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Volume 2012/13, Issue 7 
January 30, 2013
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In This Issue
Calaveras River Juvenile Migration Monitoring
Stanislaus River Juvenile Migration Monitoring
Tuolumne River Juvenile Migration Monitoring
Mokelumne River Juvenile Migration Monitoring
Stanislaus River Weir Adult Migration Monitoring
Tuolumne River Weir Adult Migration Monitoring
Mokelumne River Woodbridge Dam Fish Ladder Monitoring
San Joaquin Basin Escapement Surveys
San Joaquin River Conditions
Delta Exports
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Key Highlights
January 7, 2013 - January 20, 2013

Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 9 O. mykiss were captured, increasing the season total to 84.

 

Stanislaus River Juvenile Migration Monitoring

continued at Oakdale (RM 40) and a total of 10,691 Chinook salmon and 15 O. mykiss were captured, increasing the season totals to 12,964 and 18, respectively. Monitoring at Caswell Memorial State Park (RM 9) continued and a total of 12 Chinook salmon fry were captured, increasing the season total to 62.

Tuolumne River Juvenile Migration Monitoring

continued at Waterford (RM 30) and a total of 690 Chinook salmon were captured. Monitoring continued at Grayson (RM 5) and 1 Chinook salmon was captured. No Chinook salmon catch had been recorded at Waterford or Grayson prior to the reporting period.

 

Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 4,272 Chinook salmon were captured, increasing the season total to 5,008. Monitoring at Golf (RM 38) began on January 7 and a total of 86 Chinook salmon were captured.

 

Stanislaus River Weir Monitoring continued and 1 Chinook salmon passed upstream through the weir between January 7 and January 20, increasing the total to 7,043.

 

Tuolumne River Weir Monitoring continued with a total of 9 Chinook salmon passing upstream through the weir between January 7 and January 20, increasing the total to 2,114.

 

Mokelumne River Woodbridge Dam Fish Ladder Monitoring ended in mid-January. A total of 3 Chinook salmon passed upstream of the dam, increasing the total to 12,091.

 

San Joaquin Basin Escapement Surveys. Annual carcass surveys conducted by California Department of Fish and Wildlife (CDFW) ended during the reporting period.

 

San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged from 1,553 cfs to 2,267 cfs. Daily average water temperature in the San Joaquin River ranged from 43.5F to 47.3F at Vernalis, and from 44.1F to 48.0F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 10.3 mg/L to 11.4 mg/L at Mossdale, and from 8.8 mg/L to 9.8 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 3,910 cfs to 6,115 cfs.

2011/12 Calaveras River Juvenile Migration Monitoring 

The Calaveras River rotary screw trap at Shelton Road (RM 28) was operated eight days between January 7 and January 20 and a total of 9 O. mykiss were captured, increasing the total to 84. Daily catches ranged from zero to five individuals (Figure 1), and all O. mykiss captured were Age 1+ (100-299 mm) and were rated as silvery parr (n=8) and smolt (n=1). Average forklengths and weights of O. mykiss are provided in Table 1.

No Chinook salmon were captured during this reporting period. The season total remains at two.

 

Instantaneous temperature recorded at the trap ranged from 41.7F to 46.4F, and turbidity ranged from 1.05 NTU to 8.22 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) fluctuated between 30 cfs and 42 cfs, and at Bellota (MRS) flow fluctuated between 14 cfs and 103 cfs (Figure 1).

Table 1. Biosampling data for O. mykiss captured at Shelton Road between January 7, 2013 and January 20, 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.

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 10,691 Chinook salmon were captured, increasing the season total to 12,964. Average forklengths and weights of all Chinook salmon are provided in Table 2. Most of the fish measured were fry (n = 879), but parr (n=3) and smolt (n=16) were also observed, including 15 Chinook salmon greater than 100 mm.

 

A total of 15 O. mykiss were captured during the reporting period and rated as silvery parr (n=5) and smolt (n=10), increasing the season total to 18. 

Table 2. Biosampling data for Chinook salmon and O. mykiss captured and measured at Oakdale between January 7 and January 20, 2013. Parentheses indicate range.


