A State or local government will be in compliance with the ADA for new construction and alterations if it follows the 2010 ADA Standards for Accessible Design. Effective March 15, 2012 the 2010 ADA Standards must be used for new construction and alterations undertaken by state and local governments.
For additional information, take a look at the following resources:
FAQ: Where can I find a complete set of ADA standards for accessible design?
Fact Sheet: Overview of the 2010 Standards for Accessible Design