This chapter uses climate-sensitive decision environments along the Colorado River to illustrate the breadth and complexity of the water management issues and the role of climate in these contexts. The four examples are in: (1) the border region: international issues; (2) Arizona and California: interstate issues in the Lower Basin; (3) Native American water rights; and (4) conjunctive use and management: groundwater and surface water in Arizona. Published in Drought and water crises: science, technology, and management issues, in 2005.