Link to USGS home page.
Publications—Scientific Investigation Reports

Prepared in cooperation with the
Alaska Army National Guard

Baseline Water-Quality Characteristics of the Alaska Army National Guard Stewart River Training Area near Nome, Alaska

U.S. GEOLOGICAL SURVEY
Scientific Investigation Report 2005-5221—ONLINE ONLY

By Josh D. Eash

Abstract

The Alaska Army National Guard Stewart River Training Area is approximately 23 miles north of Nome on the Seward Peninsula in northwest Alaska. The Stewart River Training Area encompasses much of the Stewart River Basin and a small part of the Snake River Basin. Hydrologic, water-quality, and physical-habitat data were collected at seven surface-water sites within the Stewart River Training Area during the summer runoff months (late-May to early-September) in 2004. Two of the sampling sites selected for this study were on the main stem Stewart River, one at the upstream boundary and one at the downstream boundary of the training area. Continuous hydrologic, precipitation, and water temperature data were collected at these two sites throughout the summer of 2004. Three pond sites, along the upper, middle, and lower reaches of the Stewart River within the training area, were each sampled twice during the summer of 2004 for analysis of water-quality constituents. Two tributaries to the Snake River Basin, Goldbottom Creek and North Fork Snake River, within the Stewart River Training Area boundary, also were sampled twice during the summer of 2004.

Water-quality data collected from the Stewart River at the upstream and downstream study sites indicate similar constituent concentrations. Concentrations of most water-quality constituents collected during the summer of 2004 did not exceed standards for drinking water or recreational contact. Analysis of trace-element concentrations in bed sediment samples indicate the threshold effect concentration (below which no adverse effects on organisms is expected) was exceeded for arsenic, chromium, and nickel concentrations at all sample sites within the Stewart River Training Area and cadmium, copper, zinc, and lead concentrations were found to exceed the threshold effect concentration in varying degrees at the sample sites. The probable effect concentration (above which toxic effects on organisms is likely) was exceeded by arsenic concentrations at all sites except the lower pond site. Chromium and nickel concentrations exceeded the probable effect concentration at the upstream Stewart River site and at the North Fork Snake River site.

Table of Contents

Abstract

Introduction

Background

Previous Studies

Purpose and Scope

Acknowledgments

Environmental Setting

Climate

Rainfall - Runoff Characteristics

Water Quality

Methods of Data Collection and Analysis

Results

Specific Conductance

Hydrogen-Ion Activity (pH)

Water Temperature

Dissolved Oxygen

Alkalinity

Turbidity

Cyanide

Dissolved Solids and Major Ions

Trace Elements

Bacteria

Suspended Sediment

Physical Habitat Characteristics of Stewart River

Stewart River 0.1 mile below Boulder Creek mouth near Nome, Upper Stewart River

Stewart River 0.2 mile below Durrant Creek mouth near Nome, Lower Stewart River

Summary and Conclusions

References Cited

Appendixes


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

View the text in PDF (4.4 MB)

Document Accessibility:  Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.


U.S. Department of the Interior, U.S. Geological Survey
Persistent URL:
Page Contact Information: Contact USGS
Last modified: Thursday, December 01 2016, 06:44:32 PM
FirstGov button  Take Pride in America button