Scientific Investigations Report 2006-5188
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006-5188
Annual Trace-Metal Load Estimates and Flow-Weighted Concentrations of Cadmium,
Lead, and Zinc in the Spokane River Basin, Idaho and Washington, 1999-2004
Prepared in cooperation with the U.S. Environmental Protection Agency
By Mary M. Donato
Table of Contents
Conversion Factors and Datums
Abstract
Introduction
Description of Study Area
Method For Estimating Trace-Metal
Loads
Model Input
Regression Statistics
Estimated Trace-Metal Loads, 1999-2004
Flow-Weighted Concentrations of Trace
Metals, 1999-2004
Estimated Trace-Metal Loads and Flow-Weighted
Concentrations, 1991-2004
Summary
References Cited
Figures
Figure 1. Locations of streamflow-gaging
stations and Bunker Hill Box, including Operable Units 1 and 2, in the Spokane
and Coeur d’Alene River basins, Idaho and Washington.
Figure 2. Locations of streamflow-gaging
stations on and near the South Fork Coeur d’Alene River, Idaho.
Figure 3. Relative locations and hydrologic
relationships among 10 streamflow-gaging stations in the Spokane River basin,
Idaho and Washington.
Figure 4. Relation between trace-metal
concentrations and streamflow at U.S. Geological Survey streamflow-gaging station
12413210, South Fork Coeur d’Alene River at Elizabeth Park, near Kellogg, Idaho,
water years 1999-2004.
Figure 5. Mean annual estimated dissolved
and total trace-metal loads and mean streamflow at 10 streamflow-gaging stations
in the Spokane River basin, Idaho and Washington, water years 1999–2004.
Figure 6. Mean annual flow-weighted
concentrations of trace metals and mean streamflow at 10 streamflow-gaging stations
in the Spokane River basin, Idaho and Washington, water years 1999–2004.
Figure 7. Estimated long-term mean
annual dissolved and total trace-metal loads and mean streamflow at four streamflow-gaging
stations in the Spokane River basin, Idaho.
Figure 8. Mean annual flow-weighted
concentrations of dissolved and total cadmium, lead, and zinc and mean annual
streamflow at four streamflow-gaging stations in the Spokane River basin, Idaho.
Figure 9. Comparison of short- and
long-term trace-metal load estimates at four streamflow-gaging stations in the
Spokane River basin, Idaho.
Figure 10. Estimated flow-weighted
concentration of dissolved and total cadmium and mean annual streamflow at South
Fork Coeur d’Alene River at Pinehurst, water years 1991–2004 and North Fork
Coeur d’Alene River at Enaville, Idaho, water years 1992–2004.
Tables
Table 1. Streamflow-gaging stations
in the Spokane River basin, Idaho and Washington, where streamflow and water-quality
samples were collected to estimate flow-weighted concentrations and cadmium,
lead, and zinc loads, water years 1991–2004.
Table 2. Regression coefficients and
coefficients of determination (R2) used to estimate dissolved and total cadmium,
lead, and zinc loads at 10 streamflow-gaging stations in the Spokane River basin,
Idaho and Washington, water years 1999–2004.
Table 3. Estimated mean annual trace-metal
loads for 10 streamflow-gaging stations in the Spokane River basin, Washington
and Idaho, water years 1999–2004.
Table 4. Comparison of trace-metal load
estimates for water years 1999–2001 (this study) with estimates by Clark (2002)
for nine streamflow-gaging stations in the Spokane River basin, Idaho and Washington.
Table 5. Estimated mean annual flow-weighted
concentrations of trace metals for 10 streamflow-gaging stations in the Spokane
River basin, Idaho and Washington, water years 1999–2004.
Table 6. Regression coefficients and
coefficients of determination (R2) for load models used to estimate dissolved
and total cadmium, lead, and zinc loads at four streamflow-gaging stations in
the Spokane River basin, Idaho.
Table 7. Estimated long-term mean annual
trace-metal loads and flow-weighted concentrations of cadmium, lead, and zinc
at four streamflow-gaging stations in the Spokane River basin, Idaho.
Table 8. Comparison of short- and long-term
trace-metal load estimates for four streamflow-gaging stations in the Spokane
River basin, Idaho.
Table 9. Comparison of trend analysis
results for trace-metal loads and flow-weighted concentrations based on the
Mann-Kendall test and LOADEST regression analysis for four streamflow-gaging
stations in the Spokane River basin, Idaho, water years 1991–2004.
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Send questions or comments about this report to the author, Greg Clark, (208) 387-1324.
For more information about USGS activities in Idaho, visit the USGS
Idaho Water Science Center home page.
U.S.
Department of the Interior | U.S. Geological
Survey
