Blog of the Pennsylvania State Historic Preservation Office

Mapping the Wallace Paths (aka those new red lines on CRGIS)

Recently, you may have noticed a new data set was added to CRGIS and you may be wondering what it is. This new data set appears to be several crisscrossing and winding paths – and they are!

These paths are the infamous “Indian Paths of Pennsylvania” as described by Paul A. W. Wallace in his book of the same name. This summer, two PennDOT interns, in collaboration with the PA SHPO, have revised data sets previously mapped by URS Corporation, Inc. and added these trails to CRGIS.

To do this, they utilized the shapefile created by URS and the Wallace Book descriptions of the paths. Since many of the paths no longer exist today, the two interns placed the them in a quarter mile buffer. This buffer approximates the location of the paths, allowing for error in the exact location.

Each path mapped on CRGIS has a pdf file attached to it. This file gives a summary of the entry for the path in the Wallace Book. This pdf includes historic accounts of the path, associated dates, Indian towns, historic towns, rivers, and more!

Map of Pennsylvania covered with lines.
Wallace’s “Key to the Indian Paths of Pennsylvania”.

Notably, anything labeled “historic” in the entries refers to the 1965-era towns or resources referenced by Wallace in his book that existed in 1965 but may or may not exist today.

Also, of note, the associated dates and the historical accounts are those mentioned by Wallace and no additional research was done to add any new information to these historic accounts. If a path has multiple historic names, it is mentioned in the data record as well as the pdf. A few paths mentioned in the book, were not mapped into CRGIS because they either lacked a map in the Wallace Book or did not have enough descriptive information to map.

The paths were added to the layer called “Aggregate” since they are compilations of data and not actual resources. They each have an eligibility status of “Undetermined” because they are not a resource subject to National Register evaluation. During planning processes, they should be considered an indicator that resources may be present, similar to a high probability area.

If you have any questions or concerns, contact the CRGIS staff at the State Historic Preservation Office.


  1. Lisa Dugas

    Great post Noel. Explaining why SHPO uses “Aggregate” and “Undetermined” status is helpful for better understanding other data in SHPO files.

  2. A. Lynn Smith

    Any reason why they are described as “infamous” rather than simply “famous”?

    • Robert Cluck

      Excellent question!

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