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Iliamna River near Pedro Bay

Highest listed crest 78.42 ftFlood stage 71.0 ft19 crests since 1996

The Iliamna River near Pedro Bay crested above flood stage 4 times among the 19 crests the National Weather Service lists from 1996 to 2016. The highest, 78.42 ft on October 1, 2003, was moderate flooding, 7.42 feet above flood stage.

The gauge

Highest listed crest
78.42 ft
October 1, 2003; 53,000 cubic feet per second
Flood stage
71.0 ft
No major stage set
Crests at major
0
4 above flood stage
Most recent flood crest
September 21, 2016
71.53 ft, minor flooding

Flood stages

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

Flood categories, Iliamna River near Pedro Bay
Action stage64.014Jul 7, 2015The level at which the NWS or its partners begin to take action
Flood stage (minor)71.03Sep 21, 2016Minimal or no property damage, but possibly some public threat
Moderate flood stage75.01Oct 1, 2003Some inundation of structures and roads near the stream

Every listed crest

19 crests from 1996 to 2016. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Iliamna River near Pedro Bay, 1996 to 2016 6065707580ft Flood stage 71.0 ft Jun 26, 1996: 63.98 ft, below flood stage; 5,040 cubic feet per secondSep 9, 1997: 67.86 ft, action stage; 9,300 cubic feet per secondJun 8, 1998: 71.82 ft, minor flooding; 14,800 cubic feet per secondSep 18, 1999: 71.16 ft, minor flooding; 13,800 cubic feet per secondAug 2, 2000: 69.20 ft, action stage; 11,000 cubic feet per secondJul 19, 2001: 69.44 ft, action stage; 11,400 cubic feet per secondNov 6, 2002: 70.93 ft, action stage; 17,400 cubic feet per secondOct 1, 2003: 78.42 ft, moderate flooding; 53,000 cubic feet per secondOct 4, 2004: 64.92 ft, action stage; 5,940 cubic feet per secondJun 10, 2006: 67.05 ft, action stage; 8,270 cubic feet per secondSep 13, 2008: 68.52 ft, action stage; 11,800 cubic feet per secondJul 29, 2009: 68.28 ft, action stage; 11,200 cubic feet per secondOct 10, 2009: 69.69 ft, action stage; 15,200 cubic feet per secondSep 15, 2011: 65.85 ft, action stage; 6,910 cubic feet per secondSep 22, 2012: 69.99 ft, action stage; 16,100 cubic feet per secondAug 7, 2013: 68.07 ft, action stage; 10,600 cubic feet per secondOct 13, 2013: 70.48 ft, action stage; 17,700 cubic feet per secondJul 7, 2015: 66.33 ft, action stage; 7,440 cubic feet per secondSep 21, 2016: 71.53 ft, minor flooding; 21,300 cubic feet per second Highest, 78.42 ft, Oct 1, 2003 2000200520102015

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Iliamna River near Pedro Bay 1990s: 2 2 2000s: 1 2010s: 1 1990s2000s2010s
  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, Iliamna River near Pedro Bay
1Oct 1, 200378.42+7.42Moderate53,000
2Jun 8, 199871.82+0.82Minor14,800
3Sep 21, 201671.53+0.53Minor21,300
4Sep 18, 199971.16+0.16Minor13,800
5Nov 6, 200270.93−0.07Action17,400
6Oct 13, 201370.48−0.52Action17,700
7Sep 22, 201269.99−1.01Action16,100
8Oct 10, 200969.69−1.31Action15,200
9Jul 19, 200169.44−1.56Action11,400
10Aug 2, 200069.20−1.80Action11,000
11Sep 13, 200868.52−2.48Action11,800
12Jul 29, 200968.28−2.72Action11,200
13Aug 7, 201368.07−2.93Action10,600
14Sep 9, 199767.86−3.14Action9,300
15Jun 10, 200667.05−3.95Action8,270
16Jul 7, 201566.33−4.67Action7,440
17Sep 15, 201165.85−5.15Action6,910
18Oct 4, 200464.92−6.08Action5,940
19Jun 26, 199663.98−7.02Below flood stage5,040

Lake and Peninsula Borough: every hazard · River floods across the country · Alaska

NOAA National Water Prediction Service, gauge ILRA2, 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.