Friday, August 10, 2007 - 8:20 AM

COS 159-2: Post-project assessments of two urban stream restoration projects in northern California

Alison H. Purcell1, Ocean Halbert2, and Vincent H. Resh1. (1) UC Berkeley, (2) The Watershed Project

We conducted post-project assessments of two urban stream restoration projects along Baxter Creek (El Cerritto, California) to examine biological, habitat, and sociological aspects of each. First, the Poinsett Park restoration project (completed in 1997) daylighted a 70-m reach of Baxter Creek, planted native riparian vegetation, and restored step pool characteristics. Biological (benthic macroinvertebrate) and habitat assessments were completed at Poinsett Park in 1999, 2004, 2005, and 2006. Biological results indicated a temporal increase in the percentage of sensitive aquatic organisms collected. Habitat assessments results were similar in 1999, 2004, and 2006 with slight improvements over time because of increased bank stability and decreased sediment deposition. Sociological surveys conducted in the Poinsett Park neighborhood in 1999 and 2004 indicated that residents were pleased with the restored creek site seven years post-restoration. Second, the Baxter Creek Gateway restoration project (completed in 2005) regraded the banks, planted native riparian vegetation, and recreated a meandering channel. Biological and habitat assessments were completed in 2005 (pre-restoration) and 2006 (post-restoration). Biological results showed an improved post-restoration condition according to an index of biotic integrity. Habitat assessment scores generally decreased between 2005 and 2006 because the newly planted riparian vegetation was not yet fully established. Post-restoration sociological surveys showed increased use of the site and a heightened awareness of the creek. Post-project assessments that examine multiple attributes are critical to evaluate the ecological and social success of urban stream restoration projects.

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