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Figure 2: Total trap nights for CWMP by target species and percent of overall effort.
GRIZZLY BEAR
This season, two survey areas in the North Cascades were maintained for detecting grizzly bears with an
additional goal of detecting the presence of any other rare carnivores such as gray wolves or wolverines in the
North Cascades (Figure 3).
The Baker River survey area had two installations, and both North Cascades National Park biologists and
volunteers revisited the sites to collect data. Volunteers retrieved the Thornton Lake camera, which was installed
in 2015 and remained active for 57 days before the batteries died. Two cameras have been out for multiple
seasons--one at Green Lakes and one at Blum Lakes. No photos have been received from these cameras, though
we are hopeful that retrieval missions this spring or summer will be successful as Thornton Lake was this past
year. These survey areas are in remote, relatively high-elevation locations in the North Cascades, most requiring
hours of off-trail navigation and bush-whacking to reach. The challenge that these locations have posed to our
