hey T Dodge,i've been to petersburg creek a few times it's a pretty nice stream there's just not a huge run of steelhead on it,about 115 per season on average for the states survey, but you can catch a few,best time is april-may,petersburg is on mitkof island,petersburg creek is on kupreanof island across the channel,access is by boat only to the mouth at high tide then hike up from there,if you don't have your heart set totaly on petersburg creek,another good option would be the thorne river on prince of wales island,or the situk river in yakutat,just remember all of these streams don't alow bait,and check the regs before fishing,hope this helps.
also try this site www.state.ak.us/local/akpages/FISH.GAME/sportf/region1/geninfo/steel_ed.htm

FISH ON!!!