Ministry of Forests, Lands and Natural Resource Operations


The Upper Penticton Creek watershed experiment was established in 1984. The study area includes the watersheds of 240, 241 and Upper Dennis Creeks. These watersheds remained unlogged until 1995, except for a small area of blowdown salvage in 1992. The experiment follows a paired, pre- and post-treatment design with commercial clearcut logging in the 241 and Upper Dennis Creek watersheds.  The 240 Creek watershed remains an unlogged experimental control.

Road construction and clearcut logging began in late 1995 and progressed in phases interspersed with monitoring periods. By late winter of 2007, 47% of the 241 and 52% of the Upper Dennis Creek watersheds had been clearcut. Logging was completed using conventional ground-based techniques. All cutblocks have been reforested and non-essential roads deactivated. Second growth stands are fully restocked with lodgepole pine, some Engelmann spruce and subalpine fir.

Hydrometric measurements began in 1985. Since then a network of weather stations and snow survey grids have been established. Water quality monitoring began in 1992. In 2007, two deep (30 m and 50 m) wells were drilled at high elevation in the 241 Creek watershed.

Early research focused on seasonal and annual water yield. Study topics now include the water balance, nutrient transport, forest-snow interactions, water quality, aquatic ecology, channel morphology, groundwater, and the effects of climate change on water supplies. Research approaches include stand-scale field projects, assessment of watershed responses, and hydrologic modelling.


Long-term Installation Map

Logging history