Upper Colorado snowpack › Upper Green › Big Sandy Opening
Big Sandy Opening snowpack
NRCS SNOTEL station 342 at 9,100 ft in Sublette County, Wyoming, in the Upper Green basin, with daily records since Mar 5, 1979. Latest reading Oct 29, 2026.
Snow water equivalent
58%
of the 1991–2020 median for this date · 58% of average
SWE today
0.7 in
median 1.2 in · average 1.2 in
Water-year precipitation
189%
of average since Oct 1 · 3.4 in vs. 1.8 in
Toward the normal peak
5%
of the average peak, 13.6 in around Apr 8
This water year against the normals
Water year 2027Water year 20261991–2020 median1991–2020 average
Water-year precipitation
Water year 2027Water year 20261991–2020 average
Peak snowpack by water year
Since 1981 this station's snowpack has peaked as high as 24.1 in (Apr 25, 1986) and as low as 8.1 in (Mar 27, 1992). The 1991–2020 average peak is 13.6 in around Apr 8.
| Water year | Peak SWE (in) | Peak date | % of normal peak | April 1 SWE (in) | Days of data |
|---|---|---|---|---|---|
| 2026 | 10.8 | Apr 3, 2026 | 79% | 10 | 365 |
| 2025 | 12.4 | Apr 24, 2025 | 91% | 11.6 | 365 |
| 2024 | 14.1 | Apr 2, 2024 | 104% | 14 | 366 |
| 2023 | 16.7 | Apr 26, 2023 | 123% | 15 | 365 |
| 2022 | 12 | May 3, 2022 | 88% | 8.8 | 365 |
| 2021 | 11 | Apr 26, 2021 | 81% | 9.7 | 365 |
| 2020 | 11.2 | Apr 17, 2020 | 82% | 10 | 366 |
| 2019 | 14.9 | Apr 16, 2019 | 110% | 13.2 | 365 |
| 2018 | 14 | Apr 8, 2018 | 103% | 13.2 | 365 |
| 2017 | 23.1 | Apr 28, 2017 | 170% | 20.9 | 365 |
| 2016 | 11.8 | Apr 29, 2016 | 87% | 11.1 | 366 |
| 2015 | 10.2 | Apr 10, 2015 | 75% | 9.7 | 365 |
| 2014 | 16.3 | Apr 6, 2014 | 120% | 16 | 365 |
| 2013 | 11.5 | Apr 23, 2013 | 85% | 9.6 | 365 |
| 2012 | 13.6 | Mar 28, 2012 | 100% | 13.5 | 366 |
| 2011 | 19.6 | May 1, 2011 | 144% | 15.6 | 365 |
| 2010 | 10.4 | Apr 13, 2010 | 76% | 8.2 | 365 |
| 2009 | 14.3 | Apr 17, 2009 | 105% | 12.3 | 365 |
| 2008 | 14.3 | Apr 12, 2008 | 105% | 13.7 | 366 |
| 2007 | 11.1 | Apr 3, 2007 | 82% | 11 | 365 |
| 2006 | 16.1 | Apr 7, 2006 | 118% | 15.4 | 365 |
| 2005 | 15.5 | Apr 9, 2005 | 114% | 15.4 | 365 |
| 2004 | 13.2 | Apr 8, 2004 | 97% | 12 | 366 |
| 2003 | 12.3 | Apr 8, 2003 | 90% | 12 | 365 |
| 2002 | 13 | May 2, 2002 | 96% | 12.1 | 365 |
| 2001 | 12.6 | Apr 12, 2001 | 93% | 9.9 | 365 |
| 2000 | 12.4 | Apr 19, 2000 | 91% | 11.4 | 366 |
| 1999 | 17.3 | Apr 25, 1999 | 127% | 16.3 | 365 |
| 1998 | 14.4 | Apr 18, 1998 | 106% | 12.2 | 365 |
| 1997 | 19.8 | Apr 12, 1997 | 146% | 19.3 | 365 |
| 1996 | 16.3 | Apr 22, 1996 | 120% | 15.7 | 366 |
| 1995 | 20.7 | May 14, 1995 | 152% | 17 | 365 |
| 1994 | 14.2 | Apr 8, 1994 | 104% | 13.1 | 365 |
| 1993 | 17.1 | May 6, 1993 | 126% | 13.6 | 365 |
| 1992 | 8.1 | Mar 27, 1992 | 60% | 8 | 366 |
| 1991 | 16.2 | May 6, 1991 | 119% | 12.8 | 365 |
| 1990 | 12.3 | Apr 8, 1990 | 90% | 11.7 | 365 |
| 1989 | 13.2 | Apr 2, 1989 | 97% | 13 | 365 |
| 1988 | 8.4 | Mar 30, 1988 | 62% | 8.4 | 366 |
| 1987 | 11.8 | Mar 27, 1987 | 87% | 11.8 | 365 |
| 1986 | 24.1 | Apr 25, 1986 | 177% | — | 246 |
| 1985 | 12.4 | Mar 27, 1985 | 91% | 12.4 | 365 |
| 1983 | 21 | May 22, 1983 | 154% | 15.5 | 365 |
| 1982 | 21 | Apr 15, 1982 | 154% | 19 | 365 |
| 1981 | 9.5 | Apr 12, 1981 | 70% | 8 | 365 |
Water years with fewer than 150 days of data are omitted. Data: NRCS National Water and Climate Center AWDB (station 342:WY:SNTL), pulled nightly; current-year values are provisional. Station location: 42.6458, -109.2597. Other stations in the Upper Green basin are listed on the basin page.