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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5239

Ground Water Redox Zonation near La Pine, Oregon: Relation to River Position within the Aquifer–Riparian Zone Continuum

Prepared in cooperation with Deschutes County

By Stephen R. Hinkle, David S. Morgan, Leonard L. Orzol, and Danial J. Polette

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Table of Contents

Conversion Factors, Datums, Abbreviations, and Acronyms

Abstract

Introduction

Study Design and Methods

Previous Near-River Redox Work in Study Area

Results

Discussion

Summary

References Cited

Appendix A. Project Quality-Control Data, Historical Near-River Ground-Water Data Collected near the Little Deschutes River Near La Pine, Oregon, and Project Discharge and Chemical Data from the Little Deschutes River near La Pine, Oregon, 2006

Figures

Figure 1. Location of study area near La Pine, Oregon.

Figure 2. Discharge in Deschutes and Little Deschutes Rivers at selected sites near La Pine, Oregon, during calendar year 2006.

Figure 3. Configurations of ground-water transects at Deschutes and Little Deschutes Rivers near La Pine, Oregon.

Figure 4. Relation between chemical constituents in samples from wells at all ground water transects in the Deschutes and Little Deschutes Rivers near La Pine, Oregon, March and October 2006.

Figure 5. Relation between δ¹⁵N and δ¹⁸O of nitrate in samples from wells at ground-water transect LD24.9 (wells containing nitrite-plus-nitrate concentrations greater than 0.5 mg N/L) and sand-filter effluent from septic tanks near La Pine, Oregon.

Tables

Table 1. Ground-water transect site wells and miscellaneous sites near La Pine, Oregon, March and October 2006.

Table 2. Chemical and isotopic data for ground-water transect site wells and miscellaneous sites near La Pine, Oregon, March and October 2006.

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Send questions or comments about this report to the author, S.R. Hinkle, (503) 251-3237.