Steelhead fishing glossary

• Steelhead
  A migratory rainbow trout (Oncorhynchus mykiss) that spends most of its life in a large body of water — the ocean, or in the case of Great Lakes steelhead, one of the Great Lakes —…
• Steelhead Alley
  The colloquial name for the south-shore tributaries of Lake Erie that hold a stocked or self-sustaining steelhead trout fishery — primarily 22 rivers across Ohio, Pennsylvania, and…
• Centerpin (also: center-pin)
  A reel design that spins freely on a single central shaft, used with long rods (12-15 ft) to deliver a drag-free drift down a river current. The dominant Great Lakes steelhead tech…
• Spey casting
  A two-handed fly-casting technique using a long rod (12-15 ft) and specialized line to deliver a fly without backcast space behind the angler. Originated on Scotland's River Spey;…
• Nymphing
  A fly-fishing technique that drifts weighted nymph imitations along the bottom of a river, mimicking aquatic insects in their pre-emergence stage. The dominant fly-rod technique fo…
• 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. Ab…
• CFS (Cubic Feet per Second)
  The standard unit for river discharge in the United States, measured by USGS gauges across the country. One CFS = the volume of one cubic foot of water passing a fixed point per se…
• USGS gauge
  A streamflow measurement station operated by the United States Geological Survey. Each gauge publishes real-time flow rate (CFS), gauge height (feet), and sometimes water temperatu…
• Fishability rating
  A 4-tier rating (Excellent / Good / Fair / Poor) Steelhead Addiction publishes for each river, derived from a 0-11 score combining flow phase, water temperature, clarity, and weath…
• Great Lakes steelhead
  A migratory rainbow trout fishery in the Great Lakes (Lake Erie, Ontario, Michigan, Huron, Superior) that runs into tributary rivers to spawn. Distinct from Pacific-coast steelhead…

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