Clark Reservoir Rainfall ForecastUnited StatesMTPrairie CountyClark ReservoirToday 19 Apr10%Sun 20 Apr35%Mon 21 Apr80%Tue 22 Apr35%Wed 23 Apr10%Thu 24 Apr25%Fri 25 Apr35%Clark Reservoir rainfall forecast issued today at 2:04 am. Next forecast at approx. 4:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Glasgow RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads