Here is a copy of the City of Hollywood North Lake Dredging Feasibilty Study done a few years ago that details the work and costs involved with dredging North Lake.
This is a large file (22mb): North Lake Dredging.ppt
Also, on May 14th, 2014, the City's consultant presented their recommendations for the Waterways Master Plan. These recommendations were voted on by the City Commission in June, 2014. Here is a copy of their presentation:
Hollywood Waterways Masterplan