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Already existing in-water berm or "obstruction" blocking flow into head of Steamboat Slough is NOT blocking recreational boating, as berm is 10 feet below water surface, reducing depth of waterway from 19 feet down to 10 feet depth at lowest tides.  Note the NOAA navigation chart dated February 2014 is SUBSTANTIALLY INCORRECT regarding water levels on several North Delta waterways, representing the water levels as much more shallow than actually exists.
6/28/14  Several of us on the water have noticed that there is already an obstruction across part of our waterway, just east of the Steamboat Slough bridge.  It does NOT hinder boating navigation at all, but seems to make the entrance into the head of Steamboat Slough be 10 feet deep instead of 19 feet deep like it was in the past.  We surmise the purpose of this clearly defined in-water berm or obstruction was created by some agency associated with the fish migration studies, as the FUNCTION of the in-water struction manipulates the statistics of salmon migration through this waterway, where historically salmon always migrated.  The other FUNCTION of the in-water structure or berm is to block at least half of the fresh water flow that would have gone into Steamboat Slough to instead continue down the Sacramento River and into Georgian Slough for export to other areas of the state.  Paul Marshall from DWR acknowledged in an email that the "obstruction" exists but said it is naturally occuring.  That doesn't explain the observed rocks at side of obstruction nor the clear solid shear wall shown in the sonar.  Mr. Marshall provided me with screen shots of bathymetry soundings for several years for comparison.  It looks like the rocks may have been place in the waterway in 2008 but the shear structure perhaps later.  From the data provided by Mr. Marshall of DWR, a 3D model of the obstruction and channel was made, and you can view the graphics for the 3D model and/or the short video as you boat through the obstruction and channel.  
images-2014/news/barriers/3Dvideo-ssobstructionvideo.pdf links for the video.

3d-obstruction.pdf  Open this to see some of the graphics from the 3D rendition of the "obstruction".
ssbathymetry.pdf  Graphics provided by DWR-no guarantee they are accurate
MWDbarriers_07_majors.pdf  presentation by MWD in 2007 about why they want to block off the North Delta waterways
6/8/14 update:  DWR/USBR did not disclose that in-water berm or barrier crossing Steamboat Slough east of the Steamboat Slough bridge was already installed sometime in the past.  Using HD sonar with video, the location of what appears to be two barriers or berms with a very deep hole inbetween can be seen.  Hole or deep rut is under the Steamboat Slough bridge.  Go to this page to see photos of the sonar/fish screen and for links to the 3 short videos explaining what was found and where.  Why didn't DWR/USBR disclose the existence of this already-existing barrier to normal flow into Steamboat Slough?  Was the barrier put in to manipulate the outcome of the salmon migration pathway studies and the DSM2 flow studies?  Who authorized the work to be done, when, and what is causing the 35 foot deep large hole or rut under the bridge?  (see previous barriers pages here)

3 short videos on Youtube to explain
what was discovered using a good
sonar fish and depth sounder

Using sonar side profile and the bathymetry provided by
DWR, it was shown the in-water berm is actually 2
structures with a channel inbetween, and there is a 35'
hole under the Steamboat Slough bridge:

Underwater camera shows large rocks, perhaps a cement
lined channel in one section, and pretty shear wall
with very solid (dark blue) content for the wall.

2003 Steamboat Slough bridge, when the beach area
was larger and there were no apparent shoals to the
right of the bridge