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Mendenhall Lake at Lake Level, AK (MNDA2)


Data Type




Inundation Levels
NAVD88 Stage

71.015.0*
70.014.0*

Major Flooding Begins

69.013.0
68.012.0
Record Crest: 11.99 ft
67.011.0
66.010.0

Moderate Flooding Begins

65.09.0

Minor Flooding Begins

64.08.0

Near Flooding Begins

63.07.0
* = Extended rating
Weather Forecast Office Juneau, AK Alaska Pacific River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
3.7 ft at 12/12/2017 03:15:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
What is UTC time? Map Help

Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Gauge Information Collapse

Map Overlays

Flood Categories (in feet)
Major Flood Stage: 14
Moderate Flood Stage: 10
Flood Stage: 9
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 11.99 ft on 07/01/2016
(2) 11.85 ft on 07/11/2014
(3) 11.18 ft on 09/11/1995
(4) 10.92 ft on 07/22/2011
(5) 10.91 ft on 09/08/1981
(6) 10.88 ft on 08/12/2014
(7) 10.32 ft on 08/18/2009
(8) 10.26 ft on 08/23/2011
(9) 10.18 ft on 09/22/1993
(10) 9.76 ft on 09/01/2006
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.14 ft on 09/15/2016
(2) 9.49 ft on 09/11/2016
(3) 9.03 ft on 08/15/2016
(4) 11.99 ft on 07/01/2016
(5) 9.20 ft on 08/20/2015
(6) 10.88 ft on 08/12/2014
(7) 9.50 ft on 07/14/2014
(8) 11.85 ft on 07/11/2014
(9) 8.46 ft on 09/08/2013
(10) 8.36 ft on 07/06/2012
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

Site-specific information:

This interactive map depicts different flood scenarios on the Mendenhall River from Mendenhall Lake down to Fritz Cove. These high water scenarios were developed using recent Lidar data collected by the City and Borough of Juneau combined with a flow model. The flow model used provides the best analysis of flooding and flood depths that it can. However, high water events are dynamic and flood waters could end up in areas not depicted on the map.

This map is for planning and awareness purposes only and is not the regulatory Flood Insurance Rate Map (FIRM). To check a property's flood designation, place the address in the search query box of the FEMA Flood map located online at: FEMA National Flood Hazard Map. Differences may exist between these maps and the FEMA FIRM maps due to changes in topography and differences in mapping and modeling methods.

These inundation maps for the Mendenhall River were developed by the U.S. Army Corps of Engineers and National Weather Service in partnership with the City and Borough of Juneau.

The downstream end of the inundation mapping assumes a tidal elevation of +20.00 MLLW. Inundation downstream of the Brotherhood Street Bridge may be less than shown on these maps based on current tidal conditions.

SPECIAL NOTE ON PROJECT DATUM: The datum used for this mapping application is the same datum that is used in the current effective FEMA Flood Insurance Rate Maps. This datum is described in the 2013 report: "Juneau LiDAR and Orthophotos Technical Data Report – Final Delivery" available upon request from the City and Borough of Juneau.

Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
10.9 View Drive will be flooded and impassable with significant flooding to some homes in the area.
10.4 Significant flooding along the Mendenhall Lake area with more than 3 feet of water in places and the Mendenhall campground will be evacuated. Some homes along View Drive will have up to 3 ft of water in yards.
10 Water levels will inundate Mendenhall Campground with up to 3 feet of water covering low areas along with up to 1.5 feet of water covering West Glacier Spur Road. Portions of West Glacier Trail will be impassable.
9.69 There will be 7 inches of water over the West Glacier Spur Road between Skaters Cabin and West Glacier Trailhead. Campsite 7 will be flooded along with water flowing over the road between campsites 8 and 9 in the Mendenhall campground.
9.4 The yards along View Drive will start to flood and cause minor flooding.
9.09 Water covers West Glacier Spur Road between Skaters Cabin and West Glacier Trailhead, also water will flow into the Mendehall Lake Campground.
Photos
(1) NEW-Lookup table for the discontinued Mendenhall River gauge(NWS) and the Mendenhall Lake gauge(USGS
(2) Moderate flooding along Mendenhall River. MNDA2 = 10.5ft
(3) Flooding along the Mendenhall River near Meander Way. MNDA2 = 10.9ft
(4) Moderate flooding along View Drive. MNDA2 = 10.9ft.
(5) Flooding pictures of Mendenhall campground
(6) Flooding pictures of West Glacier spur road
(7) Bankfull stage 9.0ft #1
(8) Bankfull stage 9.0ft #2
(9) Bankfull stage 9.0ft #3
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
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Page last modified: 21-Dec-2016 10:42 PM
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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.