Maps of the Area

The City of Lethbridge provides an Interactive Map of the area

Here are some of the official Government of Canada map sites.  You can find a wealth of map info from the following sites

Toporama http://atlast.nrcan.gc.ca/site/english/maps/topo/map

Geogratis - Geospatial data http://www.geogratis.ca/geogratis/en/index.html

GeoBase data http://www.geobase.ca

This is the official government of Canada topographical map 082h for the Lethbridge and area.  
The file is approximately 14 MB so it will take a while to download.

Topographical View 

This topographical map represents the Central to South Alberta and some of South Eastern British Columbia and South Western Saskatchewan

This is the same area as above through Google Earth