The aquatic community of a small- to moderate-sized perennial rocky stream typically with a moderate to steep gradient, and cold water that flows over eroded bedrock, boulders, or cobbles in the area where a stream system originates.
The aquatic community of large, quiet, base level sections of streams with a very low gradient.
* probable association but not confirmed.
Conservation:
Global conservation status rank:
G3
Vulnerable globally - At moderate risk of extinction due to rarity or other factors; typically 80 or fewer populations or locations in the world, few individuals, restricted range, few remaining acres (or miles of stream), and/or recent and widespread declines.
State conservation status rank:
SNR
Not Ranked - State conservation status not yet assessed.