649
WGAK47 PAJK 120055 CCB
FLWAJK

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning...CORRECTED
National Weather Service Juneau AK
455 PM AKDT Tue Aug 11 2026

.A release from Suicide Basin has started and levels continue to drop
this afternoon. Levels on the Mendenhall have started to rise slowly
but will continue to rise as the release continues.

AKZ325-120900-
/O.COR.PAJK.FA.W.0001.260812T0038Z-260814T1230Z/
/00000.0.GO.000000T0000Z.000000T0000Z.000000T0000Z.OO/
City and Borough of Juneau AK-
455 PM AKDT Tue Aug 11 2026

...FLOOD WARNING FOR A GLACIER-DAMMED LAKE OUTBURST IN EFFECT UNTIL
430 AM AKDT FRIDAY...

* WHAT...Flooding caused by a glacier-dammed lake outburst is
  expected.

* WHERE...The Mendenhall Lake And River near the Mendenhall Glacier
  Recreation area, View Drive and below Back Loop bridge.

* WHEN...Until 430 AM AKDT Friday.

* IMPACTS...Flooding of the area around Mendenhall Lake and along the
  Mendenhall River is imminent. Water levels will, continue to rise
  and water temperatures will fall within the lake, and river.

* ADDITIONAL DETAILS...
  - At 438 PM AKDT, gauge data reported a glacier-dammed lake
    outburst. Flooding is expected to begin shortly, especially near
    The Mendenhall Lake And River.
  - The outburst flood forecast is based on an estimated volume of
    water in the glacier dammed lake and an estimated release rate
    based on previous events. The extent of water drainage within the
    basin (partial or full) can vary widely between outburst flood
    events and is a major source of uncertainty in the forecast,
    particularly with regard to the peak flood stage.
  - For Mendenhall Lake :
    At 4:00pm the stage was 4.2 feet.
    Flood Stage is 9.0 feet.
    Forecast: A crest between 16.1 and 16.6 feet is expected around
    5am and 9am Thursday. Water levels will go above minor flood
    state around 3pm Wednesday. Water levels will go above major
    flood stage around 1am Thursday.

Impacts:
At 6.7 feet: Nugget Falls trail begins to flood near the "causeway"
at the end of the trail.
At 7.7 feet: Nugget Falls trail begins to flood near the beginning of
the trail. Along the Mendenhall River some sections will experience
bank erosion resulting in dangerous tree fall. These conditions could
make floating the river more hazardous with the higher water levels.
At 9.0 feet: Water starts to cover Skaters Cabin Road between Skaters
Cabin and West Glacier Trailhead, also water will flow into the
Mendenhall Lake Campground.
At 10.0 feet: Water levels will inundate Mendenhall Campground with
up to 3 feet of water covering low areas as well as up to 1.5 feet of
water covering Skaters Cabin Road. Portions of West Glacier Trail
will be impassable. Areas along View Dr will start to flood and cause
minor flooding of yards. Closure of pedestrian pathways beneath
Brotherhood Bridge and the trail system on the west side of
Mendenhall River during outburst events.
At 11.0 feet: Some homes along View Dr will have up to 1.5 feet of
water in yards. Locations below back loop bridge will see bank
erosion along unreinforced river banks along with hazardous
navigation from debris in the river. Homes along the river on Meander
Way will begin to see flooding of some backyards on the outside of
the HESCO levee. Portions of the Dredge Lake Trail System will be
impassable. Flood waters start to reach Dredge Lake.
At 12.0 feet: Significant bank erosion along unreinforced river
banks. The low section of road past 9374 View Dr will be flooded with
up to 0.5 feet of water. Some houses on the south side and the east
end of View Dr will start to flood. Water begins to flood some
backyards of homes on the northside of View Dr as well as other low
lying areas. Back Loop Rd Bridge will be closed during outburst
events.
At 13.0 feet: The low section of road past 9374 View Dr will be
flooded with 2 ft of water. Water begins to flow through some
backyards of homes on the northside of View Dr and flood low lying
areas. A few locations on View Dr will see depths of 1 to 2 feet of
water in homes.
At 14.0 feet: The low section of road past 9374 View Dr will be
significantly flooded and impassable. Water will begin to flow over
the road from water flowing behind homes on the north side of View
Dr. More homes along View Dr will begin to see moderate to major
flooding. Locations on River Rd with low river banks will begin to
see water approach driveways.
At 15.0 feet: Major flooding of multiple homes along View Dr. Water
will begin to approach a few homes along River Rd with low river
banks with possible flooding of driveways and 1 to 2 feet of water in
backyards. Up to 1 foot of water covering Riverside Dr at Tournure St
and Mendenhall River School.
At 16.0 feet: Water starts to overtop the bank and flood low lying
areas near Wildmeadow Ln. Up to 0.5 feet of water will be in the
intersection of Skaters Cabin Rd and Arctic Cir. Some backyards of
homes between Tamarack Ct and Whitewater Ct will start to see flood
waters along with water approaching River Rd near homes with low
river banks and possibly flooding those homes. Water will start to
flood backyards of homes on Meadow Ln and Stikine St.
At 17.0 feet: This is an estimate that water will be overtopping the
river banks and flooding into the homes around Wildmeadow Ln.
Businesses in the Vintage Park Blvd area will be surrounded and
potentially inundated by flood waters. Homes on Meadow Ln from
Stikine St to Eagle St will be inundated with flood water. Water will
be covering Tournure St from Riverside Dr to Columbia Blvd. Black
Wolf Way and Pond Vista Dr will have water across the roads. All
parts of View Dr will be covered by flood water.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay tuned to further developments by listening to your local radio,
television, or NOAA Weather Radio for further information.

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

The cold water temperatures can increase the threat of hypothermia
and lower the time required to cause hypothermia.

&&

LAT...LON 5836 13462 5841 13460 5845 13460 5847 13456
      5846 13452 5844 13447 5843 13447 5840 13454
      5836 13459 5835 13460


$$

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