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Volume 2010/11, Issue 2
September 30, 2010
In This Issue
Stanislaus River Weir Monitoring
Tuolumne River Weir Monitoring
San Joaquin Conditions
Delta Exports
events

VAMP Biology Technical Team Meeting:
Oct. 14

Stanislaus River Salmon Festival:
Nov. 14
links

FISHBIO

 
 
DFG Water Rights Program

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field notes
Stanislaus River Weir
  Photo by FISHBIO.
 
Key Highlights


2010 Stanislaus River Weir Monitoring began immediately after installation was completed on September 7, 2010. A total of 66 Chinook salmon were detected as they passed upstream through the weir between September 7 and 22.

2010 Tuolumne River Weir Monitoring began immediately after installation was completed on September 9, 2010. A total of 19 Chinook salmon were detected as they passed upstream through the weir between September 9 and 22.

San Joaquin River Conditions. San Joaquin River flow at Vernalis ranged between 1,226 cfs and 2,573 cfs. Water temperatures in the San Joaquin River ranged between 68.1F and 77.0F. Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated between 7.3 mg/L and 9.1 mg/L at Mossdale, and fluctuated between 5.5 mg/L and 7.1 mg/L at Rough 'n Ready.

Delta Exports. Combined total exports (state and federal pumps) fluctuated during the reporting period and ranged from 8,434 cfs to 11,532 cfs.
 

We encourage subscribers to contribute any relevant information for future issues of the newsletter (e.g., additional monitoring studies, announcements of upcoming meetings and events, etc). If you would like to contribute, please contact Chrissy Sonke.


 
2010/11 Stanislaus River Weir Monitoring 
 
Stanislaus River Weir
Figure 1. Stanislaus River Weir.

The Stanislaus River Weir fall-run Chinook salmon migration monitoring near Riverbank (RM 31.4) began immediately after installation was completed on September 7 (Figure 1). A total of 66 Chinook were detected by the Vaki Riverwatcher as they passed upstream through the weir between September 7 and 22 (Table 1). Daily passage ranged between zero and thirteen Chinook (Figure 2). The number of Chinook passages observed so far this year is greater than the numbers observed during this period in previous years (Table 1).

 

Instantaneous water temperature measured at the weir ranged between 62.4˚F and 72.0˚F and daily average water temperature at Ripon (RPN; RM 15) ranged between 67.4˚F and 74.1˚F (Figure 3), instantaneous turbidity ranged between 0.07 NTU and 1.21 NTU (Figure 4), and instantaneous dissolved oxygen ranged between 8.09 mg/L and 9.31 mg/L and dissolved oxygen at Ripon (RPN; RM 15) ranged between 7.8 mg/L and 9.3 mg/L (Figure 5).

 

Daily average flow in the Stanislaus River at Goodwin Dam (GDW; RM 58) remained stable between 200 cfs and 206 cfs. Flows at Ripon (RIP, RM 15) fluctuated between 185 cfs and 215 cfs (Figure 2). Note: flows downstream of Goodwin Dam may fluctuate from dam releases due to irrigation and other factors.

Table 1. Annual Fall-run Chinook passage prior to September 22, 2003-2010.

Cummulative Chinook passage 2003-2010


Flow and Catch
 
Figure 2. 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), and in the San Joaquin River at Vernalis (VNS), 2010.
 
Temp and Catch
 
Figure 3. 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),  2010.
turbidity and catch
 
Figure 4. Daily upstream Chinook passage at the Stanislaus River Weir in relation to instantaneous turbidity recorded at the weir, 2010.
Dissolved Oxygen and Catch
 
Figure 5. 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), 2010.

2010/10 Tuolumne River Weir Monitoring

The Tuolumne River Weir monitoring downstream of Fox Grove Fishing Access (RM 24) began immediately after installation was completed on September 9 (Figure 6).  A total of 19 Chinook were detected by the Vaki Riverwatcher as they passed upstream through the weir between September 9 and 22. Daily passage ranged between zero and four Chinook (Figure 7).

 

Tuolumne River Weir
Figure 6. Tuolumne River Weir fish passage modifications.

Instantaneous water temperature measured at the weir ranged between 66.0˚F and 70.1˚F (Figure 8), instantaneous turbidity ranged between 0.22 NTU and 1.20 NTU (Figure 9), and instantaneous dissolved oxygen ranged between 8.21 mg/L and 9.55 mg/L (Figure 10).

 

Daily average water temperature at Modesto (MOD; RM 17) ranged between 67.8˚F and 69.5˚F (Figure 8). Daily average flow in the Tuolumne River was stable between 287 cfs and 295 cfs at La Grange (LGN; RM 50) and fluctuated between 417 cfs and 481 cfs at Modesto (MOD; RM 17) (Figure 7). Note: flows downstream of La Grange may be higher than dam releases due to accretion and Dry Creek inflow.


Flow and Catch

Figure 7. 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), 2010.
 
Temp and Catch

Figure 8. 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), 2010.
 
turbidity and catch

Figure 9. Daily upstream Chinook passage at the Tuolumne River Weir in relation to instantaneous turbidity recorded at the weir, 2010.

Dissolved Oxygen and Catch

Figure 10. 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), 2010.

 
San Joaquin Conditions
 
During the reporting period, flows in the San Joaquin River at Vernalis ranged between 1,226 cfs and 2,573 cfs (Figure 11). Water temperature in the San Joaquin River ranged between 68.1F and 76.0F at Vernalis, from 69.6F to 77.0F at Mossdale, and from 71.8F to 76.7F at Rough 'n Ready Island (Figure 12). Average daily dissolved oxygen (DO) in the San Joaquin River fluctuated from 5.5 mg/L to 7.1 mg/L in the deep water ship channel (measured at Rough 'n Ready Island) and between 7.3 mg/L and 9.1 mg/L at Mossdale (Figure 13).

Flow 

Figure 11. San Joaquin River flow at Vernalis from September 1, 2009 through September 22, 2010.



Temperature 
 
Figure 12. San Joaquin River daily average water temperature at Vernalis, Mossdale, and Rough 'n Ready from September 1, 2009 through September 22, 2010.


 
Dissolved Oxygen
 
Figure 13. San Joaquin daily average dissolved oxygen at Mossdale and Rough 'n Ready, from September 1, 2009 through September 22, 2010.

Delta Exports
 

Mean daily pumping at the C.W. Jones Pumping Plant (federal pumps previously known as Tracy Pumping Plant) fluctuated during the reporting period and between 3,664 cfs and 4,178 cfs (Figure 14). Mean daily pumping at the Harvey O. Banks Pumping Plant (state pumps) ranged between 4,602 cfs and 7,440 cfs during the reporting period. Combined total exports (state and federal pumps) during this period ranged from 8,434 cfs to 11,532 cfs.
Exports
 
Figure 14. Daily exports at the Federal and State pumping stations from September 1, 2009 through September 22, 2010.