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Napa River Basin Limiting Factors Analysis

This study, conducted by Stillwater Sciences, Inc., in June of 2002, represents Phase I of a planned two-phase study. It had three primary objectives:

1. To help inform the Regional Board’s sediment TMDL process;

2. To improve our understanding of current conditions in the Napa River system, develop and refine hypotheses regarding impacts on salmonids and freshwater shrimp populations by sediment and other factors, and develop recommendations for additional (Phase II) studies to define cause-and-effect relationships between human land use activities in the watershed and their impacts on water quality and beneficial uses; and,

3. To make recommendations regarding planning and implementation of restoration actions to protect and restore aquatic ecosystem functions and beneficial uses in the Napa River watershed. These recommendations are based on and commensurate with our current state of knowledge. We anticipate formulating more detailed recommendations once key uncertainties have been resolved during Phase II.