Slope Monitoring at Snoqualmie Pass

Slope Monitoring

Project

Rockslides and snow avalanches at Snoqualmie pass have caused frequent closures of I-90, so State and Federal agencies embarked on an avalanche bypass project.

Instrumented rock dowels at snoqualmie pass

Monitoring Requirements

WSDOT needed instrumentation for steep slopes directly above a work area. GEO installed 22 instrumented rock dowels. An AMTS system was also installed.

Remote monitoring station - Snoqualmie Pass

Power & Communications

Solar-powered loggers relay measurements by radio to a base station located at the top of the pass. There, a cell modem relayed the data to the web and the Washington DOT.