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Green River (WY-UT-CO) below Fontenelle Dam

Highest listed crest 18.74 ftFlood stage 16.5 ft57 crests since 1964

The Green River (WY-UT-CO) below Fontenelle Dam crested at major flood stage 1 time among the 57 crests the National Weather Service lists from 1964 to 2020. The highest, 18.74 ft on September 5, 1965, was major flooding, 2.24 feet above flood stage. 1 other gauge on the Green River (WY-UT-CO) crested above flood stage within a week of it, 1 at its own highest listed crest.

The gauge

Highest listed crest
18.74 ft
September 5, 1965; 19,400 cubic feet per second
Flood stage
16.5 ft
Major flooding from 18.5 ft
Crests at major
1
5th of 73 gauges in Wyoming
Most recent flood crest
June 25, 2017
16.63 ft, minor flooding
Location
Sweetwater County
Wyoming

Flood stages

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

Flood categories, Green River (WY-UT-CO) below Fontenelle Dam
Action stage15.510Jun 5, 2014The level at which the NWS or its partners begin to take action
Flood stage (minor)16.55Jun 25, 2017Minimal or no property damage, but possibly some public threat
Moderate flood stage17.53Jun 19, 1986Some inundation of structures and roads near the stream
Major flood stage18.51Sep 5, 1965Extensive inundation of structures and roads

Every listed crest

57 crests from 1964 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Green River (WY-UT-CO) below Fontenelle Dam, 1964 to 2020 101214161820ft Flood stage 16.5 ftMajor 18.5 ft Jul 6, 1964: 14.50 ft, below flood stage; 6,520 cubic feet per secondSep 5, 1965: 18.74 ft, major flooding; 19,400 cubic feet per secondMay 13, 1966: 14.12 ft, below flood stage; 5,640 cubic feet per secondJul 1, 1967: 16.25 ft, action stage; 10,200 cubic feet per secondJun 24, 1968: 15.83 ft, action stage; 9,580 cubic feet per secondJun 11, 1969: 16.19 ft, action stage; 10,200 cubic feet per secondMay 25, 1970: 13.92 ft, below flood stage; 4,900 cubic feet per secondJun 30, 1971: 16.55 ft, minor flooding; 10,500 cubic feet per secondJun 14, 1972: 17.79 ft, moderate flooding; 15,000 cubic feet per secondMay 31, 1973: 12.83 ft, below flood stage; 3,060 cubic feet per secondJun 25, 1974: 15.73 ft, action stage; 8,820 cubic feet per secondJul 8, 1975: 15.00 ft, below flood stage; 6,820 cubic feet per secondJun 2, 1976: 15.34 ft, below flood stage; 7,730 cubic feet per secondJun 20, 1977: 11.78 ft, below flood stage; 1,560 cubic feet per secondJun 20, 1978: 15.77 ft, action stage; 8,550 cubic feet per secondJun 4, 1979: 13.85 ft, below flood stage; 4,820 cubic feet per secondJun 23, 1980: 15.13 ft, below flood stage; 7,480 cubic feet per secondJul 3, 1981: 12.24 ft, below flood stage; 2,200 cubic feet per secondJul 3, 1982: 17.74 ft, moderate flooding; 14,100 cubic feet per secondJul 6, 1983: 17.08 ft, minor flooding; 12,200 cubic feet per secondJul 2, 1984: 15.35 ft, below flood stage; 7,760 cubic feet per secondMay 4, 1985: 17.24 ft, minor flooding; 12,600 cubic feet per secondJun 19, 1986: 17.69 ft, moderate flooding; 13,600 cubic feet per secondMay 20, 1987: 15.17 ft, below flood stage; 7,250 cubic feet per secondJun 1, 1988: 13.71 ft, below flood stage; 4,450 cubic feet per secondApr 21, 1989: 12.03 ft, below flood stage; 1,890 cubic feet per secondAug 4, 1990: 12.48 ft, below flood stage; 2,450 cubic feet per secondJun 19, 1991: 15.96 ft, action stage; 9,010 cubic feet per secondAug 22, 1992: 12.00 ft, below flood stage; 1,460 cubic feet per secondJun 11, 1993: 13.65 ft, below flood stage; 4,350 cubic feet per secondMay 10, 1994: 12.02 ft, below flood stage; 1,890 cubic feet per secondJul 14, 1995: 14.95 ft, below flood stage; 6,800 cubic feet per secondJun 21, 1996: 15.46 ft, below flood stage; 7,880 cubic feet per secondJun 16, 1997: 16.92 ft, minor flooding; 11,400 cubic feet per secondJul 10, 1998: 15.18 ft, below flood stage; 7,020 cubic feet per secondJun 13, 1999: 15.99 ft, action stage; 8,910 cubic feet per secondJun 8, 2000: 12.04 ft, below flood stage; 1,780 cubic feet per secondMay 2, 2001: 11.78 ft, below flood stage; 1,450 cubic feet per secondJul 1, 2002: 11.98 ft, below flood stage; 1,680 cubic feet per secondNov 9, 2002: 11.98 ft, below flood stage; 1,680 cubic feet per secondJul 6, 2004: 13.10 ft, below flood stage; 3,350 cubic feet per secondJun 9, 2005: 14.92 ft, below flood stage; 6,650 cubic feet per secondJun 3, 2006: 13.72 ft, below flood stage; 4,470 cubic feet per secondJul 26, 2007: 11.90 ft, below flood stage; 1,470 cubic feet per secondJul 9, 2008: 13.74 ft, below flood stage; 4,300 cubic feet per secondJun 15, 2009: 15.75 ft, action stage; 8,520 cubic feet per secondJul 2, 2010: 13.00 ft, below flood stage; 3,300 cubic feet per secondJul 17, 2011: 16.21 ft, action stage; 9,610 cubic feet per secondJun 25, 2012: 13.04 ft, below flood stage; 3,120 cubic feet per secondJun 5, 2013: 11.97 ft, below flood stage; 1,670 cubic feet per secondJun 5, 2014: 15.66 ft, action stage; 8,480 cubic feet per secondJun 10, 2015: 15.42 ft, below flood stage; 7,320 cubic feet per secondJun 19, 2016: 14.85 ft, below flood stage; 6,610 cubic feet per secondJun 25, 2017: 16.63 ft, minor flooding; 10,700 cubic feet per secondJun 15, 2018: 15.34 ft, below flood stage; 7,600 cubic feet per secondJun 25, 2019: 15.26 ft, below flood stage; 7,230 cubic feet per secondJun 13, 2020: 13.63 ft, below flood stage; 4,110 cubic feet per second Highest, 18.74 ft, Sep 5, 1965 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Green River (WY-UT-CO) below Fontenelle Dam 1960s: 1 1970s: 2 1980s: 4 4 1990s: 1 2000s: 0 2010s: 1 2020s: 0 1960s1970s1980s1990s2000s2010s2020s
  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

