Portage Lake glacier (IMAGE) Seismological Society of America Caption The most active portion of the instability at Portage Glacier, looking down on Portage Lake and a tour boat in the distance. Credit Bretwood Higman Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.