Many of the snaketail dragons are fairly rare. A couple types like the St Croix and Sioux snaketailes have only been discovered in the past decade and have only been found in small numbers. The main reason is that many of the snaketail nymphs are susceptible to water pollution and contaminants. Since most burrow in the sand at the bottom of the stream or river they can only be affected by river erosion and the depositing of silt on the bottom of the river.
This particular snaketail is the rusty snaketail, Ophiogomphus rupinsulensis. This is one of the more common snaketails that does not seem to be as affected by the river conditions as many others of the genus are. It is a mature male that was perched on a rock in the rapids of the Sunrise River where it empties into the St Croix River in Wild River State Park.