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Volume 2013/14, Issue 14
April 29, 2014
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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
San Joaquin River Juvenile Migration Monitoring
Stanislaus River Weir Adult Migration Monitoring
Tuolumne River Weir Adult Migration Monitoring
San Joaquin River Conditions
Delta Exports
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May 6-9

Bidwell Park Salmon Run
May 24

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Key Highlights
March 24, 2014 - April 20, 2014

 

Calaveras River Juvenile Migration Monitoring continued at Shelton Road (RM 28) and a total of 373 O. mykiss were captured, increasing the season total to 993.

 

Stanislaus River Juvenile Migration Monitoring continued at Oakdale (RM 40) and a total of 6,459 Chinook salmon were captured, increasing the season total to 79,037. No data was available for monitoring at Caswell Memorial State Park (RM 9) during the reporting period.

Tuolumne River Juvenile Migration Monitoring continued at Waterford (RM 30) and a total of 1,126 Chinook salmon were captured, increasing the season total to 11,142. A total of 3 Chinook salmon were captured at Grayson (RM 5).

 

Mokelumne River Juvenile Migration Monitoring continued at Vino Farms (RM 54) and a total of 729 Chinook salmon were captured, increasing the season total to 27,402. Monitoring continued at Golf (RM 38) and a total of 596 Chinook salmon were captured, increasing the season total to 837. Bypass trap monitoring was initiated on April 14 and 438 Chinook salmon were captured.

San Joaquin River Juvenile Migration Monitoring. On March 31 the California Department of Fish and Wildlife (CDFW) initiated kodiak trawling on the San Joaquin River near Mossdale and 438 Chinook salmon were captured during the reporting period.

 

Stanislaus River Weir Monitoring ended on April 11 and 5,461 Chinook salmon passed upstream through the weir during the 2013/14 season.

Tuolumne River Weir Monitoring continued and 3,777 Chinook salmon have passed upstream through the weir this season.

San Joaquin River Conditions. San Joaquin River flow at Vernalis increased from 560 cfs to 2,941 cfs. Daily average water temperature in the San Joaquin River ranged from 58.7F to 72.5F at Vernalis, and from 58.9F to 72.2F at Mossdale. Daily average dissolved oxygen (DO) in the San Joaquin River ranged from 9.4 mg/L to 18.3 mg/L at Mossdale, and from 6.9 mg/L to 9.5 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island).

Delta Exports. Combined total exports (state and federal pumps) increased during the reporting period, ranging from 1,179 cfs to 6,052 cfs.

2013/14 Calaveras River Juvenile Migration Monitoring

The Calaveras River rotary screw trap at Shelton Road (RM 28) operated 19 days between March 24 and April 20, and a total of 373 O. mykiss were captured, increasing the season total to 993. Daily catches ranged from 0 to 102 individuals (Figure 1). Peak passage was observed between April 1 (n=102) and April 2 (n=73) during a run-off event resulting from 1.01 inches of rain between March 31 and April 1. Most O. mykiss captured were young-of-year and rated as fry (n=266) and parr (n=22) but Age 1+ (100-299 mm) were also observed and were rated as parr (n=2), silvery parr (n=10) and smolt (n=4). Average forklengths and weights of O. mykiss are provided in Table 1.

No Chinook salmon were captured and the season total remains at eleven.

 

Instantaneous temperatures recorded at the trap ranged from 54.5F to 63.2F, and turbidity ranged from 0.35 NTU to 2.51 NTU. During the reporting period, daily average combined flow from New Hogan Dam (NHG) and Cosgrove Creek (COS) ranged from 18 cfs to 159 cfs, and at Bellota (MRS) flow ranged between 3 cfs and 82 cfs (Figure 1)

 

Table 1. Biosampling data for O. mykiss captured at Shelton Road between March 24, 2014 and April 20, 2014. Parentheses indicate range. 


Figure 1. For Nov. 2013 to March 2014: daily O. mykiss catch at Shelton Road (red), Calaveras River flow recorded by New Hogan Dam and Cosgrove Creek combined (blue), and flow recorded at Bellota (green).

2014 Stanislaus River Juvenile Migration Monitoring

Stanislaus River rotary screw trap monitoring at Oakdale (RM 40) continued, and a total of 6,459 Chinook salmon were captured, increasing the season total to 79,037. Average forklengths and weights of all Chinook salmon are provided in Table 3. Most of the fish measured were parr (n=1,111), but fry (n=100) and smolt (n=350) were also captured.

 

Table 2. Biosampling data for Chinook salmon captured and measured at Oakdale between March 24 and April 20, 2014. Parentheses indicate range. 

A total of 6 O. mykiss were captured during the reporting period, increasing the season total to 30.

