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Volume 2012/13, Issue 12
| April 9, 2013 |
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International Congress for Conservation Biology
July 21-25
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Key Highlights
March 18, 2013 - March 31, 2013
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 44 O. mykiss were captured, increasing the season total to 172.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 1,702 Chinook salmon were captured, increasing the season total to 134,205. Monitoring at Caswell Memorial State Park (RM 9) continued between March 4 and March 31 and a total of 1,966 Chinook salmon were captured, increasing the season total to 15,561.
Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30) and a total of 92 Chinook salmon were captured, increasing the season total to 2,587. Monitoring continued at Grayson (RM 5) and one Chinook salmon was captured, increasing the season total to 3.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 44 Chinook salmon were captured, increasing the season total to 51,324. Monitoring continued at Golf (RM 38) and a total of 6 Chinook salmon were captured, increasing the season total to 2,113.
Stanislaus River Weir Monitoring continued and no Chinook salmon passed upstream through the weir between March 18 and March 31. Season total remains at 7,068.
Tuolumne River Weir Monitoring continued with a total of 8 Chinook salmon passing upstream through the weir between March 18 and March 31, increasing the total to 2,232.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 1,159 cfs to 1,542 cfs. Daily average water temperature in the San Joaquin River ranged from 58.0�F to 67.4�F at Vernalis, and from 59.1�F to 68.1�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.5 mg/L to 11.2 mg/L at Mossdale, and from 8.5 mg/L to 9.6 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 4,511 cfs to 6,262 cfs.
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2011/12 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) operated twelve days between March 18 and March 31 and a total of 44 O. mykiss were captured, increasing the total to 172. Daily catches ranged from one to eleven individuals (Figure 1), and of the O. mykiss captured 33 were YOY (<100 mm) and rated as fry and 11 were Age 1+ (100-299 mm) and were rated as parr (n=6) and silvery parr (n=4). Average forklengths and weights of O. mykiss are provided in Table 1. Two Chinook salmon fry were captured during this reporting period, increasing the season total to two fry and two yearlings. Instantaneous temperature recorded at the trap ranged from 50.1�F to 60.4�F, and turbidity ranged from 0.22 NTU to 2.47 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 34 cfs and 219 cfs, and at Bellota (MRS) flow fluctuated between 5 cfs and 86 cfs (Figure 1). Table 1. Biosampling data for O. mykiss captured at Shelton Road between March 18 and March 31, 2013. Parenthesis indicates range.  
Figure 1. Daily O. mykiss catch at Shelton Road, and Calaveras River flow recorded by New Hogan Dam (NHG) and Cosgrove Creek (COS) combined and flow recorded at Bellota (MRS), in 2012 and 2013.
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2011/12 Stanislaus River Juvenile Migration Monitoring
 Stanislaus River rotary screw trap monitoring at Oakdale (RM 40) continued during the reporting period and a total of 1,702 Chinook salmon were captured, increasing the season total to 134,205. Most of the Chinook salmon measured were parr (n=561), but fry (n=180) and smolt (n=103) were also observed (Table 2).
Three O. mykiss were captured during the reporting period, increasing the season total to 24.
Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between March 18 and March 31, 2013. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 49.6�F to 61.7�F, and turbidity ranged from 0.88 NTU to 6.46 NTU. Daily average flow at Goodwin Dam (GDW) ranged from 202 cfs to 317 cfs, and flow ranged from 347 cfs to 488 cfs at Ripon (RIP) (Figure 2).
One trap efficiency evaluation was conducted during the reporting period with naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Preliminary estimate of capture efficiency is provided in Table 3.
Table 3. Trap efficiency tests conducted at Oakdale between March 18 and March 31, 2013.
 Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2013. The Stanislaus River rotary screw traps at Caswell Memorial State Park (RM 9) sampled continuously between March 4 and March 31, and a total of 1,966 juvenile Chinook salmon were captured during the reporting period including 259 fry, 1,546 parr and 114 smolts fry bringing the season total to 13,529 fry, 1,912 parr, 116 smolts and 4 yearling smolts. No O. mykiss were captured. Season total remains at two. Instantaneous temperature taken at the trap ranged from 52.2�F to 64.6�F, and instantaneous turbidity ranged from 1.46 NTU to 4.18 NTU. Instantaneous dissolved oxygen measured at the trap ranged from 9.28 mg/L to 12.82 mg/L.
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2012 Tuolumne River Juvenile Migration Monitoring
 Tuolumne River rotary screw trap monitoring at Waterford (RM 30) continued during the reporting period and a total of 92 Chinook salmon were captured, increasing the season total to 2,587. Most of the measured fish were smolt (n=50) but parr (n=35) were also observed (Table 4).
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between March 18 and March 31, 2013. Parentheses indicate range.
