SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

Science Center Objects

SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities

We are using the SPARROW model (Spatially Related Regressions On Watershed Attributes) to understand patterns in water-quality across the Pacific Northwest and California by relating those patterns to natural processes and anthropogenic activities. SPARROW is a hybrid statistical and mechanistic model for estimating where contaminants (such as nutrients and suspended sediment) are generated within a watershed and how they are transported to downstream receiving waters. A calibrated SPARROW model can predict water-quality conditions in areas where no water-quality data exists as well as show the relative contribution to in-stream load from different sources and locations within a watershed. We have published total nitrogen and total phosphorus SPARROW models for the Pacific Northwest and California and a suspended sediment SPARROW model for western Oregon and northwestern California.

 

MAPS & DATA

These maps, which reflect the 2002 results from the total nitrogen and total phosphorus SPARROW models for the Pacific Northwest, show which nutrient source contributed the most to the locally generated total nitrogen and total phosphorus load.

This map, which reflects the results from the 2012 suspended sediment SPARROW model for western Oregon and northwestern California, shows the incremental suspended sediment yields generated across the region – where the incremental yields represent locally generated suspended sediment.

These plots, which reflect the 2002 results from the total nitrogen and total phosphorus SPARROW models for the Middle Columbia River Basin, show the contribution from different nutrient sources to the total nitrogen and total phosphorus loads estimated along the lower Yakima River in Washington.

This ASCII file contains the mean annual total nitrogen (TN) and total phosphorus (TP) loads predicted by the USGS SPARROW models developed for the Pacific Northwest and the relative contribution to those loads from different up-stream sources.

These nutrient predictions can be joined to the NHDPlus Version 2 hydrographic network (using the unique COMID values in the ASCII files), allowing users to perform additional analysis and create their own map products.

 

This ASCII file contains the mean annual suspended sediment loads predicted by the USGS SPARROW model developed for western Oregon and northwestern California and the relative contribution to those loads from different types of up-stream lithology.

These suspended sediment predictions can be joined to the NHDPlus Version 2 hydrographic network (using the unique COMID values in the ASCII files), allowing users to perform additional analysis and create their own map products.

 

These maps, charts, and tables show the amount of total nitrogen and total phosphorus delivered to Pacific Coast estuaries and the contribution from upstream sources to those loads. The results come from the USGS SPARROW models developed for the Pacific Northwest and California.