A new paper by Darrin Ficklin and colleagues anticipates drying in the Upper Colorado River Basin, especially in its southern region:

The shift from semi-arid to arid conditions is likely to be especially prominent for the southern and central subbasins of the UCRB.

increasing aridity in the Upper Colorado River Basin, Ficklin et al.

Climate Change Impacts on Streamflow and Subbasin-Scale Hydrology in the Upper Colorado River Basin, Ficklin et al, PLOS One