SPARROW Surface Water-Quality Modeling for Puget Sound
Project Website: Puget Sound, WA Nutrient SPARROW Model | U.S. Geological Survey (usgs.gov)

Documentation for the Puget Sound SPARROW models
Schmadel, N.M., Figueroa-Kaminsky, C., Wise, D.R., Wasielewski, J.K., Johnson, Z.C., Black, R., 2025, Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020. ESS Open Archive. February 05, 2025. https://doi.org/10.22541/essoar.173878059.92247480/v1

Schmadel, N.M., Figueroa-Kaminsky, C., Wise, D.R., Wasielewski, J.K., Gala, J., Johnson, Z.C., 2024, Model application and calibration load data for seasonally dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Washington waters of the Salish Sea, 2005 through 2020: U.S Geological Survey data release, https://doi.org/10.5066/P9LY1PQF

Documentation of the modeling tool SPARROW (SPAtially Referenced Regression On Watershed attributes)
Schwarz, G.E., A.B. Hoos, R.B. Alexander, and R.A. Smith, 2006. The SPARROW Surface Water-Quality Model: Theory, Application, and User Documentation. U.S. Geological Survey Techniques and Methods Report, Book 6, Chapter B3. https://pubs.usgs.gov/tm/2006/tm6b3/;

Preston, S.D., Alexander, R.B., Woodside, M.D., and Hamilton, P.A., 2009, SPARROW MODELING - Enhancing Understanding of the Nation's Water Quality: U.S. Geological Survey Fact Sheet 2009-3019, 6 p. https://pubs.usgs.gov/fs/2009/3019/

Documentation of the USGS Watershed Boundary Dataset
U.S. Geological Survey. Watershed Boundary Dataset, https://www.usgs.gov/national-hydrography/watershed-boundary-dataset

Noah Schmadel

Hydrologist
nschmadel@usgs.gov
https://www.usgs.gov/staff-profiles/noah-schmadel

Daniel Wise

Hydrologist
dawise@usgs.gov
https://www.usgs.gov/staff-profiles/daniel-r-wise

USGS Oregon Water Science Center

2130 SW 5th Avenue
Portland, OR 97201
https://or.water.usgs.gov/

Mean Aggregated Yield:
The sum of the seasonally averaged incremental loads within a HUC12 watershed divided by the total area of the watershed.

Incremental Load:
The predicted load leaving a stream reach that represents only the contribution from sources located within the incremental drainage area for that reach. The incremental drainage area for a stream is the area that drains directly to a reach without passing through another reach.

Accumulated Load:
The predicted load exported from a HUC12 watershed that represents the contribution from all sources located within the entire area draining to the watershed outlet (which could include other upstream watersheds).

Mean Seasonal Accumulated Load:
The seasonally averaged accumulated load exported from a HUC12 watershed.

Definitions for “Nutrient Impaired Waterbodies” layer:

• Name: Name of impaired water body.
• WBID: Code used by Washington Department of Ecology to identify the nutrient-impaired water body.
• Reach ID: Reach identifier from NHDPlus Version 2.

USGS Data Disclaimer:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.

USGS Software Disclaimer:
This software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.

USGS Product Names Disclaimer:
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

This web application functions best in Chrome, Firefox, Edge, or Safari.

This web application has been made possible by the following open-source projects:
Lobipanel https://github.com/arboshiki/lobipanel
Boostrap Select https://silviomoreto.github.io/bootstrap-select

Version v0.9.0

Link to SPARROW REST Services:
SPARROW Puget Sound REST Services