Part of the Digital Collections of the New York Heritage website is a Map of Niagara Falls and Vicinity made by the Niagara Falls Power Company in 1927. This map was digitized by the Niagara Falls Public Library and can be found online at: https://nyheritage.contentdm.oclc.org/digital/collection/p15004coll9/id/21161/rec/6.
Below is a medium-sized download of the map. Click on the link above to zoom in and/or download your own copy.