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Data-Collection Methods for Total Dissolved Gases Monitoring, Youghiogheny River at Dam Outlet Tunnel Near Confluence, Pennsylvania

Open-File Report 2026-1068
Prepared in cooperation with the U.S. Army Corps of Engineers Pittsburgh District
By: , , and 
https://doi.org/10.3133/ofr20261068

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Abstract

Supersaturation of total dissolved gases (TDG) can potentially occur in the tailrace water at the Youghiogheny River at dam outlet tunnel near Confluence, Pennsylvania (U.S. Geological Survey [USGS] streamgaging and monitoring station 03077100). The USGS, in cooperation with the U.S. Army Corps of Engineers, established methods to collect and report TDG saturation data in the tailrace below the Youghiogheny Dam. Monitoring and TDG data collection started in June 2008 and continues currently (2025). Data are collected from June 1 through November 30 of each year, and these data are used by the U.S. Army Corps of Engineers to guide management of the dam outflow. Methods used for data collection, processing, reporting, and quality assurance for TDG monitored at USGS station 03077100 are presented in this report. The TDG data are publicly available in the USGS National Water Information System database.

Plain Language Summary

The U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers, established methods to collect and report total dissolved gases (TDG) saturation data in the tailrace (a channel or pool below a dam where water from the dam is discharged) of the Youghiogheny Dam. Monitoring and TDG data collection started in June 2008 and continues currently (2025). Methods used for data collection, processing, reporting, and quality assurance for TDG monitored at U.S. Geological Survey station 03077100 are presented in this report.

Suggested Citation

Ruddy, A.J., Woodward, E.E., and Casile, G.C., 2026, Data-collection methods for total dissolved gases monitoring, Youghiogheny River at Dam Outlet Tunnel near Confluence, Pennsylvania: U.S. Geological Survey Open-File Report 2026–1068, 14 p., https://doi.org/10.3133/ofr20261068.

ISSN: 2331-1258 (online)

Table of Contents

  • Abstract
  • Plain Language Summary
  • Introduction
  • Purpose and Scope
  • Overview of Total Dissolved Gas
  • Methods of Data Collection
  • Summary
  • Acknowledgments
  • References Cited
  • Appendix 1. U.S. Geological Survey Pennsylvania Water Science Center Total Dissolved Gas Pre-Deployment Form
  • Appendix 2. U.S. Geological Survey Pennsylvania Water Science Center Total Dissolved Gas Field and Post-Deployment Form
Publication type Report
Publication Subtype USGS Numbered Series
Title Data-collection methods for total dissolved gases monitoring, Youghiogheny River at Dam Outlet Tunnel near Confluence, Pennsylvania
Series title Open-File Report
Series number 2026-1068
DOI 10.3133/ofr20261068
Publication Date March 27, 2026
Year Published 2026
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Pennsylvania Water Science Center
Description Report: v, 14 p.; Dataset
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Additional publication details