The Thane Road @ Middle Pass RWIS ESS is located on the south side
of the Middle Pass avalanche chute. The ESS pole sits on an
elevated base on the left side of the southbound Thane Road.
Mountains lie to the east and Gastineau Channel is to the
west. A single-view camera provides an excellent view of
Thane Road northbound and the intersection of Snow Middle Pass and
Thane Road. Although there are no luminaires near this site,
ambient light from the rock dump area provides some a reasonable
amount of light at this sight. An infrared illuminator
provides a nighttime view to help in the avalanche detection. The
Juneau DOT Maintenance Station, approximately 8 miles to the north,
maintains Thane Road. Site Rationale
Thane Road, an urban commuter corridor and home of the Snettishim
power transmission line that provides most of Juneau’s
hydroelectric power needs, is located in in a prime
avalanche zone. Three significant avalanche chutes cross
Thane Road: Snowslide Gulch, Middle Pass, and Cross Bay.
Middle Pass has a 14.6 year return frequency. Thane Road is
in a precipitation enhanced area, with yearly precipitation totals
in excess of 150 percent of the airport. DOT has
deployed an avalanche camera detection system in collaboration with
the Alaska Electric Light and Power Company (AEL&P)
and the City and Borough of Juneau (CBJ), and the
DOT&PF Maintenance and Operations.