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Snake River at Flagg Ranch

Highest listed crest 10.75 ftFlood stage 10.0 ft42 crests since 1984

The Snake River at Flagg Ranch crested above flood stage 2 times among the 42 crests the National Weather Service lists from 1984 to 2025. The highest, 10.75 ft on June 5, 1996, was minor flooding, 0.75 feet above flood stage. 1 other gauge on the Snake River crested above flood stage within a week of it.

The gauge

Highest listed crest
10.75 ft
June 5, 1996; 15,000 cubic feet per second
Flood stage
10.0 ft
No major stage set
Crests at major
0
2 above flood stage
Most recent flood crest
June 5, 1997
10.16 ft, minor flooding
Location
Teton County
Wyoming

Flood stages

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

Flood categories, Snake River at Flagg Ranch
Action stage9.05May 28, 2014The level at which the NWS or its partners begin to take action
Flood stage (minor)10.02Jun 5, 1997Minimal or no property damage, but possibly some public threat
Moderate flood stage11.00—Some inundation of structures and roads near the stream

Every listed crest

42 crests from 1984 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Snake River at Flagg Ranch, 1984 to 2025 67891011ft Flood stage 10.0 ft May 31, 1984: 8.39 ft, below flood stage; 11,000 cubic feet per secondMay 27, 1985: 8.16 ft, below flood stage; 9,020 cubic feet per secondJun 6, 1986: 9.41 ft, action stage; 10,600 cubic feet per secondApr 30, 1987: 6.13 ft, below flood stage; 2,910 cubic feet per secondMay 27, 1988: 6.79 ft, below flood stage; 4,010 cubic feet per secondMay 10, 1989: 7.30 ft, below flood stage; 6,510 cubic feet per secondJun 11, 1990: 7.03 ft, below flood stage; 4,800 cubic feet per secondMay 25, 1991: 8.71 ft, below flood stage; 8,920 cubic feet per secondMay 7, 1992: 7.31 ft, below flood stage; 5,680 cubic feet per secondMay 21, 1993: 8.60 ft, below flood stage; 9,460 cubic feet per secondMay 13, 1994: 7.62 ft, below flood stage; 6,580 cubic feet per secondJun 6, 1995: 9.30 ft, action stage; 11,500 cubic feet per secondJun 5, 1996: 10.75 ft, minor flooding; 15,000 cubic feet per secondJun 5, 1997: 10.16 ft, minor flooding; 14,500 cubic feet per secondMay 30, 1998: 8.55 ft, below flood stage; 9,490 cubic feet per secondMay 28, 1999: 8.55 ft, below flood stage; 9,490 cubic feet per secondMay 26, 2000: 7.71 ft, below flood stage; 6,200 cubic feet per secondMay 16, 2001: 7.17 ft, below flood stage; 6,200 cubic feet per secondMay 31, 2002: 8.59 ft, below flood stage; 9,600 cubic feet per secondMay 29, 2003: 8.46 ft, below flood stage; 9,260 cubic feet per secondMay 6, 2004: 6.67 ft, below flood stage; 5,190 cubic feet per secondMay 20, 2005: 8.42 ft, below flood stage; 9,150 cubic feet per secondMay 22, 2006: 8.72 ft, below flood stage; 9,950 cubic feet per secondMay 13, 2007: 6.87 ft, below flood stage; 5,590 cubic feet per secondMay 19, 2008: 8.22 ft, below flood stage; 8,640 cubic feet per secondMay 31, 2009: 9.13 ft, action stage; 10,600 cubic feet per secondJun 4, 2010: 8.46 ft, below flood stage; 9,360 cubic feet per secondJun 24, 2011: 9.25 ft, action stage; 10,900 cubic feet per secondJun 4, 2012: 7.49 ft, below flood stage; 6,640 cubic feet per secondMay 15, 2013: 8.10 ft, below flood stage; 8,010 cubic feet per secondMay 28, 2014: 9.03 ft, action stage; 10,300 cubic feet per secondMay 2, 2015: 6.17 ft, below flood stage; 4,100 cubic feet per secondMay 9, 2016: 6.54 ft, below flood stage; 4,760 cubic feet per secondJun 5, 2017: 8.74 ft, below flood stage; 9,580 cubic feet per secondMay 26, 2018: 8.29 ft, below flood stage; 8,460 cubic feet per secondMay 17, 2019: 7.52 ft, below flood stage; 6,650 cubic feet per secondJun 1, 2020: 8.52 ft, below flood stage; 8,840 cubic feet per secondMay 19, 2021: 6.37 ft, below flood stage; 4,230 cubic feet per secondJun 13, 2022: 7.89 ft, below flood stage; 7,470 cubic feet per secondMay 24, 2023: 7.76 ft, below flood stage; 7,280 cubic feet per secondJun 6, 2024: 7.90 ft, below flood stage; 7,480 cubic feet per secondMay 30, 2025: 7.62 ft, below flood stage; 6,920 cubic feet per second Highest, 10.75 ft, Jun 5, 1996 1990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Snake River at Flagg Ranch 1980s: 0 1990s: 2 2 2000s: 0 2010s: 0 2020s: 0 1980s1990s2000s2010s2020s
  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, Snake River at Flagg Ranch
1Jun 5, 199610.75+0.75Minor15,000
2Jun 5, 199710.16+0.16Minor14,500
3Jun 6, 19869.41−0.59Action10,600
4Jun 6, 19959.30−0.70Action11,500
5Jun 24, 20119.25−0.75Action10,900
6May 31, 20099.13−0.87Action10,600
7May 28, 20149.03−0.97Action10,300
8Jun 5, 20178.74−1.26Below flood stage9,580
9May 22, 20068.72−1.28Below flood stage9,950
10May 25, 19918.71−1.29Below flood stage8,920
11May 21, 19938.60−1.40Below flood stage9,460
12May 31, 20028.59−1.41Below flood stage9,600
13May 30, 19988.55−1.45Below flood stage9,490
14May 28, 19998.55−1.45Below flood stage9,490
15Jun 1, 20208.52−1.48Below flood stage8,840
16May 29, 20038.46−1.54Below flood stage9,260
17Jun 4, 20108.46−1.54Below flood stage9,360
18May 20, 20058.42−1.58Below flood stage9,150
19May 31, 19848.39−1.61Below flood stage11,000
20May 26, 20188.29−1.71Below flood stage8,460
21May 19, 20088.22−1.78Below flood stage8,640
22May 27, 19858.16−1.84Below flood stage9,020
23May 15, 20138.10−1.90Below flood stage8,010
24Jun 6, 20247.90−2.10Below flood stage7,480
25Jun 13, 20227.89−2.11Below flood stage7,470
26May 24, 20237.76−2.24Below flood stage7,280
27May 26, 20007.71−2.29Below flood stage6,200
28May 13, 19947.62−2.38Below flood stage6,580
29May 30, 20257.62−2.38Below flood stage6,920
30May 17, 20197.52−2.48Below flood stage6,650
31Jun 4, 20127.49−2.51Below flood stage6,640
32May 7, 19927.31−2.69Below flood stage5,680
33May 10, 19897.30−2.70Below flood stage6,510
34May 16, 20017.17−2.83Below flood stage6,200
35Jun 11, 19907.03−2.97Below flood stage4,800
36May 13, 20076.87−3.13Below flood stage5,590
37May 27, 19886.79−3.21Below flood stage4,010
38May 6, 20046.67−3.33Below flood stage5,190
39May 9, 20166.54−3.46Below flood stage4,760
40May 19, 20216.37−3.63Below flood stage4,230
41May 2, 20156.17−3.83Below flood stage4,100
42Apr 30, 19876.13−3.87Below flood stage2,910

