The Culvert At Mile Seven
The culvert at mile seven is a six-foot corrugated steel pipe, installed in 1962, set at a gradient that by modern standards is somewhere between indefensible and criminal. It carries the Stillwater under a county road that connects two sections of a dairy land-base that was consolidated, in a series of transactions between 1954 and 1961, out of what had previously been three separate farms. The culvert predates the Clean Water Act by a decade. It predates the Endangered Species Act by eleven years. It predates the federal regulatory memory of how a culvert is supposed to be built to let a fish through.
At low flow, there is a drop on the downstream side of approximately seventy-six centimetres from the lip of the pipe to the surface of the tailout pool. An adult coho can sometimes jump seventy-six centimetres under excellent conditions — a deep plunge pool for the run-up, the right water temperature, the right angle of approach. Those conditions rarely obtain at mile seven in late September. The pool has filled in with sediment from upstream disturbance. The approach is constricted by riprap installed in 1987 to address a road-bed erosion problem that no longer exists. The pipe itself is perched — the bottom of the pipe sits about fifteen centimetres above the downstream water surface at summer base flow — which means there is no watered run-in, and the fish must launch from