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Koyukuk River at Allakaket

Highest listed crest 35.60 ftFlood stage 26.0 ft37 crests since 1971

The Koyukuk River at Allakaket crested at major flood stage 1 time among the 37 crests the National Weather Service lists from 1971 to 2025. The highest, 35.60 ft on August 30, 1994, was major flooding, 9.60 feet above flood stage.

The gauge

Highest listed crest
35.60 ft
August 30, 1994; 331,000 cubic feet per second
Flood stage
26.0 ft
Major flooding from 30.0 ft
Crests at major
1
18th of 110 gauges in Alaska
Most recent flood crest
August 30, 2025
29.00 ft, moderate flooding
Identifiers
NWS ALLA2
Out of service

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 Allakaket
Action stage23.014Aug 3, 2021The level at which the NWS or its partners begin to take action
Flood stage (minor)26.01May 26, 2019Minimal or no property damage, but possibly some public threat
Moderate flood stage28.01Aug 30, 2025Some inundation of structures and roads near the stream
Major flood stage30.01Aug 30, 1994Extensive inundation of structures and roads

Every listed crest

37 crests from 1971 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Koyukuk River at Allakaket, 1971 to 2025 152025303540ft Flood stage 26.0 ftMajor 30.0 ft May 31, 1971: 24.63 ft, action stageMay 30, 1972: 17.50 ft, below flood stageMay 24, 1973: 22.44 ft, below flood stageMay 15, 1974: 15.75 ft, below flood stageMay 14, 1975: 16.73 ft, below flood stageMay 21, 1977: 16.54 ft, below flood stageJun 25, 1978: 16.56 ft, below flood stageJun 12, 1979: 20.77 ft, below flood stageJun 7, 1980: 23.35 ft, action stageMay 22, 1981: 20.67 ft, below flood stageJun 15, 1982: 25.11 ft, action stageJun 2, 1983: 23.50 ft, action stageMay 14, 1990: 21.35 ft, below flood stageMay 8, 1991: 24.56 ft, action stageMay 28, 1992: 24.61 ft, action stageMay 18, 1993: 24.58 ft, action stageAug 30, 1994: 35.60 ft, major flooding; 331,000 cubic feet per secondAug 30, 1998: 20.28 ft, below flood stageMay 16, 1999: 19.65 ft, below flood stageJun 9, 2000: 19.02 ft, below flood stageMay 24, 2001: 23.94 ft, action stageMay 28, 2002: 24.19 ft, action stageMay 28, 2004: 21.74 ft, below flood stageMay 18, 2005: 24.46 ft, action stageMay 18, 2006: 19.69 ft, below flood stageJun 8, 2007: 16.57 ft, below flood stageMay 14, 2008: 21.24 ft, below flood stageMay 24, 2009: 22.21 ft, below flood stageMay 25, 2010: 17.99 ft, below flood stageMay 25, 2011: 22.75 ft, below flood stageJun 4, 2014: 22.75 ft, below flood stageJul 20, 2017: 24.75 ft, action stageJun 25, 2018: 23.63 ft, action stageMay 26, 2019: 27.96 ft, minor floodingMay 13, 2020: 25.90 ft, action stageAug 3, 2021: 24.50 ft, action stageAug 30, 2025: 29.00 ft, moderate flooding Highest, 35.60 ft, Aug 30, 1994 19801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Koyukuk River at Allakaket 1970s: 0 1980s: 0 1990s: 1 1 2000s: 0 2010s: 1 2020s: 1 1970s1980s1990s2000s2010s2020s
  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 Allakaket
1Aug 30, 199435.60+9.60Major331,000
2Aug 30, 202529.00+3.00Moderate—
3May 26, 201927.96+1.96Minor—
4May 13, 202025.90−0.10Action—
5Jun 15, 198225.11−0.89Action—
6Jul 20, 201724.75−1.25Action—
7May 31, 197124.63−1.37Action—
8May 28, 199224.61−1.39Action—
9May 18, 199324.58−1.42Action—
10May 8, 199124.56−1.44Action—
11Aug 3, 202124.50−1.50Action—
12May 18, 200524.46−1.54Action—
13May 28, 200224.19−1.81Action—
14May 24, 200123.94−2.06Action—
15Jun 25, 201823.63−2.37Action—
16Jun 2, 198323.50−2.50Action—
17Jun 7, 198023.35−2.65Action—
18May 25, 201122.75−3.25Below flood stage—
19Jun 4, 201422.75−3.25Below flood stage—
20May 24, 197322.44−3.56Below flood stage—
21May 24, 200922.21−3.79Below flood stage—
22May 28, 200421.74−4.26Below flood stage—
23May 14, 199021.35−4.65Below flood stage—
24May 14, 200821.24−4.76Below flood stage—
25Jun 12, 197920.77−5.23Below flood stage—
26May 22, 198120.67−5.33Below flood stage—
27Aug 30, 199820.28−5.72Below flood stage—
28May 18, 200619.69−6.31Below flood stage—
29May 16, 199919.65−6.35Below flood stage—
30Jun 9, 200019.02−6.98Below flood stage—
31May 25, 201017.99−8.01Below flood stage—
32May 30, 197217.50−8.50Below flood stage—
33May 14, 197516.73−9.27Below flood stage—
34Jun 8, 200716.57−9.43Below flood stage—
35Jun 25, 197816.56−9.44Below flood stage—
36May 21, 197716.54−9.46Below flood stage—
37May 15, 197415.75−10.25Below 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 30, 2025: 29.00 ft here, moderate flooding

  • HughesAK · Aug 31, 2025 · 65.02 ft · Minor

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
Allakaket this gaugeAK26.035.60 ft, Aug 30, 19941
HughesAK64.070.80 ft, Aug 22, 19941

Other gauges in Yukon-Koyukuk Census Area

Flood gauges in Yukon-Koyukuk Census Area
Hughes64.070.80 ft, Aug 22, 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 ALLA2, 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.