 

Instantaneous temperature taken at the trap ranged from 44.2F to 48.7F, and turbidity ranged from 1.18 NTU to 14.28 NTU. Daily average flow at Goodwin Dam (GDW) ranged from 278 cfs to 285 cfs, and flow ranged from 308 cfs to 506 cfs at Ripon (RIP) (Figure 2).

 

Three trap efficiency evaluations were conducted during the reporting period with naturally spawned juvenile Chinook salmon fry marked caudal fin green (CFG). The preliminary estimated capture efficiencies were 10.6%, 13.2% and 21.5% at flows of 283 cfs, 283 cfs and 279 cfs, respectively (Table 3).

 

Table 3. Trap efficiency tests conducted at Oakdale between January 7 and January 20, 2013.
   

Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam (GDW) and Ripon (RIP) in 2013.

 

Stanislaus River rotary screw trap monitoring at Caswell Memorial State Park (RM 9) continued with a total of 12 Chinook salmon fry were captured, increasing the season total to 62 fry and 1 yearling. No O. mykiss were captured. Season total remains at one.  

 

Instantaneous temperature recorded at the trap ranged from 43.3F to 50.4F, and instantaneous turbidity ranged from 1.51 NTU to 31.70 NTU. Instantaneous dissolved oxygen measured at the trap ranged from 11.03 mg/L to 15.95 mg/L.

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 690 Chinook salmon were captured. Average forklengths and weights of all Chinook salmon are provided in Table 4. All of the fish measured were fry (n = 551). No Chinook salmon were captured prior to the reporting period.  

 

Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between January 7 and January 20, 2013. Parentheses indicate range.

Instantaneous temperature taken at the trap ranged from 43.1F to 48.5F, and turbidity ranged from 0.63 NTU to 6.84 NTU. Daily average flow at La Grange (LGN) was stable between 173 cfs and 176 cfs (Figure 3).

  

Two trap efficiency evaluations were conducted during the reporting period with naturally spawned juvenile Chinook salmon fry marked caudal fin orange (CFO). The preliminary estimated capture efficiencies were 22.2% and 13.2% at a flow of 176 cfs (Table 5).

  

Table 5. Trap efficiency tests conducted at Waterford between January 7 and January 20, 2013.

 

Figure 3. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded at La Grange (LGN) between January 1 and January 20, 2013.

  

Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and 1 Chinook salmon fry (30 mm) was captured. No Chinook salmon were captured prior to the reporting period.

 

Instantaneous temperature taken at the trap ranged from 41.7F to 48.5F, and turbidity ranged from 0.54 NTU to 33.70 NTU. Daily average flow at Modesto (MOD) fluctuated during the reporting period due to a couple freshet events, ranging between 210 cfs and 518 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 January 20, 2013.


2011/12 Mokelumne River Juvenile Migration Monitoring  

Mokelumne River rotary screw trap monitoring at Vino Farms (RM 54) continued sampling intermittently during the reporting period. A total of 4,272 juvenile Chinook salmon were captured, increasing the season total to 5,008.

  

Average daily flow from Camanche Reservoir (CMN) ranged from 256 cfs to 500 cfs (Figure 5). Instantaneous temperature ranged between 46.0F and 49.6F, and instantaneous turbidity ranged between 1.32 NTU and 3.40 NTU.

 

Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir (CMN), between December 1, 2012, and January 20, 2013.


Mokelumne River rotary screw trap monitoring at Golf (RM 38) began on January 7 and sampling was intermittent during the reporting period. A total of 86 juvenile Chinook salmon were captured.

Average daily flow from Woodbridge Dam (WBR) ranged from 140 cfs to 346 cfs (Figure 6). Instantaneous temperature ranged between 46.8F and 49.5F, and instantaneous turbidity ranged between 1.70 NTU and 4.45 NTU.


 
Figure 6. Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Woodbridge Dam (WBR), between December 15, 2012, and January 20, 2013. 

