1. Charts. Ontario, Lake. Lake Ontario, Thirty Mile Point to Port Dalhousie, including lower Niagara River; Lake Ontario coast chart 5. Scale 1:80,000. Bookmark Corporate/Agency Authors: Northern and Southwestern Lakes Survey, Engineer Department, and War Department Publisher: Northern and Southwestern Lakes Survey Date: Nov. 1933 SuDoc number: W 33.7/3:O 5/933