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 Anchorage, AK

Alaska Pacific River Forecast Center

Hydrograph

River at a Glance

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

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Printable Image About this graph Tabular Data (UTC) Tabular Data (AKDT) Datum: Not Available Metadata

NOTE: Stage data may not be available during winter months. NOTE: Stage measured manually and reported by river observer. No automated gauge on-site. NOTE: Forecasts for the Trail River near Lawing are issued routinely during the warm season, and as needed at other times of the year.

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Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 13 Moderate Flood Stage: 11.5 Flood Stage: 10 Action Stage: 8.5 Low Stage (in feet): -9999 Historic Crests (1) 12.50 ft on 09/21/1995 (2) 11.93 ft on 09/18/1967 (3) 11.50 ft on 01/06/1999 (4) 11.09 ft on 10/24/2002 (5) 10.73 ft on 09/22/1976 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 7.20 ft on 06/26/2021 (P) (2) 9.70 ft on 10/03/2020 (3) 7.20 ft on 06/26/2020 (P) (4) 8.40 ft on 06/19/2018 (5) 7.70 ft on 09/01/2017 (P) Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available.

Zoom Level:11 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

If you notice any errors in the below information, please contact our Webmaster
12.5	This is the estimated level during the September 1995 flood event. Water was inundating parking lots and several roads around Moose Pass.
11.5	High water from the lake starts to encroach some structures at Moose Pass.
10	Water may begin to inundate nearby railroad tracks.
9.5	Water against the stringers on the Trail River Railroad Bridge. (Stringers are the structures on which the railroad ties sit.) -Oct 2020
Photos (1) Trail River staff gauge on old bridge pier. (2) Downstream stage 6.7ft (3) Upstream stage 6.7ft

About This Location

Latitude: 60.433056° N, Longitude: 149.373889° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 10 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 29 460 ft 470 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 Lawing

Additional Information

Long-term Hydrograph

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 Anchorage Weather Forecast Office 6930 Sand Lake Road Anchorage, AK 99502 (907) 266-5160 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:26 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities