ShepherdsDog ShepherdsDog:
How long have we been keeping records on these rivers? The prairies also experience cyclical moisture patterns. Hell, there are rivers(Valley and Wilson specifically) around the Parkland, where my maternal grandmother and grandfather grew up, that I could walk across without getting wet. When they were younger, they swam in them, fished and were able to canoe up the river all the way from the Gilbert Plains region to Lake Dauphin.
Yeah there's a reason that there is a "Grand Valley" here on the prairie too. But it seems to be happening a lot these days.