The US Fish & Wildlife Service, in conjunction with the Kansas Biological Survey and Kansas Parks, Wildlife and Tourism, is supporting the development of a full TerrainWorks Digital Landscape across 7 million acres of the Flint Hills ecoregion in support of aquatic habitat analysis and classification. The Flint Hills areas is one of the last remaining intact "tall grass prairie" ecosystems. The EPA and the World Wildlife Fund have 
designated the Flint Hills as an ecoregion, distinct from other grasslands of the Great Plains. Explorer Zebulon Pike first coined the name of Flint Hills in 1806 and remarked in his journal "passed very ruff flint hills". In addition to the American Bison, fish species include the Arkansas Darter and Shiner, June Sucker, Kendall Warm Springs Dace, and the Pallid Sturgeon; in addition there are over 20 mussel species. The project was completed in December, 2014.
See here for final report and description and use of new stream classification.