Optimal flow zone
The range of river flow (in cubic feet per second) at which steelhead are most reliably catchable — typically the 30th-70th percentile of a river's historical flow distribution. Above the zone is too high and stained; below is low and clear.
Each river has its own optimal range based on watershed size, gradient, and gravel composition. Steelhead Addiction calculates per-river optimal zones from log-normal historical flow distributions, with empirical adjustments where angler reports support a tighter range. Conneaut Creek's optimal range is 150-350 CFS; the Cuyahoga's runs higher because the watershed is bigger. The optimal zone is shown as a dashed green band on each river's percentile-zoned gauge bar.
