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Napa project ties environmental-flow monitoring to groundwater thresholds for steelhead and frogs
Summary
A Stillwater Sciences-led project using the California Environmental Flows Framework (CEF) combined two years of monitoring and modeling in the Napa Valley subbasin to propose site-specific ecological goals and to quantify pumping impacts on summer baseflows.
A monitoring and modeling team applying the California Environmental Flows Framework to the Napa Valley subbasin reported results showing large year-to-year variability in fish counts and preliminary model estimates of pumping impacts on summer baseflow.
Christian Brodrick, geomorphologist at Stillwater Sciences, presented two years of monitoring (2024–2025) from six intensive sites in the Napa system and described how the CEF approach is being used to set ecological goals and inform minimum thresholds in the groundwater sustainability planning context.
Field findings and counts: Brodrick said surveys documented sharp differences between 2024 and 2025. In Sulphur Creek, juvenile steelhead counts were "fewer than 10" in 2024 and "more…
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