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| Issue: Elevations of
Delta Islands-Fact vs. Fiction |
| The Bay Delta Conservation Plan and DSC-Delta
Plan often refer to the elevations of the lands of the Delta. The
problem is that in many, many important instances the elevations
depicted on the maps are WRONG. LIDAR and other elevation mapping
processes were utilized to ESTIMATE elevations in the Delta.
On-the-ground actual physial elevation surveys and records from the
landowners and past government studies show different levels than what
is reported, even in the latest BDCP and DSC Delta Plan. Since
both planning processes indicate restoration decisions will be based on
land elevations, this is a very important issue for Delta farmers and
other land owners. It does not cost that much to have elevations
determined, and there are actually some great websites that give an
indication of actual elevations, as opposed to the misleading and false
data provided by BDCP/DSC/DRMS documentation. This page provides
some of the maps and documents regarding elevations within the Delta
region. In addition, specific examples will be provided showing
the descrepence between the DWR-generated elevation maps and
on-the-ground reality. |
From 1978 to 1982 extensive surveys of the Sacramento San Joaquin Delta
region were conducted by USGS. Above is one of the maps.
Click on the map to see the full version. Elevations of most Delta
islands have NOT changed since the survey was done, unless the island
owners were planning to use the islands for In-Delta water storage, such
as is planned for Webb Tract and Bacon Island.
The map to the right (click for full size) shows the LOWEST surface
elevations for each of the Delta Islands studied. That does not
mean the whole island was that elevation. Keep the map in mind as
you study the latest elevation maps provided by BDCP and DSC below |
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Issues/elevations/Elevation2001.pdf
Issues/elevations/Elevation-dpc2011.pdf
Issues/elevations/Elevation-dwr-urs-2007.pdf
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Delta Flood Protection Program
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Issues/elevations/NorthDeltaRestorationMap_Sept_2009.sflb.ashx
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