| Volume 2012, Issue 14 | April 10, 2012 |
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Pick and Gather at Riverdance Farms and Merced River Fair:
June 2-3
National Conference on Engineering & Ecohydrology for Fish Passage:
June 5-7
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Key Highlights
March 19, 2012 - April 1, 2012
Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) during the reporting period. A total of 227 O. mykiss were captured, increasing the season total to 379. A total of 40 Chinook salmon fry were also captured, bringing the season total to 214.
Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) during the reporting period. A total of 4,867 Chinook salmon were captured, increasing the season total to 16,081. One O. mykiss was captured, increasing the season total to 19. Information is not available from monitoring at Caswell State Park (RM 8).
Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30) during the reporting period. A total of 169 Chinook salmon were captured, increasing the season total to 2,852. Monitoring at Grayson (RM 5) continued during the reporting period. Four Chinook salmon were captured, increasing the season total to 13. No O. mykiss have been captured this season at Waterford or Grayson.
Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) during the reporting period. A total of 460 Chinook salmon were captured, increasing the season total to 12,287. Ten O. mykiss were captured, increasing the season total to 26. Monitoring at the Bypass trap (RM 38) began during the reporting period. No Chinook salmon or O. mykiss were captured. Monitoring at Golf (RM 38) ended on March 16. A total of 873 Chinook salmon and a total of 144 O. mykiss were captured during the season.
Stanislaus River Weir Monitoring continued during the reporting period. One Chinook salmon passed upstream through the weir during the reporting period, increasing the season total to 818. Three O. mykiss passed upstream through the weir, increasing the season total to 81.
Tuolumne River Weir Monitoring continued during the reporting period. A total of 7 Chinook salmon passed upstream through the weir, increasing the season total to 2,873. No O. mykiss passed upstream through the weir during the reporting period. Season total remains at 11.
San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 1,520 cfs to 2,106 cfs. Daily average water temperature in the San Joaquin River ranged from 54.7�F to 62.8�F at Vernalis, and from 55.2�F to 63.2�F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.4 mg/L to 11.3 mg/L at Mossdale, and from 7.6 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 1,101 cfs to 6,104 cfs.
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2011/12 Calaveras River Juvenile Migration Monitoring
The Calaveras River rotary screw trap at Shelton Road (RM 28) sampled continously between March 19 and April 1. A total of 227 O. mykiss were captured, increasing the  season total to 379. Daily catch ranged from 2 to 41 individuals (Figure 1). Average forklengths and weights for 226 O. mykiss are provided in Table 1. A majority of the O. mykiss measured were YOY (<100 mm), and were rated as fry (n=182) and parr (n=3), but Age 1+ (100-299 mm) were also observed, and were rated as silvery parr (n=6) and smolt (n=6).
A total of 40 Chinook salmon were captured during the reporting period, increasing the season total to 214.Daily catch ranged between 0 and 10 Chinook salmon (Figure 2). Most of the Chinook salmon measured were parr (n=29) but fry (n=11) also observed (Table 1).
Daily average combined flows from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 49 cfs and 129 cfs, and at Bellota (MRS) flows ranged from 0 cfs to 49 cfs (Figure 3).Instantaneous water temperatures recorded at the trap ranged from 48.0�F to 55.7�F, and turbidity ranged from 0.33 NTU to 3.95 NTU.
Table 1. Biosampling data for salmonids captured at Shelton Road (RM 28) between March 19 and April 1, 2012. Parenthesis indicates range.
Figure 1. Daily O. mykiss catch at Shelton Road between October 15, 2011, and April 1, 2012.
Figure 2. Daily Chinook salmon catch at Shelton Road between October 15, 2011, and April 1, 2012.
Figure 3. Daily Calaveras River flows recorded at New Hogan Dam and Cosgrove Creek combined (NHG + COS) and at Bellota (MRS) and turbidity recorded at the trap between October 15, 2011, and April 1, 2012.
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2011/12 Stanislaus River Juvenile Migration Monitoring
The Stanislaus River rotary screw trap at Oakdale (RM 40) sampled continuously between March 19 and April 1. A total of 4,867 Chinook salmon were captured, increasing the season total to 16,081. Daily catch ranged between 101 and 1,724 Chinook salmon (Figure 4). Most of the Chinook salmon measured were parr (n=612), but fry (n=39) and smolt (n=166) were also observed (Table 2).
One O. mykiss was captured during the reporting period, increasing the season total to 19.
Table 2. Biosampling data for salmonids captured and measured at Oakdale (RM 40) between March 19 and April 1, 2012.
 Four trap efficiency experiments were conducted with naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Preliminary estimates of capture efficiency are provided in Table 3. Table 3. Trap efficiency tests conducted at Oakdale (RM 40) between March 19 and April 1, 2012.
