The objective of this part of the project is to examine the effect of climate and different forest harvest levels on watershed-scale hydrology in Alberta’s Foothills region. The three sub-watersheds at the Tri Creeks experi-mental watersheds established in 1965 were chosen: Eunice (control); Deerlick (64% clear-cut with streamside timber removal); and Wampus (52% clear-cut). In order to isolate effects of forest harvest from background climate variability, a combination of statistical and hydrological modelling approaches was used.