Tongass Narrows Tide Gauge at Ketchikan (MLLW datum)
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Upstream gauge unavailableDownstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 04/13/2025 1:06 AM AKDTOfficial Forecast (FCST) 04/12/2025 8:42 PM AKDTCATEGORY STAGE 
Major Flooding 22.5 ft Moderate Flooding 22 ft Minor Flooding 21 ft Action 20 ft Reliability of the Forecast: Forecast data shown here are guidance values only. Please refer to your local NWS office.
NOTE: Forecasts are issued routinely year-round.
Coastal flood impacts are dependent upon waves as well as tide level. High waves can result in flooding even if the tide level is below flood stage.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 22.5 - Mill Street, Steadman Street and half of cruise ship berths 1 & 2 are flooded.
- 22 - "Face" of crusie ship berths 1 & 2 floods along with a portion of Stedman Street near the Ketchikan Creek Bridge.
- 21 - Small parking lot on Stedman Street and Salvation Army floods.
Gauge Info
| Coordinates | 55.3331, -131.625 |
| RFC | APRFC |
| State | AK |
| WFO | AJK |
| County | Ketchikan Gateway |
| Data Provider(s) | |
| NOAA National Ocean Service and Meteorological Development Laboratory | NOAA NOS & MDL |
Gauge Location
Vertical Datum Table
| type | MLLW* |
|---|---|
| major Flooding | 22.50 ft |
| moderate Flooding | 22.00 ft |
| minor Flooding | 21.00 ft |
| action | 20.00 ft |
| Latest Value | 15.94 ft |
| Gauge Zero | 0.00 ft |
Gauge Photos
No Images Found
Probability Information
No Images Available
Unique Local Info
Vertical Datum references a tidal datum (MLLW), for more information see Tides and Currents.
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.