At least one house has fallen into the Mendenhall River in Juneau after the Mendenhall Lake surpassed historic levels. The lake is fed by water coming from the Mendenhall Glacier and a geological feature called Suicide Basin, where water builds up and occasionally releases in a dramatic fashion.
Footage of the Riverside Drive house crashing into the river has been making the rounds on social media. (The video appears to have originated with Juneauite Sam Nolan.)
That lot of land is surrounded by others that are seeing erosion to their house foundations, including a condominium. The Zillow report for this house set the value at over $700,000.
Due to the flooding, Alaska Electric Light & Power has cut power to View Drive, Meander Way, and Stream Court. Earlier in the day, power was shut off at the Mendenhall Campground.
The City and Borough of Juneau Emergency Operations Center asks residents of Marion Drive to evacuate for the night due to the unstable situation along the bank. The city has closed the bridge on Back Loop Road, as well as the Dimond Park footbridge.

More information about this flood incident can be found at the National Weather Service at this link.
According to the National Weather Service, the Mendenhall Lake gauge continues to rise at just over 0.2 ft per hour and is over major flood stage.
“A glacial dammed lake release is occurring into Mendenhall Lake and River. Mendenhall Lake exceeded the previous record high stage of 12.0 ft at 12:30pm AKDT Saturday. The lake continues to rise and was at 14.7 feet at 9:15pm AKDT. Significant flooding with water being reported in areas that previously have not seen flooding is occuring. Significant bank erosion has been reported as well with at least one structure lost to the river. A forecast crest of around 15.0 ft is expected Saturday evening near 11:00pm. This forecast is uncertain as it is unknown how much water is left to drain out of Suicide Basin,” the agency reported.
“Inherent uncertainty in drainage efficiency and basin levels will result in varying crest height and timing. Please check back for updates as this event unfolds. The frequency of images has been adjusted to three times daily for monitoring. Images from the entire 2023 season can be viewed here.“


