The East Twin Creek study area (53O 30' N, 120O 20' W) is located on the northeastern side of the Fraser River, approximately 35 Km northwest of McBride B.C. The East Twin drainage is a narrow, steep-sided valley running perpendicular to the Rocky Mountain Trench. The site is in the wet cool Interior Cedar-Hemlock subzone (ICHwk), at 900 to 1050 m. Slopes range from 20 to 65%.

The pre-harvest forest canopy was dominated by western redcedar (Thuja plicata), with minor components of western hemlock (Tsuga heterophylla), hybrid spruce (Picea glauca x engelmannii), and subalpine fir (Abies lasiocarpa). Important understorey species included Oplopanax horridus in the shrub layer and Gymnocarpium dryopteris, Tiarella trifoliata, and Cornus canadensis in the herb layer. The bryophyte layer was dominated by the mosses Ptilium crista-castrensis and Plagiomnium medium. Stand age was estimated at 300-350 years.

Treatments at East Twin include clearcut, group selection, and unlogged control. The site was harvested in March 2000.

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