420 Mile Post signs being stolen

U.S. News: People Can't Stop Stealing 420 signs.

Stoners and other pranksters have been stealing the mileposts for years, and that has forced states to get creative with their signage.
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The Seattle Times [says] the state has over 8,000 mile markers. Of those, she said the department has had to replace 608 signs since 2012, and almost 200 mile markers are currently missing.
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It's not just milepost 420. Robbers with a juvenile sense of humor are notorious for stealing markers for mile 69, a number with an overt sexual connotation. States have tackled the issue in a similar way, creating posts for mile 68.9 or 68.5 instead[.]

Below left, an unknown 420 mile marker. Top right, Bong Recreational Area in Wisconsin. Bottom right, Bong Bridge, which connects Minnesota and Wisconsin. I've visited Bong Rec and driven over Bong Bridge many times. Everyone seems to enjoy the Bong experience.