April 1, 2022 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of April 1
was near to above average. The snow pack in the St. Mary Basin was 96 percent,
and the Milk River Basin was 22 percent.
March precipitation across the Upper Missouri Basin ranged from near to below
average. Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
95 percent; Milk Canada, 75 percent; Lower Milk, 53 percent; above Toston,
61 percent; Toston to Ft. Peck, 62 percent.
March 2022 Upper Missouri Mean Precip Oct-Mar WY2022 Upper Missouri Mean Precip
Stream flow in the Upper Missouri Basin is forecast to be
below average during the upcoming Spring and Summer.
The St. Mary River is forecast to have 55 percent of average
April-September flows. Runoff is expected to range around
62 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri April 1, 2022 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 67 percent average storage, Clark Canyon was
holding 73 percent of average water, Gibson Reservoir had 66
percent of average stored water, and Fresno Reservoir had
61 percent of average stored water.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was below average
on April 1. The snow pack in the Upper Yellowstone Basin was 73 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 84,
81, and 74 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 88 and 80 percent of average, respectively.
Precipitation during March ranged from near to below average. The
upper Yellowstone River Basin received 54 percent of average precipitation
while the Lower Yellowstone River Basin reported 37 percent of average. The
Bighorn Basin received 65 percent of average precipitation while the
Wind River Basin received 104 percent of average. The Little Bighorn -
Upper Tongue Basin received 40 percent of average and the Powder River
had 44 percent of average precipitation.
March 2022 Yellowstone Mean Precip Oct-Mar WY2022 Yellowstone Mean Precip
Forecast stream flow in the Yellowstone Basin is below average
for the upcoming Spring and Summer. Stream flow for the
Yellowstone River above Sidney, Montana is forecast to be about
57 percent of average. Flow in the Tongue Basin is expected to be
54 percent of average. Flows in the Powder River are expected
to be about 37 percent of average.
Monthend storage at Boysen Reservoir was 108 percent of average.
Stored water in Buffalo Bill Reservoir was 90 percent of average.
Monthend storage was 98 percent of average at Bighorn Reservoir.
Yellowstone April 1, 2022 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
91 percent of average on April 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 85 percent of average. The snow
pack in the South Platte Basin was 90 percent of average.
Precipitation during March in the Upper North Platte Basin was 79
percent of average. In the Lower North Platte Basin, precipitation
was 93 percent of average. The North Platte Plains below Guernsy
Reservoir had 111 percent. The South Platte Mountains had 82
percent whereas the Plains had 104 percent of average March
precipitation.
March 2022 Platte Mean Precip Oct-Mar WY2022 Platte Mean Precip
Stream flow in the Platte Basin is forecast to be below
average during the upcoming Spring and Summer. Runoff
for streams above Seminoe Reservoir are expected to be
about 80 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 70 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 72 percent.
Stored water in the South Platte Basin was 101 percent of average
on April 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
