From the record
“The Marked Tree Lock and Siphons are a flood control facility on the St. Francis River in Poinsett County, Arkansas.”
Wikipedia article Marked Tree Lock and Siphons, CC BY-SA 4.0.
One of 23 National Register listings published here for Poinsett County · listed in 1988 · category: District.
Sources: the Wikipedia article · the National Register database, National Park Service

