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Where can I find an online Topographic map of Lake Washington?

The map needs to be relatively detailed, perhaps latitude and longitude lines. And free would be great. Any links would be appreciated, thank you!!

Public Comments

1. http://www.topozone.com/
2. http://www.topozone.com/map.asp?lat=47.6169&lon=-122.2636&datum=nad27&u=4&layer=DRG&size=l&s=250
3. Many detailed topo maps for popular wilderness areas are for sale at mountain shops and sporting goods stores. You can get topos for anywhere in the US from the US Geological Survey. These are very good maps.