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Water Quality of Boulder Creek, Colorado

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Water Quality of Boulder Creek, Colorado State of the Watershed: Water Quality of Boulder Creek, Colorado By Sheila F. Murphy Prepared in cooperation with the City of Boulder, Colorado U.S. Geological Survey Circular 1284 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey P. Patrick Leahy, Acting Director U.S. Geological Survey, Reston, Virginia: 2006 For sale by U.S. Geological Survey, Information Services Box 25286, Denver Federal Center Denver, CO 80225 For more information about the USGS and its products: Telephone: 1-888-ASK-USGS World Wide Web: http://www.usgs.gov/ Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, it contains copyrighted materials that are noted in the text. Permission to reproduce those items must be secured from the individual copyright owners. Library of Congress Cataloging-in-Publication Data Murphy, Sheila F. State of the watershed : water quality of Boulder Creek, Colorado / by Sheila Murphy. p. cm. –(USGS Circular ; 1284) Includes bibliographic references. 1. Water quality -- Colorado -- Boulder Creek Watershed (Boulder and Weld Counties). I. Title. II. U.S. Geological Survey circular ; 1284. TD224.C7M87 2006 363. 739’420978863—dc22 2005035604 ISBN 1-411-30954-5 iii Contents Welcome to the Boulder Creek Watershed ..............................................................................................1 Environmental Setting ...................................................................................................................................2 Hydrology ........................................................................................................................................................6 How does water management affect the flow of Boulder Creek? ........................................................8 How clean is the water in Boulder Creek? ................................................................................................9 Water Quality of Boulder Creek from Top to Bottom..............................................................................12 What fish species live in Boulder Creek? ................................................................................................20 What is the quality of ground water in the Boulder Creek Watershed? .............................................21 What was the quality of water in the Boulder Creek Watershed in the past? ..................................22 Timeline for the Boulder Creek Watershed .............................................................................................27 How does water quality in the Boulder Creek Watershed compare to other Front Range watersheds and to watersheds nationwide? .....................................................28 What will be the water-quality issues in the Boulder Creek Watershed in the future? ..................29 Summary........................................................................................................................................................30 References ....................................................................................................................................................31 Acknowledgments .......................................................................................................................................34 For more information ...................................................................................................................................34 Welcome to the Boulder Creek Watershed The Boulder Creek Watershed is approximately 1,160 square kilometers (447 square miles) in area and is located in the Front Range of the Colorado Rocky Mountains, east of the Continental Divide. The watershed includes all the land area that drains water into Boulder Creek. The watershed has great variation in geology, climate, and land cover. Tributaries of Boulder Creek include North, Middle, and South Boulder Creeks, Fourmile Creek, Coal Creek, and Rock Creek, along with several smaller streams. These streams generally flow from west to east. Boulder Creek empties into Saint Vrain Creek, which empties into the South Platte River. The water in Boulder Creek eventually reaches the Mississippi River and the Gulf of Mexico. The communities of Boulder, Louisville, Lafayette, Erie, Superior, and Nederland are in the watershed, along with parts of Arvada, Broomfield, and Frederick. In 2000, about 185,000 people lived in the Boulder Creek Watershed (U.S. Census Bureau, 2001). A reliable source of high-quality water is important for drinking-water supply, recreation, aquatic life, and agriculture. In the semiarid