Daily average flows at Goodwin Dam (GDW) ranged from 301 cfs to 402 cfs, and at Ripon (RIP) ranged from 344 cfs to 405 cfs. Instantaneous water temperatures taken at the trap ranged from 48.5�F to 59.4�F, and turbidity ranged from 0.81 NTU to 5.09 NTU.
Figure 4. Daily Chinook salmon catch at Oakdale (RM 40) and daily average Stanislaus River flows at Goodwin Dam (GDW) and Ripon (RIP) between January 1, 2012, and April 1, 2012.
At time of this report information from monitoring at Caswell State Park (RM 8) between March 19 and April 1 is not available.
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2012 Tuolumne River Juvenile Migration Monitoring
The Tuolumne River rotary screw trap at Waterford (RM 30) operated continuously between March 19 and April 1. A total of 169 juvenile Chinook salmon were captured, increasing the season total to 2,852. Daily catch ranged between 3 and 27 Chinook (Figure 5). Average forklengths and weights of all measured Chinook salmon are provided in Table 4. Most of the Chinook salmon captured were smolt (n=84), but fry (n=8) and parr (n=57) were also observed.
No O. mykiss were captured, and the season total remains at zero.
Table 4. Biosampling data for Chinook salmon captured and measured at Waterford (RM 30) between March 19 and April 1, 2012. Parentheses indicate range. No trap efficiency experiments were conducted during the reporting period.
Daily average flows at La Grange (LGN) were relatively stable, between 316 cfs and 321 cfs. Instantaneous water temperatures taken at the trap ranged from 50.0�F to 58.4�F, and turbidity ranged from 0.80 NTU to 4.09 NTU.
 Figure 5. Daily Chinook salmon catch at Waterford (RM 30) and daily average Tuolumne River flows at La Grange (LGN) and Modesto (MOD) between December 1, 2011, and April 1, 2012.  The Tuolumne River rotary screw traps at Grayson (RM 5) operated continuously between March 19 and April 1. Four Chinook salmon were captured, increasing the season total to 13 (Figure 6).
No O. mykiss were captured, and the season total remains at zero. No trap efficiency experiments were conducted. Daily average flow at Modesto (MOD) was stable during the reporting period, ranging between 425 cfs and 582 cfs. Instantaneous water temperatures taken at the trap ranged from 53.6�F to 63.1�F, and turbidity ranged from 1.20 NTU to 16.57 NTU.
Figure 6. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at La Grange (LGN) and Modesto (MOD) between January 1 and April 1, 2012.
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2011/12 Mokelumne River Juvenile Migration Monitoring
The Mokelumne River rotary screw trap at Vino Farms (RM 54) sampled intermittently between March 19 and April 1. A total of 460 juvenile Chinook salmon were captured, bringing the season total to 12,287. Daily catch ranged between 22 and 108 Chinook salmon (Figure 7).
Ten O. mykiss were captured, increasing the season total to 26.
Daily average flows from Camanche Reservoir (CMN) were stable, ranging from 248 cfs to 260 cfs. Instantaneous water temperatures ranged between 49.8�F and 54.7�F, and instantaneous turbidity ranged between 2.46 NTU and 3.30 NTU.  Figure 7. Daily juvenile Chinook catch at Vino Farms (RM 54) and daily averageMokelumne River flows at Camanche Reservoir (CMN) between December 1, 2011, and April 1, 2012. The Mokelumne River Bypass trap (RM 38) began on March 20 and sampled intermittently through April 1. No juvenile Chinook salmon were captured during the reporting period. No O. mykiss were captured during the reporting period. Daily average flows recorded at Woodbridge (WBR) ranged from 155 cfs to 189 cfs (Figure 8). Instantaneous water temperatures ranged between 54.9�F and 55.9�F, and turbidity ranged between 2.77 NTU and 3.41 NTU.
Figure 8. Daily juvenile Chinook catch at Golf (RM 38) and daily averageMokelumne River flows at Woodbridge (WBR), between December 15, 2011, and April 1, 2012. The Mokelumne River rotary screw trap at Golf (RM 38) ended on March 16. A total of 873 juvenile Chinook salmon were captured during the season. Daily catch ranged between 1 and 50 Chinook salmon (Figure 8). A total of 144 O. mykiss were captured during the season and 135 were identified as hatchery origin.
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2011 Stanislaus River Weir Adult Migration Monitoring
The Stanislaus River Weir and Vaki Riverwatcher (RM 31) sampled continuously between March 19 and April 1. One Chinook salmon was detected during the reporting period, increasing the season total to 818.
