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How to check the river flows in the Delta
Below are links to various flow monitoring stations managed by USGS or DWR.  You can click on the links
to see what is the flow in a particular waterway.  There are also links to maps which link to the flow stations.
Note that USGS and DWR use different colors for their maps, so remember to use the map keys!
NOAA  radar https://www.weather.gov/Radar   for quick indication of storms in the area

USGS monitors and maps:

https://water.usgs.gov/floods/  USGS flood forcast map for a visual map of locations where flows may be at monitor of flood stage

https://waterwatch.usgs.gov/new/index.php?m=real&r=ca&w=map  USGS

https://waterdata.usgs.gov/ca/nwis/uv?site_no=11447650 Freeport

http://cdec.water.ca.gov/cgi-progs/stages/PAGE1  summary page

https://waterdata.usgs.gov/nwis/inventory/?site_no=11447850 Steamboat Slough

https://waterdata.usgs.gov/nwis/inventory/?site_no=11455420 Rio Vista

https://waterwatch.usgs.gov/new/index.php?r=18&m=flood&w=map Georgiana  Slough

California CDEC monitoring stations:

http://cdec.water.ca.gov/cdecstation2/  general map

http://cdec.water.ca.gov/stage_maps/lwrsac_0hr.html Lower Sacramento

http://cdec.water.ca.gov/stage_maps/joaquin_0hr.html San Joaquin

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=599&end=&geom=small&interval=30&cookies=cdec01  Freeport

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=13493&end=&geom=small&interval=30&cookies=cdec01
Sutter Slough  most of which flows into

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=13479&end=&geom=small&interval=30&cookies=cdec01 
Miners Slough, then to

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=10987&end=&geom=small&interval=30&cookies=cdec01
Steamboat Slough

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=27836&end=&geom=small&interval=30&cookies=cdec01 
flow or back up on lower Steamboat Slough

http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=13464&end=&geom=small&interval=30&cookies=cdec01
Ryer Island

Sacramento above DCC http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=10984&end=&geom=small&interval=30&cookies=cdec01

Georgiana http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=10981&end=&geom=small&interval=30&cookies=cdec01