It helps to switch back to aerial photography once in awhile, as a sanity check. Note that the topo layer can be slightly misaligned in places. ![]() They can be hard to spot, especially where they are overlaid on roads and creeks, so it helps to keep the above observations in mind. Township boundaries are generally shown as black dashed lines. This layer displays a bunch of public domain topographic maps from the USGS laid out side-by-side. Now fire up your favorite editor and switch to the USGS Topographic Maps layer. For example, the smallest of rivers often serve as township lines because they were significant obstacles back when it took awhile to get to the nearest bridge.
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