Three O. mykiss were detected passing upstream of the weir, increasing the season total to 81. The adipose fins of hatchery orgin O. mykiss are clipped before release. One of the O. mykiss observed during the reporting period was positively identified as hatchery origin (ad-clipped), and two were positively identified as naturally spawned origin. The season totals for passage of O. mykiss are now 53 hatchery origin, 14 natural spawned origin, and 14 that could not be determined.
Other fish passing upstream of the weir included 4 black bass and 521 Sacramento suckers (Table 5).
Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) were stable, between 301 cfs and 402 cfs (Figure 9). Flows at Ripon (RIP; RM 15) fluctuated between 344 cfs and 405 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation and other factors. Instantaneous water temperature measured at the weir ranged between 53.7˚F and 60.4˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 53.0˚F and 61.4˚F (Figure 10). Instantaneous turbidity at the weir ranged between 1.08 NTU and 5.77 NTU (Figure 11). Instantaneous dissolved oxygen at the weir ranged between 10.87 mg/L and 12.66 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 8.39 mg/L to 9.70 mg/L (Figure 12).
Table 5. Net passage counts for all species between March 19 and April 1, 2012, at the Stanislaus River weir (RM 31).   Figure 9. 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), September 1, 2011 and April 1, 2012. Figure 10. 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), September 1, 2011 and April 1, 2012.
Figure 11. Daily upstream Chinook passage at the Stanislaus River weir in relation to instantaneous turbidity recorded at the weir, September 1, 2011 and April 1, 2012.
Figure 12. 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), September 1, 2011 and April 1, 2012.
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2011 Tuolumne River Weir Adult Migration Monitoring
The Tuolumne River Weir and Vaki Riverwatcher (RM 22) sampled continuously between March 19 and April 1. A total of seven Chinook salmon were detected as  they passed upstream of the weir, increasing the season total to 2,873. Daily passage ranged between zero and one Chinook salmon.
No O. mykiss were detected passing upstream of the weir during the reporting period. The season total remains at 11.
Other fish passing upstream of the weir included 23 black bass, 33 goldfish, and 335 Sacramento suckers (Table 6).
Daily average flows in the Tuolumne River ranged from 316 cfs to 321 cfs at La Grange (LGN; RM 50) and from 425 cfs to 588 cfs at Modesto (MOD; RM 17). Note: flows downstream of La Grange may be higher than dam releases due to accretion and Dry Creek inflows (Figure 13). Instantaneous water temperatures measured at the weir ranged from 50.4˚F and 60.6˚F and daily average water temperatures at Modesto ranged from 54.0˚F and 60.1˚F (Figure 14). Instantaneous turbidity at the weir ranged between 0.69 NTU and 3.37 NTU (Figure 15), and dissolved oxygen ranged between 10.06 mg/L and 12.89 mg/L (Figure 16).
Table 6. Net passage counts for all species between March 19 and April 1, 2012 at the Tuolumne River (RM 22).
Figure 13. 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 Maze Road Bridge (MRB) and Vernalis (VNS), September 1, 2011 and April 1, 2012.
Figure 14. 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 Maze Road Bridge (MRB), Vernalis (VER), Mossdale (MSD) and Rough & Ready (RRI), September 1, 2011 and April 1, 2012.
Figure 15. Daily upstream Chinook passage at the Tuolumne River weir in relation to instantaneous turbidity recorded at the weir, September 1, 2011 and April 1, 2012.
Figure 16. 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), September 1, 2011 and April 1, 2012.
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San Joaquin River Conditions
During the reporting period, flow in the San Joaquin River at Vernalis ranged from 1,520 cfs to 2,106 cfs (Figure 17). Daily average water temperature in the San Joaquin River ranged from 54.7�F to 62.8�F at Vernalis, from 55.2�F to 63.2�F at Mossdale, and from 55.9�F to 59.3�F at Rough 'n Ready Island (Figure 18). Daily average dissolved oxygen (DO) in the San Joaquin River fluctuated from 9.4 mg/L to 11.3 mg/L at Mossdale, and from 7.6 mg/L to 9.6 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island; Figure 19).
Figure 17. San Joaquin River flow at Vernalis from April 1, 2011, through April 1, 2012.
Figure 18. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from April 1, 2011, through April 1, 2012.
Figure 19. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from April 1, 2011, through April 1, 2012.
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Delta ExportsMean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 0 cfs to 2,832 cfs (Figure 20). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 375 cfs to 5,260 cfs. Combined total exports (state and federal pumps) fluctuated during this reporting period, ranging from 1,101 cfs to 6,104 cfs.
Figure 20. Daily exports at the state and federal pumping stations from April 1, 2011, through April 1, 2012.
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