From BEEF’s enewsletter: 
Managing Livestock Water In A Drought 
After a spring of respectable rainfall, most of the western and southwestern U.S. is again beset with drought conditions ranging from moderate to exceptional. Check out the latest geographical drought update at: http://www.drought.unl.edu/dm/monitor.html . 

If you're interested in tips on stretching a tight water supply, check out "Livestock Water Management During A Drought" at: http://eesc.orst.edu/agcomwebfile/edmat/EM8588.pdf . This three-page fact sheet from Oregon State University is among the thousands of cow-calf production and management resources available at www.beefcowcalf.com , a free Web site from BEEF magazine produced exclusively for cow-calf producers. If you want still more information on drought, or info on a host of other management topics, go to the opening page of www.beefcowcalf.com and select "Drought Management" from the menu or enter any cow-calf topic into the "Search Titles" box. 
-- Joe Roybal