WSPC12525 ‎(2)‎

• File Number: 8220.101.10
• Description: Colorado River Water Projects - Glen Canyon Dam-Lake Powell - Adaptive Management
• State: CO
• Basin: Colorado Mainstem
• Date: 6/2/1998
• Author: DOI-GCMRC
• Title: Assessment of Impacts of Glen Canyon Dam Operations on Water Quality Resources in Lake Powell and the Colorado River in Grand Canyon - Grand Canyon Monitoring and Research Center - Draft - 06-02-98
• Water Supply Pro - Doc Type: Report/Study

002373

Table of Contents

ACKNOWLEDGMENTS ...................................................... II

ABSTRACT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. IV

LIST OF FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . .. VIII

I. INTRODUCTION ........................................................... 1

A. SCOPE AND OiHECTIVES OF ASSESSMENT ...................................... I

B. PURPOSE OF ASSESSMENT .................................................. 2

C. AFFECTED RESOURCES .................................................... 4

II. BACKGROUND INFORMATION ........................................ ... 5

A. BRIEF HISTORY OF LAKE POWELL AND GLEN CANYON DAM OPERATIONS. . . . . . . . . . . .. 5

B. RECLAMATION MONITORING PROGRAM ....................................... 7

C. DETAILS OF CURRENT MONITORING PROGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9

1. Quarterly Lake Wide Sampling. _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2. Monthly Forebay Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10

3. Tailwater Monitoring. . . . . .' . _ . . . . . . . . . . . . . . . . . - . . . . . - . . . . . . . . . . . . . . . . . .. 10

III. ASSESSMENT PROCESS AND DATA ANAL YSIS ............................ 11

A. DATA SOURCES .................................. - . . .. . . . . . . . . .. . . . .. ... II

1. Lake Powell. . . . . . . _ . . . . . . . . . . . _ . . . . . . . . . . . . . . . . . - . . . . - . . . . . . . . . . . . . . . .. 11

2. Glen Canyon Dam Releases .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 13

B. DATA MANAGEMENT. . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. 15

C. DATA ANALYSIS ........................................................ 15

IV. RESULTS ............................................................... 16

A. LAKE POWELL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. \6

06/02/98

DRAFT

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