Snake River above Jackson Lake — Streamflow Note

Current Status: Flow is running 3% above the 5-year median at 606 ft³/s, indicating normal conditions relative to historical patterns.

Recent Trend: Discharge has declined significantly in the past month, dropping 73.2% from 2,260 ft³/s (month-over-month) and 30.7% from 874 ft³/s (week-over-week). This sharp pullback is consistent with post-peak snowmelt dynamics — peak runoff typically occurs in May–early June in the Snake River basin, and we're now in the seasonal decline phase.

Year-over-Year Context: Despite the recent drop, flows remain 62.0% above last year's level at this time (374 ft³/s), reflecting either heavier snowpack carryover or later-melting conditions this year.

Interpretation: The current flow level is stable and healthy relative to the 5-year baseline, but the rapid recent decline warrants watching to ensure continued adequate supply. The year-over-year elevation suggests this is a higher-than-typical water year, which may support irrigation and power generation demands through the summer.