The Flat Rocks feature at the confluence with Santa Rosa Creek was an important element of the prehistoric Pomo village at this site and is currently a picturesque protected area for trail hikers to enjoy.
 Immediately above the confluence is a modified channel that was designed to allow encroachment by residential development.
 The open channel has an obvious geometric form where banks have been steepened from the natural original contours; nevertheless, there is considerable riparian vegetation of Arroyo willow and Broad-leaf cattail (Typha latifolia).
 Chief native trees along the banks are Coast live oak (Quercus agrifolia) and Garry oak (Quercus garryana).

Low flows at the end of summer amount to no more than a few cubic feet (50-100 liters) per second; however, after one of the first rains of autumn of approximately 1 in (3 cm), the flow increases to about 120 cu ft (3 m³) per second.
 Substantial energy dissipation is achieved by the willows and cattails that choke the creek in this reach.
 The sides are partially armored with asphalt to achieve stabilization of the unnatural slope and to minimize scouring and erosion.
 In this reach of Brush Creek, Ducker Creek joins from the east and a west fork of Brush Creek forms a confluence somewhat higher from the west.

Soils comprising the streambed of upper and lower reaches are classified as the riverwash series in the U.S. Soil Conservation Service Classification System.
 These materials according to the U.S. Department of Agriculture, consist of very recent deposition of gravel and silt alluvium along streams.
 Layering of soils and gravels brought in from higher elevations has resulted to form the streambed.
The Flat Rocks feature at the confluence with Santa Rosa Creek was an important element of the prehistoric Pomo village at this site and is currently a picturesque protected area for trail hikers to enjoy.  Immediately above the confluence is a modified channel that was designed to allow encroachment by residential development.  The open channel has an obvious geometric form where banks have been steepened from the natural original contours; nevertheless, there is considerable riparian vegetation of Arroyo willow and Broad-leaf cattail (Typha latifolia).  Chief native trees along the banks are Coast live oak (Quercus agrifolia) and Garry oak (Quercus garryana).
Low flows at the end of summer amount to no more than a few cubic feet (50-100 liters) per second; however, after one of the first rains of autumn of approximately 1 in (3 cm), the flow increases to about 120 cu ft (3 m³) per second.  Substantial energy dissipation is achieved by the willows and cattails that choke the creek in this reach.  The sides are partially armored with asphalt to achieve stabilization of the unnatural slope and to minimize scouring and erosion.  In this reach of Brush Creek, Ducker Creek joins from the east and a west fork of Brush Creek forms a confluence somewhat higher from the west.
Soils comprising the streambed of upper and lower reaches are classified as the riverwash series in the U.S. Soil Conservation Service Classification System.  These materials according to the U.S. Department of Agriculture, consist of very recent deposition of gravel and silt alluvium along streams.  Layering of soils and gravels brought in from higher elevations has resulted to form the streambed.
Brush Creek (Sonoma County, California)