Surface-water nutrient and sediment mappers are now available

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SPARROW mappers are interactive tools that allow users to evaluate streamflow and nutrient and sediment conditions as well as the importance of different sources of contaminants in a selected river basin. Data can be visualized at different scales using maps and interactive graphs and tables.

SPARROW (SPAtially Referenced Regression On Watershed attributes) models estimate the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.  Interactive, online SPARROW mapping tools allow for easy access to explore relations between human activities, natural processes and contaminant transport. The USGS recently published SPARROW streamflow, nutrient, and suspended-sediment models for the five major hydrologic regions of the United States, including the Pacific region (which consists of the Columbia River basin, the Puget Sound basin, the coastal drainages of Washington, Oregon, and California, and the Central Valley of California). The SPARROW mappers for the Pacific region can be accessed through the "Data and Tools" tab below. A report describing the development of the Pacific region SPARROW models can be obtained from the "Publications" tab below. In addition to presenting the model predictions, the report describes the geo-spatial data sets that were evaluated during model development. These data sets are publicly available and represent nutrient sources such as agricultural fertilizer, livestock manure, atmospheric nitrogen deposition, natural phosphorus in soil, permitted wastewater discharge, and septic systems.

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Date published: June 9, 2020

SPARROW Mappers for the 2012 SPARROW Models for the Pacific region

SPARROW mappers are interactive tools that allow users to explore river streamflow and nutrient and sediment loads and yields and the importance of different sources of contaminants in a particular river basin. Data can be visualized using maps and interactive graphs and tables, and rankings can be shown by state, major watershed, hydrologic unit (HUC), and catchment.

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Date published: March 4, 2019

SPARROW Modeling Program

SPARROW is a popular watershed modeling technique, distributed by the USGS, that estimates the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.

Attribution: Water Resources