The Haverstraw – Ossining Ferry by New York Waterway and the future Haverstraw – Yonkers – Lower Manhattan Ferry by New York Water Taxi are soon to move to the end of Main Street in the Village of Haverstraw. The plans, refined during summer 2006, have been approved recently by local and state officials. M G McLaren Engineering Group is continuing to work out the details and technical plans of the ferries’ new docks and facilities. The NY Water Taxi service to Lower Manhattan, with service to Yonkers in between, is expected to begin in late spring at the existing Haverstraw Ferry Pier on Dr. Girling Drive in the Village of Haverstraw. There is no publicly known timeline for the Main Street ferry terminal project, although some guess that ferries will be mooring at the base of Main Street as early as 2008 or 2009.
Correction: The NY Water Taxi Ferry from Haverstraw to World Financial Center and Pier 11 Wall Street, with stopping service in Yonkers, is expected to begin on August 1, 2007. More information here.
HaverstrawLife.com 
Work at the future ferry site has been confirmed to begin in the Spring of 2008. It should take about 1 to 1.5 years to finish construction and to move the existing ferry services to their new home.
For more information on the Haverstraw Ferry, including arrival and departure times for commuters, check out http://www.nywaterway.com/ferry/schedules/ferry-route.asp?ferryid=96
The Ferry from Haverstraw to the World Financial Center and Pier 11 – Wall Street will begin on August 1, 2007. Visit the website here, for more information about the current Yonkers to Manhattan Ferry: http://www.nywatertaxi.com/nywt.aspx?s=com&c=yonkers
Another update, confirming the new service will begin on August 1st! http://www.thejournalnews.com/apps/pbcs.dll/article?AID=/20070714/NEWS01/707140356
Obviously, the timeline for this project has been pushed indefinitely into the future. With the collapse of the Water Taxi Service to Lower Manhattan and stagnant growth on the existing New York Waterway Ferry to Ossining (the ferry route is maintaining its ridership at 2008 levels), the Ferry Terminal expansion at the end of Main Street is likely a distant endeavor. The economic fallout of the 2008 Oil Shock and the Recession that followed is blamed for the slow-down in this project. Hopefully, we can point to 2012 as a groundbreaking date for the Ferry’s move to Main.