2011 Stanislaus River Weir Adult Migration Monitoring   

 

Between January 7 and January 20 one Chinook salmon was detected by the Vaki Riverwatcher as they passed upstream of the Stanislaus River weir.The total passage to-date of 7,043 is the highest observed at the Stanislaus weir since monitoring began in 2003 (Figure 5; Table 6). Daily passage ranged between 0 and 1 Chinook salmon (Figure 7).

 

Instantaneous water temperature measured at the weir ranged between 44.9˚F and 49.2˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 44.7˚F and 49.2˚F (Figure 8). Instantaneous turbidity ranged between 2.0 NTU and 37.4 NTU (Figure 9). Instantaneous dissolved oxygen at the weir ranged between 10.85 mg/L and 13.47 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 9.44 mg/L to 11.20 mg/L (Figure 10).

 

Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) ranged from 278 cfs to 285 cfs. Flows at Ripon (RIP; RM 15) ranged from 308 cfs to 506 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 January 20, 2003-2012.
 
 
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.

2011 Tuolumne River Weir Adult Migration Monitoring 

  

Between January 7 and January 20 a total of 9 Chinook salmon were detected by the Vaki Riverwatcher as they passed upstream of the Tuolumne River weir. Total passage to-date of 2,114 is less than the 2,839 passages observed in 2011 at the Tuolumne weir (Table 7). Daily passage decreased during the reporting period, ranging between 0 and 2 Chinook salmon (Figure 11).

 

Daily average flow in the Tuolumne River ranged from 173 cfs to 176 cfs at La Grange (LGN; RM 50) and 210 cfs and 518 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 45.3˚F and 48.2˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 45.1˚F and 48.6˚F (Figure 12). Instantaneous turbidity ranged between 1.61 NTU and 3.11 NTU (Figure 13), and instantaneous dissolved oxygen ranged between 11.57 mg/L and 12.80 mg/L (Figure 14).

 

Table 7. Annual Fall-run Chinook passage prior to January 20, 2009 - 2012.
    

  

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.


Mokelumne River Woodbridge Dam 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. A total of 3 Chinook salmon were observed passing upstream of the dam before monitoring ended in mid-January, increasing the total for the season to 12,091. Daily passage ranged between 0 and 1 Chinook salmon (Figure 15).


Daily average flow in the Mokelumne River fluctuated between 258 and 503 cfs at Camanche Reservoir (CMN) and between 141 cfs and 380 cfs at Woodbridge Dam (WBR
).

 

  

Figure 15. 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 2012 and 2013.  


San Joaquin Basin Escapement Surveys

 

Annual carcass surveys conducted by CDFW ended on the Tuolumne River during the week of December 31 and on the Stanislaus and Merced rivers during the week of January 7. The number of live fish and redds observed on all rivers continued to be low during the final week of survey. Three live fish were observed on the Stanislaus River, 0 on the Tuolumne River and 3 on the Merced River. Three redds were observed on the Stanislaus, 29 on the Tuolumne and 0 on the Merced River. 

 

A total of 300 females were spawned at the Merced River Fish Facility (MRFF) during 2012 compared to 73 in 2011.

San Joaquin River Conditions

During the reporting period, flow in the San Joaquin River at Vernalis fluctuated from 1,553 cfs to 2,267 cfs (Figure 16). Water temperature in the San Joaquin River ranged from 43.5F to 47.3F at Vernalis, from 44.1F to 48.0F at Mossdale, and from 45.3F to 46.3F at Rough 'n Ready Island (Figure 17). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 8.8 mg/L to 9.8 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 10.3 mg/L to 11.4 mg/L at Mossdale (Figure 18).

 

Figure 16. San Joaquin River flow at Vernalis from January 1, 2012, through January 20, 2013.

 

Figure 17. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from January 1, 2012, through January 20, 2013.

   

 

 

Figure 18. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready, from January 1, 2012, through January 20, 2013.


Delta Exports

Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) ranged from 0 cfs to 2,812 cfs (Figure 19). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 2,499 cfs to 4,529 cfs. Combined total exports (state and federal pumps) during this period ranged from 3,910 cfs to 6,115 cfs
Figure 19. Daily exports at the state and federal pumping stations from January 1, 2012, through January 20, 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.