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This answer is "you shouldn't", since it appears from your description it's not your land and you have no authority over it. Unauthorized private modifications to public land can be a serious prob...
Answer
#1: Attribution notice removed
by
System
·
2020-06-03T15:54:19Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/8166 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/