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Mendenhall Lake at Lake Level, AK (MNDA2)


Data Type




Inundation Levels
NAVD88 Stage

71.015.0*
Record Crest: 14.97 ft

Major Flooding Begins

70.014.0*
69.013.0
68.012.0
67.011.0

Moderate Flooding Begins

66.010.0

Minor Flooding Begins

65.09.0

Near Flooding Begins

64.08.0
63.07.0

Below Flooding Begins

* = 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:
2.0 ft at 03/19/2024 02:00:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
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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) 14.97 ft on 08/06/2023
(2) 11.99 ft on 07/01/2016
(3) 11.85 ft on 07/11/2014
(4) 11.56 ft on 08/14/2021
(5) 11.53 ft on 08/01/2020
(6) 11.18 ft on 09/11/1995
(7) 10.92 ft on 07/22/2011
(8) 10.92 ft on 07/19/2018
(9) 10.91 ft on 09/08/1981
(10) 10.88 ft on 08/12/2014
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.22 ft on 10/08/2023
(2) 14.97 ft on 08/06/2023
(3) 10.33 ft on 10/27/2022
(4) 8.99 ft on 10/01/2022
(5) 8.11 ft on 07/08/2022
(6) 11.56 ft on 08/14/2021
(7) 10.17 ft on 08/10/2020
(8) 11.53 ft on 08/01/2020
(9) 9.29 ft on 09/21/2019
(10) 10.43 ft on 08/09/2018
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
15 Up to 2 feet of water will be covering Killewich Dr. Water starts to enter the backyards of houses along the south side of Marion Dr. Rivercourt Way, Lakeview Ct, Center Ct, Parkview Ct, Turn St & Northland St could have up to 1.5 feet of water over the road. Up to 1 foot of water covering Riverside Dr at Tournure St.
14.5 Meander Way will be under 2 to 4 feet of water. Water will start to enter the lowest levels of several homes on Meander Way. Water will start to flow into backyards along Killewich Dr and onto Riverside Dr near Melvin Park. Significant flooding of multiple homes along View Dr.
14 Water starts to enter Northland St, Turn St, Stephen Richards Memorial Dr, Parkview & Center Ct. Up to 1 to 2 feet of water will cover Meander Way.
13.5 Water will begin to flood at the north end of Meander Way as well as Stream Ct & Northland St from storm drains. Also storm drains along Riverside Dr and Riverwood Dr start to back up. Severe bank erosion along unreinforced river banks.
13 Water begins to flow through some backyards of homes on the northside of View Dr and flood low lying areas. Locations on View Dr will see depths of 1 to 4 feet of water in homes.
12.5 2 to 4 feet of water in some backyards along Meander Way on the the river side.
12 Water starts to back up between Riverside Dr at Tournure St and Mendenhall River School. Significant bank erosion along unreinforced river banks.
11.5 Houses along the south side and the east end of View Dr will start to flood.
11 View Dr will be flooded and impassable with significant flooding to some homes in the area. 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. Portions of the Dredge Lake Trail System will be impassable. Flood waters start to reach Dredge Lake.
10.5 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 Dr will have up to 3 feet of water in yards.
10 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.
9.5 Areas along View Dr will start to flood and cause minor flooding of yards. There will be 0.5 feet of water over the Skaters Cabin Road between Skaters Cabin and West Glacier Trailhead. Campsite 7 will be flooded with water starting to flow over the road between campsites 8 and 9 in the Mendenhall Campground.
9 Water starts to cover Skaters Cabin Road between Skaters Cabin and West Glacier Trailhead, also water will flow into the Mendenhall Lake Campground.
7.7 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.
6.7 Nugget Falls trail begins to flood near the "causeway" at the end of the trail.
Photos
(1) Moderate flooding along Mendenhall River. MNDA2 = 10.5ft
(2) Flooding along the Mendenhall River near Meander Way. MNDA2 = 10.9ft
(3) Moderate flooding along View Drive. MNDA2 = 10.9ft.
(4) Flooding pictures of Mendenhall campground
(5) Flooding pictures of West Glacier spur road
(6) Bankfull stage 9.0ft #1
(7) Bankfull stage 9.0ft #2
(8) Bankfull stage 9.0ft #3
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Page last modified: 2-Nov-2020 7:34 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.