With the passage of the Federal Endangered Species Act in 1973, the stage was set for a confrontation between urban development and the provisions of Federal Law. Language was amended to the Act that established standards that a plan would have to meet before the Fish and Wildlife Service could approve it and issue a permit for the take of a listed species. In those jurisdictions that have adopted this approach, conservation of natural resources is no longer an afterthought but a major element that has to be considered during the regular land use permitting process.

The city of Phoenix Planning Department was asked to prepare a land use plan to identify goals and policies to guide development decisions for an area beyond the banks of the Salt River and to complement the Phoenix Rio Salado Habitat Restoration Project (Rio Salado Project). In response, the Planning Department initiated a five-phase planning process to develop an area plan. The resulting plan builds on the community's vision of how the area will develop in the future and identifies the steps needed to make that vision a reality.