USGS released a new report today on data collected from 9 stations along the Colorado River in the Grand Canyon:
"Aeolian sand-transport data reported here, collected in the year before the March 2008 High-Flow Experiment (HFE) at Glen Canyon Dam, represent baseline data against which the effects of the 2008 HFE on windblown sand will be compared in future reports."
Ref: USGS Open-File Report 2009-1098, 2007 Weather and Aeolian Sand-Transport Data from the Colorado River Corridor, Grand Canyon, Arizona, 110p.