Koyukuk River at Hughes
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
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Observed (OBS) 04/13/2025 4:30 AM AKDTRecord: 70.8 ftCATEGORY STAGE 
Major Flooding 70 ft Moderate Flooding 67 ft Minor Flooding 64 ft Action 62 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely during the warm season, and as needed at other times of the year.
Stage may be affected by ice.
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
- 70 - Major flood stage. Water enters water treatment plant. Door sill of clinic, washeteria.
- 69 - Floor of city office/post office begins to flood.
- 67 - Moderate flood stage. Water surrounds school and flooding of the school begins.
Gauge Info
| Coordinates | 66.0456, -154.262 |
| RFC | APRFC |
| State | AK |
| WFO | AFG |
| County | Yukon-Koyukuk |
| Data Provider(s) | |
| US Geological Survey | USGS 15564900 |
Gauge Location
Recent Crests
| 1. | 62.55 ft | on 08-22-2024 |
| 2. | 61.66 ft | on 06-13-2023 |
| 3. | 55.86 ft | on 05-23-2022 |
| 4. | 60.03 ft | on 08-03-2021 |
| 5. | 51.24 ft | on 05-30-2007 |
Recent Crests
| 1. | 62.55 ft | on 08-22-2024 |
| 2. | 61.66 ft | on 06-13-2023 |
| 3. | 55.86 ft | on 05-23-2022 |
| 4. | 60.03 ft | on 08-03-2021 |
| 5. | 51.24 ft | on 05-30-2007 |
| 6. | 57.29 ft | on 05-18-2006 |
| 7. | 62.66 ft | on 05-18-2005 |
| 8. | 57.33 ft | on 05-28-2004 |
| 9. | 58.34 ft | on 08-03-2003 |
| 10. | 70.80 ft | on 08-22-1994 |
Historic Crests
| 1. | 70.80 ft | on 08-22-1994 |
| 2. | 62.66 ft | on 05-18-2005 |
| 3. | 62.55 ft | on 08-22-2024 |
| 4. | 61.66 ft | on 06-13-2023 |
| 5. | 60.03 ft | on 08-03-2021 |
Historic Crests
| 1. | 70.80 ft | on 08-22-1994 |
| 2. | 62.66 ft | on 05-18-2005 |
| 3. | 62.55 ft | on 08-22-2024 |
| 4. | 61.66 ft | on 06-13-2023 |
| 5. | 60.03 ft | on 08-03-2021 |
| 6. | 58.34 ft | on 08-03-2003 |
| 7. | 57.33 ft | on 05-28-2004 |
| 8. | 57.29 ft | on 05-18-2006 |
| 9. | 55.86 ft | on 05-23-2022 |
| 10. | 51.24 ft | on 05-30-2007 |
Vertical Datum Table
| type | STND | NAVD88 | NGVD29 |
|---|---|---|---|
| major Flooding | 70.00 ft | 301.60 ft | 320.00 ft |
| moderate Flooding | 67.00 ft | 298.60 ft | 317.00 ft |
| minor Flooding | 64.00 ft | 295.60 ft | 314.00 ft |
| action | 62.00 ft | 293.60 ft | 312.00 ft |
| Latest Value | 47.98 ft | 279.58 ft | 297.98 ft |
| Gauge Zero | 0.00 ft | 231.60 ft | 250.00 ft |
Unique Local Info
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.