References from surfing around. May or may not be relevant. Food for thought:
"... dragging the front edge of a reef. The front edge of a reef is determined by the current and which every edge of the reef the current touches first is considered the front edge. Often while fishing a reef for calico bass, barracuda, sand bass etc prime halibut habitat located near by. Halibut like to hang out in the transition zone between sandy bottom and reef."
From Newport Landing - Halibut Tips
http://www.newportlanding.com/halibutfishing.html
"... watch for underwater
hydraulic relief zones. Humps, bumps, depressions, valleys, and rock piles."
From GoFish Magazine - Halibut Tips
http://www.halibut.net/HalibutTipSheet.htm
Generally speaking, I like exploring the edges of lots of things, including the shoulders of drop-offs. Personally, I've done better on the shoulder of the channel in SD Bay than I have the bottom of the channel. I've heard the opposite from other halibut enthusiasts who like fishing the bottom of the channel.)