NWS Missouri River Basin/Pleasant Hill, MO

Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  June 24, 2025

 Upper Missouri Basin

May precipitation across the Upper Missouri Basin was below average. Precipitation summaries  include: Milk St. Mary, 46 percent; Milk Canada, 70 percent; Lower Milk, 78 percent;
above Toston, 100 percent; Toston to Ft. Peck, 77 percent.

May 2025 Upper Missouri Mean Precip                                  Oct-May WY2025 Upper Missouri Mean Precip

Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 108 percent average storage, Clark Canyon was
holding 106 percent of average water, Gibson Reservoir had 84
percent of average stored water, and Fresno Reservoir had
33 percent of average stored water.


Yellowstone Basin 

Precipitation during May was below average. The upper Yellowstone 
River Basin received 76 percent of average precipitation while the Lower 
Yellowstone River Basin reported 87 percent of average. The Bighorn 
Basin received 93 percent of average precipitation while the
Wind River Basin received 58 percent of average. The Little Bighorn -
Upper Tongue Basin received 103 percent of average and the Powder River
had 94 percent of average precipitation.

 May 2025 Yellowstone Mean Precip                                        Oct-May WY2025 Yellowstone Mean Precip

 

Month end storage at Boysen Reservoir was 99 percent of average. 
Stored water in Buffalo Bill Reservoir was 104 percent of average. 
Month end storage was 101 percent of average at Bighorn Reservoir.

 

Platte Basin 

Precipitation during May in the Upper North Platte Basin was 62
percent of average.  In the Lower North Platte Basin, precipitation
was 87 percent of average.  The North Platte Plains below Guernsy
Reservoir had 79 percent.  The South Platte Mountains had 134
percent whereas the Plains had 107 percent of average May
precipitation.

 

 May 2025 Platte Mean Precip                                            Oct-May WY2025 Platte Mean Precip

Stored water in the South Platte Basin was 98 percent of average
on June 1.

PRECIPITATION MAPS

May 2025	WY 2025
May 2025 Precipitation Percent of 1991-2020 Average	WY2025 Precipitation as Percent of 1991-2020 Average
May 2025 Basin Mean Precipitation	WY2025 Basin Mean Precipitation
May 2025 MBRFC Basin Mean Precipitation	WY2025 MBRFC Basin Mean Precipitation