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Scientific Investigations Report 2008–5027

**U.S. GEOLOGICAL SURVEY  Scientific Investigations Report 2008–5027**

# Pesticide Occurrence and Distribution in the Lower Clackamas River Basin, Oregon, 2000–2005

**Prepared in cooperation with the Clackamas Watershed Management Group (Clackamas River Water Providers and Clackamas County Water Environment Services) and the National Water-Quality Assessment Program  By Kurt D. Carpenter, Steven Sobieszczyk, Andrew J. Arnsberg, and Frank A. Rinella**

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## Table of Contents

Foreword

Conversion Factors, Datum, and Abbreviations and Acronyms

Abstract

Introduction

Methods

Results

Discussion

Summary

Acknowledgments

References Cited

Glossary 

## Figures

Figure 1. Locations of sampling sites in the lower Clackamas River basin, Oregon, 2000–2005.

Figure 2. Distribution of data-collection activities and streamflow and turbidity conditions in the lower Clackamas River at Oregon City, Oregon, 2002–2005. 

Figure 3. Streamflow and turbidity conditions in the lower Clackamas River at Oregon City, Oregon (USGS continuous water-quality monitor and streamflow-gaging station 14211010), during the May and September 2005 storm event samplings.

Figure 4. Daily and hourly precipitation at the Holgate Road rain gage and distribution of storm samples collected in the lower Clackamas River basin, Oregon, 2000–2005.

Figure 5. Patterns in streamflow and water yield, pesticide numbers and total concentrations, and instantaneous pesticide load and yields during two storm event samplings in the lower Clackamas River basin, Oregon, May and September 2005.

Figure 6. Percentage of total pesticide concentration from the common herbicide products RoundUPTM (glyphosate and its degradate AMPA) and CrossbowTM (2,4–D and triclopyr), fungicides, and insecticides for storm samples collected from tributaries, May and September 2005.

Figure 7. Number of pesticide compounds detected in samples collected from the lower Clackamas River basin tributaries and in source and finished drinking water from the study water-treatment plant on the lower Clackamas River, Oregon, 2000–2005.

Figure 8. Maximum concentrations of herbicides, insecticides, and fungicides detected in samples collected from the lower Clackamas River basin, Oregon, 2000–2005.

Figure 9. Number, total concentration, and total instantaneous load of pesticides for samples collected during the EUSE urbanization study from three streams in the Deep Creek basin, Oregon, 2003–2004.

Figure 10. Total number of pesticides detected and total pesticide concentrations for storm and nonstorm samples of source water collected from the study water-treatment plant on the lower Clackamas River, Oregon, 2002–2005.

Figure 11. Total pesticide concentrations in source and finished drinking water samples collected from the study water-treatment plant on the lower Clackamas River, Oregon, 2002–2005. 

Figure 12. Number of pesticides detected and total pesticide concentrations in source and finished drinking water samples collected from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005. 

Figure 13. Highest Pesticide Toxicity Index values for benthic invertebrates and fish for samples collected from the lower Clackamas River basin tributaries, Oregon, 2000–2005.

Figure 14. Maximum benchmark quotients for pesticide concentrations in finished drinking-water samples from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005. 

Figure 15. Diazinon concentrations in source water samples collected from the study drinking-water treatment plant on the lower Clackamas River, Oregon, and in the lower-basin tributaries, 2000–2005

## Tables

Table 1. Sites sampled for pesticides in the lower Clackamas River basin, Oregon, 2000–2005.

Table 2. Pesticide data-collection activities in the lower Clackamas River basin, Oregon, 2000–2005.

Table 3. Pesticide compounds detected in the lower Clackamas River basin, Oregon, 2000–2005.

Table 4. Pesticide concentrations in source and finished drinking water from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005.

Table 5. Potential effect of powdered activated carbon on concentrations of pesticides and degradates in finished water samples collected from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005. 

Table 6. Aquatic-life benchmarks for pesticides and degradates detected in the lower Clackamas River basin, Oregon, 2000–2005.

Table 7. Pesticide Toxicity Index values for benthic invertebrates and fish for stormwater samples collected in the lower Clackamas River basin, May and September 2005.

Table 8. Maximum benchmark quotients for pesticide concentrations in finished drinking-water samples from the study water-treatment plant on the lower Clackamas River, Oregon, 2004–2005.

Table 9. Potential human-health effects of select pesticides detected in the lower Clackamas River basin, Oregon, 2000–2005.

Table 10. Potential uses for pesticides detected in the lower Clackamas River basin, Oregon, 2000–2005.

This report is available online in Portable Document Format (PDF). If you do not  have the **Adobe Reader**, it is available for free download from Adobe Systems Incorporated.

####  Download the report (PDF, 5 MB) 

####  Download Appendixes A-E (PDF, 3 MB) 

####  Download Plate 1 (PDF, 4.4 MB) 

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Send questions or comments about this report to the author, **K.D. Carpenter**, (503) 251-3215.

For more information about USGS activities in Oregon, visit the **USGS Oregon Water Science Center home page**.

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U.S. Department of the Interior | U.S. Geological Survey  URL: http://pubs.usgs.gov/sir/2008/5027  Page Contact Information: Publications TeamPage Last Modified: Thursday, 10-Jan-2013 18:43:01 EST