From the record
“The Denis Julien Inscription is a rock-carved graffito purportedly left by French- American trapper Denis Julien in southern Utah when he was traveling in the area in the late 1830s or early 1840s, one of the first Europeans to enter the area. The inscription is within the boundaries of Canyonlands National Park, on the bank of the Colorado River.”
Wikipedia article Denis Julien Inscription (San Juan County, Utah), CC BY-SA 4.0.
One of 23 National Register listings published here for San Juan County · listed in 1988 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article