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Volume 2012/13, Issue 18
| July 31, 2013 |
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16th Annual Coho
Confab
August 9-11
AFS Annual Meeting
September 8-12
Stanislaus River Salmon Festival
October 26
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Key Highlights
June 24, 2013 - July 21, 2013 Juvenile Outmigration Monitoring concluded for the season at all sites in the San Joaquin Basin between late May and mid-July.
Table 1. Total salmonid catch by site during the 2012/13 San Joaquin Basin juvenile migration monitoring period.Stanislaus River Weir Monitoring continued with a total of 6 Chinook salmon passing upstream through the weir between June 24 and July 21, increasing the season total to 7,248. San Joaquin River Conditions. San Joaquin River flow at Vernalis fluctuated from 495 cfs to 752 cfs. Water temperature in the San Joaquin River ranged from 71.2�F to 82.9�F at Vernalis, and from 72.6�F to 85.4�F at Mossdale. Average daily dissolved oxygen (DO) in the San Joaquin River ranged from 8.7 mg/L to 17.8 mg/L at Mossdale, and from 6.3 mg/L to 8.2 mg/L at Rough 'n Ready. Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period, ranging from 1,646 cfs to 10,087 cfs.
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2012/13 Calaveras River Juvenile Migration Monitoring
 Monitoring at Shelton Road (RM 28) ended for the season on July 12. During the 2012/13 juvenile outmigration season, the trap was operated 150 days between November 5 and July 12. A total of 336 O. mykiss were captured during the season (Table 2). Most of the O. mykiss captured (n=175) were YOY (<100 mm), but Age 1+ (100-299 mm) were also captured (n=159). A total of 449 juvenile Chinook were captured at Shelton Rd. during the monitoring season. The majority of the Chinook captured (n=429) were smolt (>
70 mm), but 3 fry (<50 mm) and 14 parr (50-69 mm) were also observed. Daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated during the reporting period and ranged from 159 cfs to 243 cfs, and at Bellota (MRS) flow fluctuated between 36 cfs and 56 cfs (Figure 1). Table 2. Biosampling data for O. mykiss and Chinook captured at Shelton Road between November 5, 2012 and July 12, 2013. Parentheses indicate range. 
Figure 1. Daily O. mykiss catch at Shelton Road (red), Calaveras River flow recorded nearby New Hogan Dam (NHG) and Cosgrove Creek (COS) combined (blue) and flow recorded at Bellota (MRS; green), in 2012 and 2013.
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2013 Stanislaus River Juvenile Migration Monitoring
Monitoring on the Stanislaus River at Oakdale (RM 40) ended for the season on June 28. During the 2013 juvenile outmigration season, the trap was operated 162 days between January 2 and June 28. A total of 149,546 Chinook salmon were captured during the season (Figure 2). Most of the Chinook salmon measured (n=4,970) were fry (<50 mm), but 1,905 parr (50-69 mm) and 2,055 smolt (>70 mm) were also captured (Table 3).
A total of 47 O. mykiss were captured during the 2013 monitoring season.
Daily average flow at Goodwin Dam (GDW) fluctuated during the reporting period between 250 cfs and 361 cfs, and flow at Ripon (RIP) ranged from 300 cfs to 504 cfs.
Table 3. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between January 2 and June 28, 2013.
 Figure 2. Daily Chinook salmon catch at Oakdale (green) and Stanislaus River flow recorded at Goodwin Dam (GDW; blue) and Ripon (RIP; orange) in 2013. Final data are not yet available for monitoring at Caswell Memorial State Park (RM 9).
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2013 Tuolumne River Juvenile Migration Monitoring
 Rotary screw trap monitoring at Waterford (RM 30) ended for the season on May 31. During the 2013 juvenile outmigration season, the trap was operated 149 days between January 2 and May 31. A total of 3,103 Chinook salmon were captured during the season. Most of the Chinook salmon measured (n=1,730) were fry (<50 mm), but 300 parr (50-69 mm) and 434 smolt (>70 mm) were also captured (Table 4).
No O. mykiss were captured during the 2013 monitoring season.
Daily average flow at La Grange (LGN) fluctuated from 95 cfs to 116 cfs during the reporting period (Figure 3).
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford (RM 30) between January 2 and May 31, 2013. Parentheses indicate range.
