Plants At Spinney 
 
Ecologically, the park uplands are dominated by short-grass prairie.  This eco-type is heavily populated with grass species that include blue grama, ring muhly, three awn, western wheatgrass, junegrass and squirreltail. Common wildflowers and small shrubs found here include Indian paintbrush, copper mallow, wallflower, sulfur-flower, locoweed, fringed sagewort, rabbitbrush and snakeweed.

A sparse montane coniferous forest grows on the flanks of Spinney Mountain itself. Ponderosa and limber pine are present with an understory of mountain mahogany, rabbitbrush, currant, blue and sideoats grama, mountain muhly, Arizona fescue, needle-and-thread grass and Spanish bayonet.

Diverse wetland, riparian and aquatic plant communities have become established around the reservoir and below the dam. A plant list of species found at both Spinney and Eleven Mile may be downloaded here.