The 50 highest of 57 listed crests.

Highest listed crests, Green River (WY-UT-CO) below Fontenelle Dam
1Sep 5, 196518.74+2.24Major19,400
2Jun 14, 197217.79+1.29Moderate15,000
3Jul 3, 198217.74+1.24Moderate14,100
4Jun 19, 198617.69+1.19Moderate13,600
5May 4, 198517.24+0.74Minor12,600
6Jul 6, 198317.08+0.58Minor12,200
7Jun 16, 199716.92+0.42Minor11,400
8Jun 25, 201716.63+0.13Minor10,700
9Jun 30, 197116.55+0.05Minor10,500
10Jul 1, 196716.25−0.25Action10,200
11Jul 17, 201116.21−0.29Action9,610
12Jun 11, 196916.19−0.31Action10,200
13Jun 13, 199915.99−0.51Action8,910
14Jun 19, 199115.96−0.54Action9,010
15Jun 24, 196815.83−0.67Action9,580
16Jun 20, 197815.77−0.73Action8,550
17Jun 15, 200915.75−0.75Action8,520
18Jun 25, 197415.73−0.77Action8,820
19Jun 5, 201415.66−0.84Action8,480
20Jun 21, 199615.46−1.04Below flood stage7,880
21Jun 10, 201515.42−1.08Below flood stage7,320
22Jul 2, 198415.35−1.15Below flood stage7,760
23Jun 2, 197615.34−1.16Below flood stage7,730
24Jun 15, 201815.34−1.16Below flood stage7,600
25Jun 25, 201915.26−1.24Below flood stage7,230
26Jul 10, 199815.18−1.32Below flood stage7,020
27May 20, 198715.17−1.33Below flood stage7,250
28Jun 23, 198015.13−1.37Below flood stage7,480
29Jul 8, 197515.00−1.50Below flood stage6,820
30Jul 14, 199514.95−1.55Below flood stage6,800
31Jun 9, 200514.92−1.58Below flood stage6,650
32Jun 19, 201614.85−1.65Below flood stage6,610
33Jul 6, 196414.50−2.00Below flood stage6,520
34May 13, 196614.12−2.38Below flood stage5,640
35May 25, 197013.92−2.58Below flood stage4,900
36Jun 4, 197913.85−2.65Below flood stage4,820
37Jul 9, 200813.74−2.76Below flood stage4,300
38Jun 3, 200613.72−2.78Below flood stage4,470
39Jun 1, 198813.71−2.79Below flood stage4,450
40Jun 11, 199313.65−2.85Below flood stage4,350
41Jun 13, 202013.63−2.87Below flood stage4,110
42Jul 6, 200413.10−3.40Below flood stage3,350
43Jun 25, 201213.04−3.46Below flood stage3,120
44Jul 2, 201013.00−3.50Below flood stage3,300
45May 31, 197312.83−3.67Below flood stage3,060
46Aug 4, 199012.48−4.02Below flood stage2,450
47Jul 3, 198112.24−4.26Below flood stage2,200
48Jun 8, 200012.04−4.46Below flood stage1,780
49Apr 21, 198912.03−4.47Below flood stage1,890
50May 10, 199412.02−4.48Below flood stage1,890

The worst floods along the Green River (WY-UT-CO)

For this gauge's highest crests, the other gauges on the Green River (WY-UT-CO) that crested above flood stage within a week.

September 5, 1965: 18.74 ft here, major flooding

  • Green RiverWY · Sep 7, 1965 · 8.53 ft · Moderate · its highest

June 14, 1972: 17.79 ft here, moderate flooding

  • La BargeWY · Jun 11, 1972 · 10.34 ft · Moderate
  • Green RiverWY · Jun 16, 1972 · 7.98 ft · Minor

July 3, 1982: 17.74 ft here, moderate flooding

Gauges on the Green River (WY-UT-CO)

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

Flood gauges on the Green River (WY-UT-CO)
Warren BridgeWY6.06.04 ft, Jun 11, 19970
La BargeWY9.010.50 ft, Jun 9, 19860
Fontenelle Dam this gaugeWY16.518.74 ft, Sep 5, 19651
Green RiverWY7.08.53 ft, Sep 7, 19650

Other gauges in Sweetwater County

Flood gauges in Sweetwater County
Little America10.512.53 ft, Mar 12, 20170
Green River7.08.53 ft, Sep 7, 19650
Manila11.012.56 ft, Aug 18, 20240

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

NOAA National Water Prediction Service, gauge GBFW4, 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.