Science

Ecology Overview

Roper Lake State Park is located 6 miles south of Safford in Graham County in southeast Arizona. In 1974, under a management agreement with Arizona Game and Fish Commission, Arizona State Parks opened Roper Lake State Park to facilitate outdoor activities including hiking, camping, swimming, and fishing. Dankworth Pond was purchased by State Parks in 1975 and is managed as fishing “lake”. Roper Lake is comprised of a 30 surface acre lake and Dankworth Pond is comprised of a 15 surface acre lake. Dankworth Pond is located 3 miles south of Roper Lake. The Roper Lake-Dankworth Pond complex totals just over 338 acres including 20 acres of leased Bureau of Land Management property adjoining Dankworth Pond. Elevation at Roper Lake is 3,130 feet.

The Roper Lake-Dankworth Pond complex is bounded by a mix of agricultural land and Chihuahuan Desert Scrub. Characteristic or representative shrub species of the Chihuahuan Desert Scrub include Cresosotebush, Tarbush, Mesquite, Agave and Ocotillo. There is only one “endemic” plant species called lechugilla. The Chihuahuan Desert has a great diversity of wildlife species stemming from the riparian habitats, ephemeral streams, lakes, and sub-surface water aquifer.

Roper Lake’s hot spring flows through a man-made structure and then out of a pipe and into a wetland containing two large, cattail encircled pools before entering the lake approximately 800 feet downstream.

Roper Lake-Dankworth Pond complex is home to 5 species of amphibians, 1 turtle species, 9 lizard species, 10 species of snakes, 28 species of dragon and damselflies, and over 60 species of birds. Common mammal species such as collared peccary, desert cottontail, grey fox, and mule deer, raccoon, and coyote are present within park boundaries.

Native habitats, endangered species and plant community composition and diversity are impacted by the occurrence of less desirable native and non-native (also known as invasive) plant and animal species in Arizona. Problem non-native invasive species, due to their potential to invade an area and cause adverse ecological impacts found at Roper Lake–Dankworth Pond includes Saltcedar, Russian Olive, Bermuda grass, Mosquitofish, and Green sunfish. Cattail is a problem native invasive species, due to its potential to spread rapidly closing open water, reducing or eliminating wildlife habitat, reducing plant and animal species diversity, and decreasing water level stabilization.