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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at 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 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.

Hydrograph River at a Glance Download
Trail River near Lawing Stage (ft)Highest Observation: 4.4 ft at 9:00AM Sep 27, 2023Observed: 4.3 ft at 9:00AM Sep 28, 2023Observed: 4.2 ft at 8:00AM Sep 29, 2023Observed: 4.1 ft at 8:00AM Sep 30, 2023Forecast: 4.76 ft 4:00PM Oct 03, 2023Forecast: 4.73 ft 10:00PM Oct 03, 2023Forecast: 4.68 ft 4:00AM Oct 04, 2023Forecast: 4.63 ft 10:00AM Oct 04, 2023Forecast: 4.57 ft 4:00PM Oct 04, 2023Forecast: 4.52 ft 10:00PM Oct 04, 2023Forecast: 4.48 ft 4:00AM Oct 05, 2023Forecast: 4.51 ft 10:00AM Oct 05, 2023Forecast: 4.63 ft 4:00PM Oct 05, 2023Forecast: 4.85 ft 10:00PM Oct 05, 2023Forecast: 5.14 ft 4:00AM Oct 06, 2023Forecast: 5.44 ft 10:00AM Oct 06, 2023Forecast: 5.69 ft 4:00PM Oct 06, 2023Highest Forecast: 5.85 ft 10:00PM Oct 06, 2023MPTA2(plotting HGIRV) Graph Created (1:46PM Oct 3, 2023)ObservedForecast (issued 12:12PM Oct 3)Latest observed value: 4.1 ft at 8:00 AM AKDT 30-Sep-2023. Flood Stage is 10 ft
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Tabular Data (UTC)
Tabular Data (AKDT)
XML Data
RSS Files
Datum: Not Available
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 Downstream Gauge - at Cooper Landing
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
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(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)
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(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:11
KML Image
Gauge LocationGauge Map Marker
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 Collapse
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
(1) Trail River staff gauge on old bridge pier.
(2) Downstream stage 6.7ft
(3) Upstream stage 6.7ft
About This Location Collapse

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)
(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:

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Long-term Hydrograph
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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.
NWS Information
National Weather Service
Anchorage Weather Forecast Office
6930 Sand Lake Road
Anchorage, AK 99502
(907) 266-5160
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