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Koyukuk River at Hughes

Highest listed crest 70.80 ftFlood stage 64.0 ft12 crests since 1994

The Koyukuk River at Hughes crested at major flood stage 1 time among the 12 crests the National Weather Service lists from 1994 to 2026. The highest, 70.80 ft on August 22, 1994, was major flooding, 6.80 feet above flood stage.

The gauge

Highest listed crest
70.80 ft
August 22, 1994; 330,000 cubic feet per second
Flood stage
64.0 ft
Major flooding from 70.0 ft
Crests at major
1
18th of 110 gauges in Alaska
Most recent flood crest
May 9, 2026
69.15 ft, moderate flooding

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Koyukuk River at Hughes
Action stage62.02Aug 22, 2024The level at which the NWS or its partners begin to take action
Flood stage (minor)64.01Aug 31, 2025Minimal or no property damage, but possibly some public threat
Moderate flood stage67.01May 9, 2026Some inundation of structures and roads near the stream
Major flood stage70.01Aug 22, 1994Extensive inundation of structures and roads

Every listed crest

12 crests from 1994 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Koyukuk River at Hughes, 1994 to 2026 505560657075ft Flood stage 64.0 ftMajor 70.0 ft Aug 22, 1994: 70.80 ft, major flooding; 330,000 cubic feet per secondAug 3, 2003: 58.34 ft, below flood stageMay 28, 2004: 57.33 ft, below flood stageMay 18, 2005: 62.66 ft, action stageMay 18, 2006: 57.29 ft, below flood stageMay 30, 2007: 51.24 ft, below flood stageAug 3, 2021: 60.03 ft, below flood stage; 123,000 cubic feet per secondMay 23, 2022: 55.86 ft, below flood stage; 77,500 cubic feet per secondJun 13, 2023: 61.66 ft, below flood stage; 144,000 cubic feet per secondAug 22, 2024: 62.55 ft, action stage; 156,000 cubic feet per secondAug 31, 2025: 65.02 ft, minor flooding; 192,000 cubic feet per secondMay 9, 2026: 69.15 ft, moderate flooding Highest, 70.80 ft, Aug 22, 1994 200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Koyukuk River at Hughes 1990s: 1 2000s: 0 2010s: 0 2020s: 2 2 1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Koyukuk River at Hughes
1Aug 22, 199470.80+6.80Major330,000
2May 9, 202669.15+5.15Moderate—
3Aug 31, 202565.02+1.02Minor192,000
4May 18, 200562.66−1.34Action—
5Aug 22, 202462.55−1.45Action156,000
6Jun 13, 202361.66−2.34Below flood stage144,000
7Aug 3, 202160.03−3.97Below flood stage123,000
8Aug 3, 200358.34−5.66Below flood stage—
9May 28, 200457.33−6.67Below flood stage—
10May 18, 200657.29−6.71Below flood stage—
11May 23, 202255.86−8.14Below flood stage77,500
12May 30, 200751.24−12.76Below flood stage—

The worst floods along the Koyukuk River

For this gauge's highest crests, the other gauges on the Koyukuk River that crested above flood stage within a week.

August 31, 2025: 65.02 ft here, minor flooding

  • AllakaketAK · Aug 30, 2025 · 29.00 ft · Moderate

Gauges on the Koyukuk River

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Koyukuk River
AllakaketAK26.035.60 ft, Aug 30, 19941
Hughes this gaugeAK64.070.80 ft, Aug 22, 19941

Other gauges in Yukon-Koyukuk Census Area

Flood gauges in Yukon-Koyukuk Census Area
Allakaket26.035.60 ft, Aug 30, 19941
McGrath21.026.50 ft, May 18, 19720
Wiseman11.513.49 ft, Jun 16, 20260
Coldfoot18.720.86 ft, Aug 26, 20250
Manley Hot Springs15.019.55 ft, May 8, 20220
Nenana12.518.50 ft, Aug 18, 19671
Galena124.0131.00 ft, May 23, 19712
Ruby40.043.40 ft, May 14, 20260
Stevens Village61.063.00 ft, Jun 15, 19640

Yukon-Koyukuk Census Area: every hazard · River floods across the country · Alaska

NOAA National Water Prediction Service, gauge KRHA2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.