Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Juneau, AK

Alaska Pacific River Forecast Center

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Inundation Mapping

Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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NOTE: Click here for Suicide Basin Monitoring Page NOTE: Forecasts for the Mendenhall Lake at Lake Level are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Gauge

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) 14.97 ft on 08/06/2023 (2) 10.33 ft on 10/27/2022 (3) 8.99 ft on 10/01/2022 (4) 8.11 ft on 07/08/2022 (5) 11.56 ft on 08/14/2021 (6) 10.17 ft on 08/10/2020 (7) 11.53 ft on 08/01/2020 (8) 9.29 ft on 09/21/2019 (9) 10.43 ft on 08/09/2018 (10) 10.92 ft on 07/19/2018 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available. For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:12 Legend FEMA Layer Gauge Location Disclaimer 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.

Flood Impacts & Photos

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10.9	View Drive will be flooded and impassable with significant flooding to some homes in the area. Locations below back loop bridge will begin to see flooding of some yards, significant bank erosion along with hazardous navigation from debris in the river.
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 as well as up to 1.5 feet of water covering Skaters Cabin Road. Portions of West Glacier Trail will be impassable.
9.69	There will be 7 inches of water over the Skaters Cabin Road between Skaters Cabin and West Glacier Trailhead. Campsite 7 will be flooded as well as 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 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) 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

About This Location

Latitude: 58.429722° N, Longitude: 134.572778° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 9 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 0 ft 9.1 ft Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Lake Level

Additional Information

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Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Alaska-Pacific River Forecast Center Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Search River Notes Nat'l Snow Information Alaska Snow Maps Flood Stage Definitions

Collaborative Agencies 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. NWS Information National Weather Service Juneau Weather Forecast Office 8500 Mendenhall Loop Road Juneau, AK 99801 (907) 790-6802 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:26 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities