The Buffaloe Rd Neuse River launch access will be closed until October 2012 as the City of Raleigh constructs the Neuse River Greenway Trail. The Poole Rd launch will close approximately June 18th and won't reopen for 10 months (maybe April 2013). The Milburnie and Falls Lake dam access is open.
The City of Raleigh is posting the access closings on this page, Raleigh Parks Field Status instead of where you think they would post it here, Raleigh Canoe and Kayak Launch Sites.
Check the City of Raleigh's web site for updates on closings.