Flood of September 18-19, 2004 in the Upper Delaware River Basin, New York

Open-File Report 2005-1166

Prepared in cooperation with the Federal Emergency Management Agency



The interaction between the remnants of tropical depression Ivan and a frontal boundary in the upper Delaware River basin on September 18-19, 2004, produced 4 to more than 6 inches of rainfall over a 5-county area within a 24-hour period. Significant flooding occurred on the East Branch Delaware River and its tributaries, and the main stem of the Delaware River. The resultant flooding damaged more than 100 homes and displaced more than 1,000 people. All of the counties within the basin were declared Federal disaster areas, but flood damage in New York was most pronounced in Delaware, Orange, and Sullivan Counties. Flood damage totaled more than $10 million. Peak water-surface elevations at some study sites in the basin exceeded the 500-year flood elevation as documented in flood-insurance studies by the Federal Emergency Management Agency. Flood peaks at some long-term U.S. Geological Survey (USGS) streamflow-gaging stations were the highest ever recorded.

Suggested Citation

Brooks, L.T., 2005, Flood of September 18-19, 2004, in the Upper Delaware River basin, New York: U.S. Geological Survey Open-File Report 2005–1166, 123 p.,

ISSN: 2331-1258 (online)

Table of Contents

  • Abstract
  • Introduction
  • Rainfall
  • Flood Discharge and Frequency
  • Effects of Reservoirs on Downstream Flooding
  • Peak Water-Surface Elevations at Flood Study Sites
  • Flood Damage
  • Summary
  • Acknowledgments
  • References Cited
  • Appendix

Additional publication details

Publication type:
Publication Subtype:
USGS Numbered Series
Flood of September 18-19, 2004 in the Upper Delaware River Basin, New York
Series title:
Open-File Report
Series number:
Year Published:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
New York Water Science Center
iv, 123 p.
Online Only (Y/N):
Additional Online Files (Y/N):