The U.S. Geological Survey operates a gaging station (USGS 13013650) on the Snake River near Moose, WY. The gage has daily flow data dating back to 1995. A record of surface water temperatures begins in October 2007.
The 2021 hydrograph for the Snake River at Moose, WY, was below the 1995 to 2020 average for much of the year and exhibited a pattern of high early summer flows and lower baseflows in late summer and fall. Average annual peak flow between 1995 and 2020 was 12,216 cfs and on average occurred on June 7 (day 158 of the year). Minimum annual daily flows over this same period of record averaged 777 cfs. In 2021, peak flows were 8,490 cfs and occurred on June 6 (day of year 157). Minimum flows in 2021 were 608 cfs.