mossdale, and from 7.6 mg/L to 8.2 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 3,577 cfs to 5,217 cfs.
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2013 Stanislaus River Weir Adult Migration Monitoring
A total of 427 Chinook salmon were detected passing upstream of the Stanislaus River Weir (RM 31) between September 30 and October 13, increasing the season  total to 800 (Figure 1). Daily passage ranged between 1 and 66 Chinook salmon. During the 2012/13 monitoring season, a total of 7,248 Chinook salmon were counted (Table 1) and the Pacific Fishery Management Council (PFMC) is predicting similarly high returns the Central Valley in 2013/14.
One O. mykiss was detected passing upstream during the reporting period, increasing the season total to two.
Instantaneous water temperature measured at the weir ranged between 57.9˚F and 63.8˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 61.3˚F and 66.1˚F (Figure 3). Instantaneous turbidity ranged between 0.76 NTU and 2.39 NTU (Figure 4). Instantaneous dissolved oxygen at the weir ranged between 8.69 mg/L and 11.27 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 8.62 mg/L to 9.27 mg/L (Figure 5).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) increased from 202 cfs to 465 cfs. Flows at Ripon (RIP; RM 15) ranged from 251 cfs to 277 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. Cumulative passage of fall-run Chinook salmon recorded at the Stanislaus River weir from 2003-2013.
Figure 2. Daily upstream Chinook passage at the Stanislaus River weir in relation to daily average flows (cfs) recorded in the Stanislaus River at Goodwin (GDW) and Ripon (RIP), 2013.
Figure 3. Daily upstream Chinook passage recorded at the Stanislaus River weir in relation to instantaneous water temperature recorded at the weir, and daily average water temperature recorded in the Stanislaus River at Ripon (RPN), and in the San Joaquin River at Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI) in 2013.
Figure 4. Daily upstream Chinook passage at the Stanislaus River weir in relation to instantaneous turbidity recorded at the weir in 2013.
Figure 5. Daily upstream Chinook passage at the Stanislaus River weir in relation to instantaneous dissolved oxygen recorded at the weir, and daily average dissolved oxygen recorded in the Stanislaus River at Ripon (RPN), and in the San Joaquin River at Mossdale (MSD) and Rough & Ready (RRI) in 2013.
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2013 Tuolumne River Weir Adult Migration Monitoring
A total of 40 Chinook salmon were detected passing upstream of the Tuolumne River Weir (RM 24) between September 30 and October 13, increasing the season  total to 66 (Figure 1). Daily passage ranged between 0 and 8 Chinook salmon (Figure 6).
No O. mykiss have been detected at the Tuolumne River weir this season.
Daily average flow in the Tuolumne River ranged from 95 cfs to 172 cfs at La Grange (LGN; RM 50) and 134 cfs and 220 cfs at Modesto (MOD; RM 17) (Figure 7). Note: flows downstream of La Grange may be higher than dam releases due to accretion and Dry Creek inflow.
Instantaneous water temperature measured at the weir ranged between 62.6˚F and 70.8˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 63.3˚F and 69.8˚F (Figure 8). Instantaneous turbidity ranged between 0.87 NTU and 2.58 NTU (Figure 9), and instantaneous dissolved oxygen ranged between 8.83 mg/L and 11.44 mg/L (Figure 10).
Table 2. Annual Fall-run Chinook salmon passage, 2009 - 2013.
Figure 6. Fall-Run Chinook salmon cumulative passage recorded at the Tuolumne River Weir in 2009 - 2013.
Figure 7. 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 2013.
Figure 8. 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 2013.
Figure 9. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2013.
Figure 10. 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 2013.
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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 continued during the reporting period and 578 Chinook salmon were observed passing upstream of the dam between September 30 and October 13, increasing the season total to 582 (Figure 11). Daily passages ranged between 0 and 189 Chinook salmon. During the reporting period, daily average flow in the Mokelumne River fluctuated between 265 cfs and 470 cfs at Camanche Reservoir (CMN).
Figure 11. 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 decreased from 1,211 cfs to 910 cfs (Figure 12). Water temperature in the San Joaquin River ranged from 62.4�F to 68.1�F at Vernalis, from 63.5�F to 68.5�F at Mossdale, and from 65.6�F to 69.3�F at Rough 'n Ready Island (Figure 13). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 7.6 mg/L to 8.2 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 8.3 mg/L to 9.8 mg/L at Mossdale (Figure 14).
Figure 12. San Joaquin River flow at Vernalis from October 1, 2012, and October 13, 2013.
Figure 13. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from October 1, 2012, and October 13, 2013.
Figure 14. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from October 1, 2012, and October 13, 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 2,585 cfs to 3,308 cfs (Figure 15). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 950 cfs to 2,103 cfs. Combined total exports (state and federal pumps) during this period ranged from 3,577 cfs to 5,217 cfs.
Figure 15. Daily exports at the state and federal pumping stations from October 1, 2012, and October 13, 2013.
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