Flood waters have begun to recede on Mendenhall Lake and the Mendenhall River.
The National Weather Service reports the lake crested at a record height of 11.8 feet around 4:30 p.m. Friday. The previous record of 11.2 feet was set in 1995.
“The rain is adding a little bit of water to the lake and the river, but it is a very minor player in what’s going on right now,” says Brian Bezenek, lead forecaster at the Juneau office.
The old record was likely set by heavy rain, Bezenek says, unlike the new one.
This week’s flooding was caused by a glacial outburst flood, also called a jökulhlaup. The last occurrence in the Mendenhall Valley was in 2012. The Mendenhall Glacier acts as a temporary dam in front of Suicide Basin, where water gradually accumulates. Water pressure and other factors eventually overcome the dam and the basin drains into the lake and river.
The Mendenhall River crested at 13.5 feet. Both crests fit under the weather service definition of moderate flooding.
“But the water should be falling rapidly through the evening and overnight,” Bezenek says.
No waves were visible on the lake Friday evening. A family of ducks swam down Skater’s Cabin Road as Forest Service officials blocked off the flooded roadway.
The flood warning remains in effect through 10 p.m. Saturday. City officials are asking people not to stop or stand on bridges to take photographs. They also say the banks of the Mendenhall River may be unstable and should be avoided.
View Drive remains closed, though barricades along Riverside Drive from Rivercourt Drive to Killewich Avenue are being removed. Alaska Electric Light & Power anticipates restoring power to View Drive and the Mendenhall Lake campground Saturday morning.
Bezenek says he thinks it will be business as usual in the area come Sunday.
Heather Bryant contributed to this report.
- For five years, Sharon Livingston has organized “Camp A”, where first-, second- and third-graders immerse themselves in traditional stories, crafts and foods. By encouraging kids to explore Unangan culture, she said they learn to see the value in cultures of all kinds.
- The National Transportation Safety Board is looking into the safety of Alaska skies during a hearing will take all today. The NTSB is looking into the wider issues surrounding the continued persistence of high numbers of accidents involving small planes and air taxis in Alaska.
- The Sun’aq Tribe won a grant to study the kind of threat that invasive crayfish in Alaska pose to subsistence resources. The award was announced Tuesday.
- After a contentious recall vote Tuesday, three embattled Haines Borough Assembly members will continue to serve out their terms. Nearly 60 percent of Haines voters rejected the allegations of official misconduct.