The worst floods along the Snake River

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

June 5, 1996: 10.75 ft here, minor flooding

  • JacksonWY · Jun 11, 1996 · 10.12 ft · Minor

June 5, 1997: 10.16 ft here, minor flooding

  • MooseWY · Jun 11, 1997 · 15.25 ft · Minor · its highest
  • JacksonWY · Jun 11, 1997 · 11.66 ft · Minor · its highest

Gauges on the Snake River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Snake River
Flagg Ranch this gaugeWY10.010.75 ft, Jun 5, 19960
MooseWY15.015.25 ft, Jun 11, 19970
JacksonWY10.011.66 ft, Jun 11, 19970
HeiseID8.011.26 ft, Jun 13, 19971
MenanID8.510.57 ft, Jun 9, 20110
Idaho FallsID13.218.91 ft, Jun 16, 19970
ShelleyID12.516.97 ft, Jun 17, 19184
BlackfootID10.513.55 ft, Jun 17, 19971
Blackfoot (Tilden Bridge-Ft. Hall)ID11.014.80 ft, Jun 18, 19970
NeeleyID9.511.46 ft, Jun 19, 19970
Minidoka Dam (at Howells Ferry)ID11.516.02 ft, Jun 21, 19180

Other gauges in Teton County

Flood gauges in Teton County
Lava Creek near Moran8.58.50 ft, Jun 9, 19810
Kelly8.09.87 ft, Jun 8, 20170
Jackson10.011.66 ft, Jun 11, 19970
Moose15.015.25 ft, Jun 11, 19970

Teton County: every hazard · River floods across the country · Wyoming

NOAA National Water Prediction Service, gauge FLGW4, 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.