Streamflow trends over the past year at Similkameen River Near Nighthawk in an interactive calendar format. View seasonal patterns on the river and see how an evolving climate has affecting streamflow levels over the past year. Click on any day to see what the streamflow was for that day, or sign up for a free account to view data for the past 111,573 days. The streamflow average over the past 10 days was 261.9 ^cfs, with a day to day variation of about 14.9^cfs.