Riparian vegetation includes black cottonwood (Populus trichocarpa), bulrush (Scirpus spp.), and cattails (Typha spp.). Willows (Salix spp.) are most common in the vicinity of the dam and the falls to the north and south of the Monument.
The Monument is also important to microbiotic plants, usually forming a soil crust or found on aging brush or rocks. USGS-BRD botanists have indicated that the exclusion of grazing makes portions of the Monument significant as a botanical preserve.
Facilitating the conservation of
Did You Know?
The best known discovery is the Hagerman Horse, Equus simplicidens is the official Idaho state fossil. The Hagerman Horse Quarry, a national natural landmark, is recognized as one of the most important sites in the world related to the fossil history of the horse.