 

Instantaneous temperatures recorded at the trap ranged from 53.3F to 59.2F, and instantaneous turbidity ranged from 0.33 NTU to 3.20 NTU. Daily average flow at Goodwin Dam (GDW) increased from 200 cfs to 2,584 cfs, and flow increased from 253 cfs to 2,276 cfs at Ripon (RIP) (Figure 2).

 

Five trap efficiency evaluations were conducted during the reporting period with naturally spawned juvenile Chinook salmon marked caudal fin green (CFG). Preliminary estimates of capture efficiency ranged from 9.8 to 21.7% at flows of ranging from 200 cfs to 430 cfs (Table 4). A total of 25 trap efficiency evaluations have been conducted this season

Table 3. Trap efficiency tests conducted at Oakdale between March 24 and April 20, 2014.

Figure 2. Daily Chinook salmon catch at Oakdale and Stanislaus River flow recorded at Goodwin Dam and Ripon, in 2013/2014.

No data were available for monitoring at Caswell Memorial State Park (RM 9) during the reporting period.


2014 Tuolumne River Juvenile Migration Monitoring

Tuolumne River rotary screw trap monitoring at Waterford (RM 30) continued and a total of 1,126 Chinook salmon were captured, increasing the season total to 12,268. Average forklengths and weights of all Chinook salmon are provided in Table 4. Most of the fish measured were parr (n=355), but fry (n=69) and smolt (n=209) were also measured.


Table 4. Biosampling data for Chinook salmon captured and measured at Waterford between March 24 and April 20, 2014. Parentheses indicate range.
 

No O. mykiss were captured during the reporting period.

  

Instantaneous temperature taken at the trap ranged from 56.7F to 67.7F, and turbidity ranged from 0.64 NTU to 15.20 NTU. Daily average flow at La Grange (LGN) increased from 162 cfs to 1,230 cfs (Figure 3).

  

Four trap efficiency evaluations were conducted during the reporting period with naturally spawned (CFON) and hatchery origin (CFOH) juvenile Chinook salmon marked caudal fin orange (CFO). Preliminary estimates of capture efficiency ranged from 3.1% to 7.4% at flows of ~160 cfs (Table 5). A total of 20 trap efficiency evaluations have been conducted this season.

 
Table 5. Trap efficiency tests conducted at Waterford between March 24 and April 20, 2014.

Figure 3. Daily Chinook salmon catch at Waterford and Tuolumne River flow recorded at La Grange (LGN) between January 1 and April 20, 2014.

Tuolumne River rotary screw trap monitoring at Grayson (RM 5) continued during the reporting period and a total of 3 Chinook salmon were captured (Table 6).

 

Instantaneous temperatures recorded at the trap ranged from 57.1F to 71.3F, and turbidity ranged from 1.38 NTU to 14.91 NTU. Daily average flow at Modesto (MOD) increased during the reporting period, ranging between 184 cfs and 1,110 cfs.


Four trap efficiency evaluations were conducted during the reporting period using hatchery origin juvenile Chinook salmon marked caudal fin pink (CFP).
Preliminary estimates of capture efficiency ranged from 1.9% to 11.8% at flows of ~200 cfs (Table 7).
 

Table 6. Biosampling data for Chinook salmon captured and measured at Grayson between March 24 and April 20, 2014. Parentheses indicate range.

 

Table 7. Trap efficiency tests conducted at Grayson between March 24 and April 20, 2014.
Figure 4. Daily Chinook salmon catch at Grayson and Tuolumne River flow recorded at Modesto (MOD) between January 1 and April 20, 2014. 

2013/14 Mokelumne River Juvenile Migration Monitoring 

Mokelumne River rotary screw trap monitoring at Vino Farms (RM 54) continued intermittently during the reporting period. A total of 729 juvenile Chinook salmon were captured, increasing the season total to 27,402.

Average daily flow from Camanche Reservoir (CMN) ranged from 204 cfs to 330 cfs (Figure 5). Instantaneous temperatures ranged between 52.5F and 57.0F, and instantaneous turbidity ranged between 1.35 NTU and 2.65 NTU.
Figure 5. Daily juvenile Chinook catches at Vino Farms and Mokelumne River flow recorded at Camanche Reservoir between December 1, 2013, and April 20, 2014.

Mokelumne River rotary screw trap monitoring at Golf (RM 38) continued sampling intermittently during the reporting period. A total of 113 Chinook salmon were captured, increasing the season total to 950 (Figure 6).

Instantaneous temperature ranged between 55.9F and 65.1F, and instantaneous turbidity ranged between 1.35 NTU and 3.78 NTU.

Figure 6 . Daily juvenile Chinook catches at Golf and Mokelumne River flow recorded at Camanche Reservoir between January 1 and April 20, 2014.

