page_title: Matanzas Creek
section_title: Ecology
hierarchical_section_title: Matanzas Creek / Ecology
caption_attribution_description: English: Matanzas Creek adjacent to Doyle Park in Santa Rosa, California. Channel has been deepened by 4 to 5 meters at this location to minimize urban flooding. Steep stream banks of Quaternary alluvium are colonized by non-native ivy.
context_page_description: Matanzas Creek is an 11.4-mile-long year-round stream in Sonoma County, California, United States, a tributary of Santa Rosa Creek.
context_section_description: The upper reaches of Matanzas Creek have gradients of five to fifteen percent as the stream cascades down Sonoma Mountain.  Matanzas Creek channel has been deepened 4 to 5 meters to minimize urban flooding where it flows through Quaternary alluvium of the Santa Rosa Plain for approximately 1 mile (2 kilometers) prior to confluence with Santa Rosa Creek.
  In downtown Santa Rosa, the creek passes through a 1,400-foot-long (430 m) culvert designed to allow maximum development of the city; however, this structure has impeded the spawning of anadromous fish in the upper Matanzas Creek.  A proposal was developed for retrofitting the structure with inflatable bladders that will allow fish to scale the fish ladder, while allowing pools to form, thus preventing low flow uniformly shallow depths.
caption: Steep stream banks of Quaternary alluvium are colonized by bay trees and non-native ivy adjacent to Doyle Park.
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