Instantaneous temperature taken at the trap ranged from 52.7�F to 66.3�F, and turbidity ranged from 0.56 NTU to 3.42 NTU. Daily average flow at La Grange (LGN) was stable between 166 cfs and 172 cfs (Figure 3).
No trap efficiency evaluations were conducted during the reporting period.
Figure 3. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded at La Grange (LGN) between January 1 and March 31, 2013.
 Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and one Chinook salmon (85 mm) was captured, increasing the season total to three.
Instantaneous temperature taken at the trap ranged from 58.1�F to 67.2�F, and turbidity ranged from 3.61 NTU to 14.87 NTU. Daily average flow at Modesto (MOD) ranged between 243 cfs and 334 cfs (Figure 4).
No trap efficiency evaluations were conducted during the reporting period.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and March 31, 2013.
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2011/12 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) continued sampling intermittently during the reporting period. A total of 44 juvenile Chinook salmon were captured, increasing the season total to 51,324.
Average daily flow from Camanche Reservoir (CMN) ranged from 255 cfs to 307 cfs (Figure 5). Instantaneous temperature ranged between 49.5�F and 52.3�F, and instantaneous turbidity ranged between 1.34 NTU and 1.75 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and March 31, 2013.
The Mokelumne River rotary screw trap at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 6 juvenile Chinook salmon were captured, increasing the season total to 2,113.
Average daily flow from Woodbridge Dam (WBR) ranged from 86 cfs to 138 cfs (Figure 6). Instantaneous temperature ranged between 55.6�F and 60.4�F, and instantaneous turbidity ranged between 1.78 NTU and 2.85 NTU.
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and March 31, 2013.
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2011 Stanislaus River Weir Adult Migration Monitoring
Between March 18 and March 31, no Chinook salmon were detected by the Vaki Riverwatcher at the Stanislaus River weir.The total passage to-date of 7,068 is the highest observed at the Stanislaus weir since monitoring began in 2003 (Figure 7; Table 6).
Three O. mykiss were detected passing upstream, increasing the season total to 83.
Instantaneous water temperature measured at the weir ranged between 57.9˚F and 64.9˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 57.1˚F and 65.3˚F (Figure 8). Instantaneous turbidity ranged between 0.56 NTU and 5.39 NTU (Figure 9). Instantaneous dissolved oxygen at the weir ranged between 7.95 mg/L and 13.28 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 8.14 mg/L to 9.29 mg/L (Figure 10).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) ranged from 202 cfs to 317 cfs. Flows at Ripon (RIP; RM 15) ranged from 347 cfs to 488 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 March 31, 2003-2013.
  Figure 7. 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), 2012/13. Figure 8. 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 2012/13. Figure 9. Daily upstream Chinook passage at the Stanislaus River weir in relation to instantaneous turbidity recorded at the weir in 2012/13. (Note: Turbidity on December 24 was measured at 106.0 NTU.) Figure 10. 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 2012/13.
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2011 Tuolumne River Weir Adult Migration Monitoring
B etween March 18 and March 31 a total of 8 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Tuolumne River weir. Total passage to-date of 2,232 is less than the 2,850 passages observed in 2011 at the Tuolumne weir (Table 7). Daily passage, ranged between 0 and 2 Chinook salmon (Figure 11).
No O. mykiss were detected during the reporting period. Season total remains at three.
Daily average flow in the Tuolumne River ranged from 166 cfs to 172 cfs at La Grange (LGN; RM 50) and 243 cfs and 334 cfs at Modesto (MOD; RM 17). 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 63.1˚F and 64.5˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 60.1˚F and 67.3˚F (Figure 12). Instantaneous turbidity ranged between 1.17 NTU and 2.94 NTU (Figure 13), and instantaneous dissolved oxygen ranged between 10.01 mg/L and 10.98 mg/L (Figure 14).
Table 7. Annual Fall-run Chinook passage prior to March 31, 2009 - 2013.
Figure 11. 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 12. 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 13. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir in 2012/13.
Figure 14. 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 ranged from 1,159 cfs to 1,542 cfs (Figure 16). Water temperature in the San Joaquin River ranged from 58.0�F to 67.4�F at Vernalis, from 59.1�F to 68.1�F at Mossdale, and from 60.4�F to 63.4�F at Rough 'n Ready Island (Figure 17). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 8.5 mg/L to 9.6 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.5 mg/L to 11.2 mg/L at Mossdale (Figure 18).
Figure 16. San Joaquin River flow at Vernalis from March 1, 2012, through March 31, 2013.
Figure 17. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from March 1, 2012, through March 31, 2013.
Figure 18. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from March 1, 2012, through March 31, 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 1,560 cfs to 3,446 cfs (Figure 19). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 1,996 cfs to 3,460 cfs. Combined total exports (state and federal pumps) during this period ranged from 4,511 cfs to 6,262 cfs.
Figure 19. Daily exports at the state and federal pumping stations from March 1, 2012, through March 31, 2013.
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