From the Colorado Independent (Scot Kersgaard):
The study — commissioned by Protect The Flows and performed by Southwick Associates — only looked at the money spent by residents of the six-state Colorado River Basin. It did not consider money spent by people from outside these states.
The study contends that nearly 80,000 Coloradans owe their livelihood to the river and that river-related retail sales alone generate more income than agricultural production in Colorado.
Of the six states studied, which included Arizona, Wyoming, Utah, Nevada and New Mexico, Colorado was by far the leader in terms of jobs generated and money spent. Direct spending in the region amounts to just over $17 billion a year, with just under $6.4 billion of that spent in Colorado. California was left out of the study because by the time the river reaches California it has lost most of its recreational value.
More Colorado River basin coverage here.