Updated streamflow reconstructions for the Upper Colorado River Basin
Article first published online: 11 MAY 2006
Copyright 2006 by the American Geophysical Union.
Water Resources Research
Volume 42, Issue 5, May 2006
How to Cite
2006), Updated streamflow reconstructions for the Upper Colorado River Basin, Water Resour. Res., 42, W05415, doi:10.1029/2005WR004455., , and (
- Issue published online: 11 MAY 2006
- Article first published online: 11 MAY 2006
- Manuscript Accepted: 19 JAN 2006
- Manuscript Revised: 9 NOV 2005
- Manuscript Received: 21 JUL 2005
 Updated proxy reconstructions of water year (October–September) streamflow for four key gauges in the Upper Colorado River Basin were generated using an expanded tree ring network and longer calibration records than in previous efforts. Reconstructed gauges include the Green River at Green River, Utah; Colorado near Cisco, Utah; San Juan near Bluff, Utah; and Colorado at Lees Ferry, Arizona. The reconstructions explain 72–81% of the variance in the gauge records, and results are robust across several reconstruction approaches. Time series plots as well as results of cross-spectral analysis indicate strong spatial coherence in runoff variations across the subbasins. The Lees Ferry reconstruction suggests a higher long-term mean than previous reconstructions but strongly supports earlier findings that Colorado River allocations were based on one of the wettest periods in the past 5 centuries and that droughts more severe than any 20th to 21st century event occurred in the past.