Renville County

portion of MCBS map of Renville County.

The Minnesota River valley is home to most of the remaining native habitats identified by MCBS in the counties that border the river, including distinctive plant communities that have developed over hundreds and thousands of years on some of the oldest (3.6 billion years) bedrock outcrops on Earth. The valley's rock outcrops harbor unusual plants adapted to droughty, shallow soils — such as the Great Plains prickly pear cactus (Opuntia macrorhiza)— as well as water hyssop (Bacopa rotundifolia) and a dozen other rare species that inhabit ephemeral pools that form in depressions in the bedrock after rain. These outcrop communities benefit from management with fire, and in recent years have faced increasing pressure from bedrock mining.

MCBS data on rock outcrop communities and other native habitats are being used by Renville County's Division of Environment and Community Development to improve county park management and for review of bedrock mining permits. The data are also being used by trail planning groups in Renville County and Redwood Falls. Knowledge of the location and importance of native habitats and sensitive species is aiding conservation of the valley's unique natural features.

Quarry site featuring equipment.
Gravel mining


rock outcrop.
A granite rock outcrop


Plains prickly pear cactus .
Plains prickly pear
cactus (Opuntia macrorhiza)


a landowner on his prairie.
This landowner visited a small native prairie on his farm with the MCBS plant ecologist. Prairie once covered most of the county; less than 1% remains.