There are several lakes in California suffering the same fate, but a much smaller scale: docks, boat ramps and pleasure marina’s high and dry, akaline lake bed exposed, unhealthy dust blowing into neighboring communities.
All because too much water was diverted for other uses (too much to maintain the lake levels).
http://www.sanjose.com/underbelly/unbelly/Alviso/marina2.html
The marina isn't dredged because of stated concerns about stirring up toxic heavy metals in the silt and subsequent pollution of San Francisco Bay waters.