National Weather Service United States Department of Commerce

Suicide Basin Monitoring and Current Conditions




Suicide Basin is a side basin of the Mendenhall Glacier above Juneau, Alaska. Since 2011, Suicide Basin has released glacier lake outburst floods that cause inundation along Mendenhall Lake and Mendenhall River.


Current Status: 07/11/2022: Suicide Basin drained for the first time this year on July 7th and 8th. There was very minimal impacts downstream along the Mendenhall Lake or River. Some locations of the trail system along the lake were inundated. There is still water in the basin which is very slowly draining but there is no threat of flooding at this time. NWS, USGS and UAS will continue to monitor the situation and if Suicide Basin begins to fill we will provide updates. 


Additional Information available:




Latest Basin Image

Most recent image from the basin, updated at daily to sub-daily intervals (see time-stamp bottom right). The camera is placed at the basin entrance and faces northeast, into the basin. Click on image to enlarge and read basin levels.




Suicide Basin Lake Level - UNDER DEVELOPMENT
Daily updated graph tracking the lake level at Suicide Basin over the 2020 season (red line). The water level from the 2019 season is included for reference (blue line).





Last Two Week Time-Lapse

Animated time-lapse sequence, combining 15 daily images. 




2022 Last Two Week Time-Lapse Sequence With Vectors

Animated time-lapse sequence including velocity field with maximum height from 2021 and 2020. Color-coded arrows represent motion of the floating ice in the basin. Latest image with vectors.






Mendenhall Lake Stage Level


Graph showing the current (blue) and predicted (purple) stage level at Mendenhall Lake. Stage levels are annotated on the left y-axis on the graph. The graph also shows the Mendenhall River discharge (right y-axis), which is derived from the Mendenhall Lake stage level via rating curve.


Once an outburst flood event begins, water levels rise at Mendenhall Lake and Mendenhall River. Drainage initiation at Suicide Basin and water level rise at Mendenhall Lake and River can be offset by several hours.





Water levels on Mendenhall River







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