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Loudoun County Baseline Biological Monitoring Survey (2004 – 2006) - Phase II: Clarks Run, Catoctin Creek, Quarter Branch, Dutchman Creek and Piney Run Conditions

Publication Date: 10/1/2006
Publication Number: 20067295

Under Phase II of a proposed multi-phased study, Clarks Run, Catoctin Creek, Quarter Branch, Dutchman Creek and Piney Run were surveyed to systematically evaluate existing physical, chemical and biological stream quality conditions. Using COG’s Rapid Stream Assessment Technique (RSAT), 16 strategically located and representative mainstem and tributary sites (totaling approximately five stream miles) were surveyed between October 2005 and April 2006. This report presents the findings of the RSAT survey, and provides valuable baseline data for assessing general stream conditions in the five preceding watersheds.

In addition, COG staff analyzed existing riparian buffer conditions under 35, 50, 100, and 200 foot width scenarios (on both sides of the stream) for the Catoctin Creek watershed. Using the Loudoun County stream geodata file and year 2005 Spot 5 satellite imagery within the ArcGIS platform, riparian buffer conditions were additionally classified into two generic forest and non-forest categories.

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Loudoun County Baseline Biological Monitoring Survey (2004 – 2006) - Phase II (3 MB PDF)

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