In this wetland type, the channel contains flowing water  for only a portion of the year. When not flowing, the water may remain in isolated pools, or surface water may be absent.

The substrate consists of organic deposits, sand, gravel, cobble, rubble, bedrock, or pioneering plants. There are generally no named soils in this community, although some areas may be listed as mixed alluvial land.

Vegetation is dependent on the length of inundation, as well as the substrate type. In many cases, streambeds are not vegetated because of the scouring effect of the moving water, but occasionally "pioneering" annuals or perennials may colonize the area during low flow. Many small drainage ditches are included with this type.


*Used throughout the community descriptions to indicate the most commonly occurring code in Illinois