David Grewe, filming at the foot of Swift Dam, gives some perspective to the magnitude of pent-up water that hung above the valley in 1964.
But how much water drained from the dam after its collapse on June 8?
We can only rely on an estimate — taken 17 miles downstream from the site of the collapse, when much of the water’s force had dissipated. At that point, hydrologists estimated the flow at 881,000 cubic-feet-per-second.
How much water is that? More than the flow rate of Mississippi River, sweeping down through homes set along Birch Creek. Photo by Benjamin Shors