 Figure 3. Daily Chinook salmon catch at Waterford (RM 30) and daily average Tuolumne River flows at La Grange (LGN) between January 1 and July 21, 2013. Rotary screw trap monitoring at Grayson (RM 5) ended for the season on May 23. During the 2013 juvenile outmigration season, the trap was operated 141 days between January 3 and May 23. A total of 35 Chinook salmon were captured during the season. Most of the Chinook salmon measured (n=32) were smolt (>70 mm), but one fry (<50 mm) and one parr (50-69 mm) were also captured (Table 5). No O. mykiss were captured during the 2013 monitoring season. Daily average flow at Modesto (MOD) fluctuated during the reporting period and ranged from 143 cfs to 201 cfs (Figure 4). Table 5. Biosampling data for Chinook salmon captured and measured at Grayson between January 3 and May 23, 2013. Parentheses indicate range. 
Figure 4. Daily Chinook salmon catch at Grayson (RM 5) and daily average Tuolumne River flows at Modesto (MOD) between January 3 and July 21, 2013.
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2012/13 Mokelumne River Juvenile Migration Monitoring
T he Mokelumne River rotary screw trap monitoring at Vino (RM 54) ended on June 20. A total of 58,727 juvenile Chinook salmon were captured during the 2013 monitoring season (Figure 5). Monitoring at Golf (RM 38) ended on May 24 and a total of 2,529 juvenile Chinook salmon were captured during the 2013 monitoring season (Figure 6). Monitoring in the smolt by-pass trap (RM 38) ended on July 2. A total of 35,683 juvenile Chinook salmon were captured during the 2013 monitoring season (Figure 7). Daily average flow at Camanche Reservoir (CMN) ranged from 285 cfs to 338 cfs during the reporting period, and flow at Woodbridge Dam (WBR) ranged from 29 cfs to 42 cfs.
Figure 5. Daily juvenile Chinook catch at Vino Farms (RM 54) and daily average Mokelumne River flows at Camanche Reservoir (CMN) between December 1, 2012, and July 21, 2013.
Figure 6. Daily juvenile Chinook catch at Golf (RM 38) and daily average Mokelumne River flows at Woodbridge Dam (WBR) between December 15, 2012, and July 21, 2013.Figure 7. Daily juvenile Chinook catch at the by-pass (RM 38) and daily average Mokelumne River flows at Woodbridge Dam (WBR) between April 1 and July 21, 2013.
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2012/13 Stanislaus River Weir Adult Migration Monitoring
Between June 24 and July 21 a total of 6 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Stanislaus River weir, increasing the total Chinook salmon passage since September 11, 2012 to 7,248 (Figure 8; Table 6).
No O. mykiss were detected passing upstream. The season total remains at 100.
Instantaneous water temperature measured at the weir ranged between 64.9˚F and 71.4˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 69.3˚F and 77.9˚F (Figure 9). Instantaneous turbidity ranged between 0.48 NTU and 2.07 NTU (Figure 10). Instantaneous dissolved oxygen at the weir ranged between 8.26 mg/L and 10.08 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 7.51 mg/L to 8.56 mg/L (Figure 11).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) ranged from 250 cfs to 361 cfs. Flows at Ripon (RIP; RM 15) ranged from 300 cfs to 504 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors.
Table 6. Annual fall-run Chinook passage at the Stanislaus River weir prior to July 21, 2003-2013.
Figure 8. 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 9. 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 10. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 11. 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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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis fluctuated from 495 cfs to 752 cfs (Figure 12). Water temperature in the San Joaquin River ranged from 71.2�F to 82.9�F at Vernalis, from 72.6�F to 85.4�F at Mossdale, and from 73.9�F to 81.1�F at Rough 'n Ready Island (Figure 13). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 6.3 mg/L to 8.2 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and fluctuated from 8.7 mg/L to 17.8 mg/L at Mossdale (Figure 14).
Figure 12. San Joaquin River flow at Vernalis from July 1, 2012, to July 21, 2013.
Figure 13. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from July 1, 2012, to July 21, 2013.
Figure 14. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from July 1, 2012, to July 21, 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 801 cfs to 4,125 cfs (Figure 15). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 834 cfs to 6,960 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,646 cfs to 10,087 cfs.
Figure 15. Daily exports at the state and federal pumping stations from July 1, 2012, to July 21, 2013.
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