Halibut hold on banks, edges, and current-swept bottom throughout the straits around Wrangell, Etolin, Zarembo, and Mitkof islands, and charters here fish them alongside salmon. Most trips are multi-species days, dropping bait or jigs for halibut around the tide and trolling for salmon the rest of the time. Alaska halibut are generally taken anywhere from under a hundred to several hundred feet down; expect your skipper to pick depth by season and tide.
Be realistic about size: most Alaska charter halibut are 'chickens' in the 20–50 pound range, which many consider the best eating. Genuinely big fish come through Southeast waters every season, but no one can promise a barn door. What Wrangell reliably delivers is fresh fillets from calm water, plus shrimp, crab, and other bottomfish in the same neighborhoods if your operator runs gear for them.