Mokelumne River monitoring at the Bypass trap (RM 38) was initiated on April 14 and a total of 438 Chinook salmon were captured (Figure 7).

 

Instantaneous temperature ranged between 63.9F and 64.8F, and instantaneous turbidity ranged between 1.80 NTU and 2.37 NTU. 
Figure 7. Daily juvenile Chinook catches at the Bypass trap and Mokelumne River flow recorded at Camanche Reservoir between April 1 and April 20, 2014.  

San Joaquin River Juvenile Migration Monitoring 

 

On March 31 the California Department of Fish and Wildlife initiated kodiak trawling on the San Joaquin River near Mossdale (i.e. the Mossdale Trawl). Fifteen days (ten tows per day) of trawling were conducted between March 31 and April 20. A total of 590 juvenile Chinook salmon were captured. Catch ranged between 0 and 123 Chinook salmon per 10 tows (Figure 8).  


     
Figure 8. Chinook salmon catch (per 10 tows) at the Mossdale Trawl and San Joaquin River flow recorded by Vernalis (VNS), 2014.

2013 Stanislaus River Weir Adult Migration Monitoring 

 

Stanislaus River Weir (RM 31) monitoring ended on April 11 and 1 Chinook salmon was detected passing upstream between March 24 and April 11, increasing the season total to 5,461 (Table 8).

 

Four O. mykiss were detected passing upstream during the reporting period, increasing the season total to 43. Ten of the O. mykiss observed this season have been positively identified as adipose fin clipped.

 

Instantaneous water temperature measured at the weir ranged between 57.1˚F and 65.0˚F, and daily average water temperature at Ripon (RPN; RM 15) ranged between 57.9˚F and 68.8˚F. Instantaneous turbidity ranged between 0.62 NTU and 2.62 NTU. Instantaneous dissolved oxygen at the weir ranged between 10.16 mg/L and 11.29 mg/L, and daily average dissolved oxygen at Ripon (RPN; RM 15) ranged from 8.66 mg/L to 9.88 mg/L.

 

Daily average flows in the Stanislaus River at Goodwin Dam (GDW; RM 58) increased from 200 cfs to 2,584 cfs (Figure 9). Flows at Ripon (RIP; RM 15) increased from 253 cfs to 2,276 cfs. Note: flows downstream of Goodwin Dam may differ from dam releases due to irrigation, precipitation, and other factors
 

Table 7. Annual fall-run Chinook passage at the Stanislaus River weir, 2003-2013.
     

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), 2013.


2013 Tuolumne River Weir Adult Migration Monitoring

 

A total of 8 Chinook salmon were detected at the Tuolumne River weir (RM 24) between March 24 and April 20 (Figure 10). Counts are not yet available from February 13 through February 19 due to the time required to review video footage. Season total is 3,777 (Table 9).

 

No O. mykiss have been detected at the Tuolumne River weir this season.

 

Daily average flow in the Tuolumne River ranged from 162 cfs to 1,230 cfs at La Grange (LGN; RM 50) and 184 cfs and 1,110 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 60.5˚F and 72.2˚F and daily average water temperature at Modesto (MOD; RM 17) ranged between 59.9˚F and 71.4˚F. Instantaneous turbidity ranged between 0.76 NTU and 5.95 NTU, and instantaneous dissolved oxygen ranged between 9.00 mg/L and 10.28 mg/L

 

Table 8. Annual Fall-run Chinook salmon passage, 2009 - 2013.


Figure 10. 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.

San Joaquin River Conditions
 
During the reporting period, flow in the San Joaquin River at Vernalis increased from 560 cfs to 2,941 cfs (Figure 11). Water temperature in the San Joaquin River ranged from 58.7F to 72.5F at Vernalis, from 58.9F to 72.2F at Mossdale, and from 61.7F to 70.0F at Rough 'n Ready Island (Figure 12). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 6.9 mg/L to 9.5 mg/L in the deep-water ship channel (measured at Rough 'n Ready Island), and from 9.4 mg/L to 18.3 mg/L at Mossdale (Figure 13).

Figure 11. San Joaquin River flows at Vernalis between April 1, 2013, and April 20, 2014.

    
Figure 12. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready between April 1, 2013, and April 20, 2014.


Figure 13. San Joaquin River daily average dissolved oxygen at Mossdale and Rough 'n Ready between April 1, 2013, and April 20, 2014.


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 4,241 cfs (Figure 14). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged from 0 cfs to 1,834 cfs. Combined total exports (state and federal pumps) during this period ranged from 1,179 cfs to 6,052 cfs
 
Figure 14. Daily exports at the state and federal pumping stations between April 1, 2013, and April 20, 2014.  

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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.