16
Table 1. Total Trap nights for all target species survey areas in 2017.
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 in the North Cascades (Figure 3).
Figure 3: All grizzly bear installations for 2017 were located within the North Cascades National Park.
The Baker River survey area had two installations and volunteers revisited the site once, shortly after the initial
set-up. Data will be incoming in the summer of 2018, once accessibility has improved. Volunteers retrieved the
Green Lake camera, which was installed in 2015 and remained active for 267 days before the batteries died.
Three cameras have been out for multiple seasons; two from the 2015 season (one at Thornton Lake and one at
Green Lakes), and one from the 2016 season (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 Green Lakes 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 volunteers in the past have led to more careful thought on placement and team commitment prior to some
camera installations. For 2017, limited effort of four installations, 280 trap nights and 3 percent or our total effort
was focused on camera traps set to detect Grizzly bears in the North Cascades Complex (Table 2, Figure 2).
Total Trap Nights CWMP – 2017
Grizzly Bear 280
I-90 Wildlife 1638
Wolf 2775
Wolverine 4004
Canada Lynx 768
Total Trap Nights
9465