environment of the Colorado Front Range, water resources are limited, and waterways are subject to stress by com- peting uses. The population of the five largest communities in the watershed (Boulder, Lafayette, Louisville, Superior, and Erie) grew by 36 percent from 1990 to 2000, increasing demands on water resources. This report, prepared by the U.S. Geological Survey in cooperation with the City of Boulder, presents the state of water quality in the Boulder Creek Watershed in 2005 and how it has changed over the past 160 years, and identifies potential future water-quality concerns. Frederick Panama Res # 1 City of Boulder protected 52 watershed . O t Ridge property r Cr CO Niwo de C oul B LD Co DER mo Fourmile Cr C £287 Erie WE r Valmont ¤ Boulder BOUL Lakewood Cr Res 7 72 . No Cr oulder r Res 119 B rt r Cr Baseline Lafayette C h de - oul D Indian Peaks B Cr Res oal r MOUNTAINS PLAINS C CO de de Wilderness FIEL vi Boul 36 Area Nederland r BROOM Di Louisville Barker de" Marshall ddle Mi oul Marshall Res Gross B Sout Lake BOULDER CO Res h " Superior l Eldorado GILPIN CO r ta r C Broomfield Boulde Cr BOULDER CO Springs ck en h Ro in Sout JEFFERSON CO 119 C 93 ont oal C Cr Arvada N 0 10 KILOMETERS Boulder Creek Watershed (from Murphy and others, 2003) Lodge k pol Cree Crow e Lone ver WYOMING NEBRASKA Ri Tr Cr e e COLORADO Platt e e e k Cache La Pou Cr e d e h re k R Sout Thompso Big n R St rainCr k 0 40 KILOMETERS V e k e e e Cr Cr r Cr Cr Boulder Creek ulde jou Bo er a Bi av Watershed Clear Cr w ar Cr Be Be C Kio Pl h Nor e um rry th Fork R Cr Cr e att South Pl Mississippi River Watershed South Platte River Watershed 2 State of the Watershed: Water Quality of Boulder Creek, Colorado Environmental Setting The Boulder Creek Watershed lies within two physiographic provinces. The mountainous upper watershed is part of the Southern Rocky Mountains Province and is characterized by deep, steeply sloping valleys. The flatter, lower watershed is part of the Colorado Piedmont Section of the Great Plains Province and slopes gently to the northeast. The two regions differ substan- tially in geology, climate, and land cover. Near the Continental Divide Urban corridor Agricultural reach of Boulder Creek Physiography Elevations in the watershed range from 4,120 meters Creek. The great variation in topography produces five distinct (13,520 feet) at the Continental Divide to 1,480 meters (4,860 climatic/ecological zones: alpine, subalpine, montane, foot- feet) at the confluence of Boulder Creek and Saint Vrain hills, and plains. EXPLANATION Southern Rocky Great Plains ELEVATION CLIMATIC Mountains Province Province (METERS) ZONE 3,500 - 4,200 ALPINE 2,700 - 3,500 SUBALPINE 2,400 - 2,700 MONTANE MOUNTAINS PLAINS 1,800 - 2,400 FOOTHILLS 1,450 - 1,800 PLAINS N 0 10 KILOMETERS Elevation and climatic/ecological zones (data from U.S. Geological Survey, 2005a; a few mesas are included in the plains climatic/ecological zones despite higher elevations). Environmental Setting 3 Climate Temperatures vary widely across the climatic/ecological as snow in the mountains during winter and spring. Melting of zones of the watershed; generally, temperature increases and snow produces high flows in Boulder Creek and its tributaries the difference between minimum and maximum temperatures in spring and summer. increases with decreasing elevation. Most precipitation falls EXPLANATION ANNUAL PRECIPITATION (MILLIMETERS) 1,000-1,100 900-1,000 800-900 MOUNTAINS PLAINS 700-800 600-700 500-600 400-500 300-400 N 0 10 KILOMETERS Estimated average annual precipitation (based on a model from Daly and others, 1994 for 16-square-kilometer grid cells). Air temperatures in the alpine and plains in 2000 (data from Niwot Ridge Long-Term Ecological Research Program, 2002, and National Oceanic and Atmospheric Administration, 2002). 4 State of the Watershed: Water Quality of Boulder Creek, Colorado Geology The upper watershed is underlain by 1.4–1.8 billion- 70 million years ago caused steeply dipping rock layers at year-old metamorphic and granitic bedrock, with deposits of the edge of the mountain front. Ridges and valleys reflect gold, silver, tungsten, and other metals that were emplaced subsequent erosional processes. Metal and coal mining 30–60 million years ago. The lower watershed is underlain by fueled settlement of the watershed in the 1860s. Today, sand 65–300 million-year-old sedimentary rocks, including shale, and gravel is mined along Boulder Creek, and oil and natural sandstone, limestone, and coal-bearing deposits (Murphy and gas are extracted in the eastern part of the watershed. others, 2003). Mountain-building events that occurred about EXPLANATION GEOLOGY QUATERNARY ALLUVIUM TERTIARY VOLCANIC TERTIARY SEDIMENTARY
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