Koyukuk River at Hughes, AK
River level and flood forecast · Yukon-Koyukuk County
The river is 17.2 ft below flood stage (64 ft).
Flow: 14,400 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Oct 11, 10:12 PM. Forecasts change as rain falls and as upstream water arrives.
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An email when the National Weather Service forecasts Koyukuk River at Hughes to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 70 ft |
| Moderate flood stage | 67 ft |
| Flood stage | 64 ft |
| Action stage | 62 ft |
| Record crest (August 22, 1994) | 70.8 ft |
What floods at each level
From the National Weather Service, highest first.
- 70 ftMajor flood stage. Water enters water treatment plant. Door sill of clinic, washeteria.
- 69 ftFloor of city office/post office begins to flood.
- 67 ftModerate flood stage. Water surrounds school and flooding of the school begins.
- 66 ftFloor of generator.
- 64.5 ftWater starts to go over tank farm berm.
- 64 ftWATER BEGINS TO GO OVER TOP OF BANK. Minor flood stage.
Highest crests on record
- 70.8 ft — August 22, 1994
- 69.15 ft — May 9, 2026
- 65.02 ft — August 31, 2025
- 62.66 ft — May 18, 2005
- 62.55 ft — August 22, 2024
Recent crests: 69.15 ft (May 9, 2026) · 65.02 ft (August 31, 2025) · 62.55 ft (August 22, 2024) · 61.66 ft (June 13, 2023) · 55.86 ft (May 23, 2022)
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (KRHA2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.