Lewis and Clark National Wildlife Refuge Lewis and Clark National Wildlife RefugeStation reference point Brush Island (Open)205 acres East Grassy Island (Open)175 acres Fitzpatrick Island (Open)48 acres Goose Island (Open)49 acres Green Island (Open)370 acres Horseshoe Island (Open)716 acres Karlson Island (Open)1,115 acres Lois Island (Open)2,181 acres Marsh Island (Open)1,047 acres McGregor Island (Open)554 acres Miller Sands West (Open)519 acres Minaker Island (Open)252 acres Quinns Island (Open)849 acres Russian Island (Open)1,350 acres Seal Island (Open)305 acres Snag Islands (Open)435 acres Tronson Island (Open)212 acres Welch Island (Open)1,050 acres West Grassy Island (Open)272 acres Woody Island (Open)283 acres Emerald Heights (Closed)70 acres Karlson Dike (Closed)314 acres Miller Sands (Closed)638 acres Tongue Point (Closed)77 acres