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Water chemistry - Thornton Creek Restoration Project Effectiveness Monitoring

Published by Northwest Fisheries Science Center | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: December 20, 2025 | Last Modified: 2025-10-07T23:19:44.000+00:00
NOAA has designed and is currently implementing a hyporheic monitoring plan for the Thornton Creek watershed in North Seattle. This work is being conducted for Seattle Public Utilities, who in 2015 completed two large-scale floodplain reconnection projects in the Thornton Creek Watershed. This study will evaluate restoration effectiveness by comparing control and treatment study reaches to each other and to forested references streams before and after restoration. NOAAs data collection focuses on hyporheic invertebrates, water temperature, and nutrient concentrations. Hyporheic and surface water concentrations of DOC, TN, TP, and dissolved nutrients.

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