JACKSON HOLE, WYOMING,
ENVIRONMENTAL RESTORATION PROJECT
ENVIRONMENTAL ASSESSMENT

TABLE OF CONTENTS

1.0 INTRODUCTION

2.0 PROJECT PURPOSE AND NEED

3.0 EXISTING CONDITION

4.0 FOUR ALTERNATIVES CONSIDERED

4.1 ALTERNATIVE 1--MULTIPLE AREA RESTORATION WITHIN 500-YEAR FLOODPLAIN
4.2 ALTERNATIVE 2--RESTORATION AT 12 AREAS WITHIN 500-YEAR FLOODPLAIN
4.3 ALTERNATIVE 3--RESTORATION AT FOUR AREAS WITHIN 500-YEAR FLOODPLAIN
4.4 ALTERNATIVE 4--NO ACTION

5.0 PREFERRED ALTERNATIVE

5.1 DESCRIPTION OF THE PREFERRED ALTERNATIVE
5.1.1 Gravel Removal
5.1.2 Channel Capacity Excavations
5.1.3 Channel Stabilization Pools
5.1.4 Secondary Channels
5.1.5 Off-Channel Pools
5.1.6 Spur Dikes
5.1.7 Eco Fences
5.1.8 Anchored Root Wad Logs
5.1.9 Rock Grade Control
5.2 MONITORING AND MAINTENANCE
5.2.1 Channel Stabilization Pools
5.2.2 Secondary Channels
5.2.3 Off-Channel Pools
5.2.4 Spur Dikes
5.2.5 Eco Fences

6.0 AFFECTED ENVIRONMENT AND ENVIRONMENTAL CONSEQUENCES

6.1 WATER
6.1.1 Opportunities for Water Flow Regulation Using Jackson Lake
6.1.1.1 Regulation of Peak Flows and Summer Releases
6.1.1.2 Regulation for Minimum Flow Augmentation
6.2 AQUATIC ENVIRONMENT
6.2.1 Fish
6.2.1.1 Cutthroat Trout
6.2.1.2 Other Game Fish Species
6.2.1.3 Non-Game Fish Species
6.2.2 Aquatic Invertebrates
6.2.3 Aquatic Plants and Algae
6.3 TERRESTRIAL ENVIRONMENT
6.3.1 Vegetation
6.3.2 Wildlife
6.3.2.1 Mammals
6.3.2.2 Big Game
6.3.2.3 Other Mammals
6.3.2.4 Birds
6.3.2.4.1 Waterfowl and Water Birds
6.3.2.4.2 Raptors
6.3.2.4.3 Other Birds
6.3.2.5 Reptiles and Amphibians
6.3.2.6 Threatened and Endangered Species
6.3.2.6.1 Bald Eagle
6.3.2.6.2 Peregrine Falcon
6.3.2.6.3 Whooping Crane
6.3.2.6.4 Grizzly Bear
6.3.2.6.5 Gray Wolf
6.4 AIR QUALITY
6.5 LAND USE
6.6 TRANSPORTATION
6.6.1 Area 1 East Access
6.6.2 Area 1 West Access
6.6.3 Area 4 East Access
6.6.4 Area 4 West Access
6.6.5 Area 9 East Access
6.6.6 Area 9 West Access
6.6.7 Area 10 East Access
6.6.8 Area 10 West Access
6.7 SOCIO-ECONOMICS
6.8 RECREATION
6.9 AESTHETICS
6.10 CULTURAL RESOURCES
6.11 CUMULATIVE EFFECTS

7.0 COMPLIANCE WITH ENVIRONMENTAL PROTECTION STATUTES AND REGULATIONS

7.1 FEDERAL STATUTES
7.1.1 National Historic Preservation Act, As Amended; Executive Order 11593,
Protection and Enhancement of the Cultural Environment, May 13, 1971
7.1.2 Clean Air Act, As Amended
7.1.3 Clean Water Act
7.1.4 Fish and Wildlife Coordination Act
7.1.5 Endangered Species Act of 1973, As Amended
7.1.6 The NEPA
7.1.7 Wild and Scenic Rivers Act
7.1.8 Migratory Bird Treaty Act
7.2 EXECUTIVE ORDERS
7.2.1 Executive Order 11988, Floodplain Management, May 24, 1977
7.2.2 Executive Order 11990, Protection of Wetlands, May 24, 1977
7.3 STATE PERMITS
7.4 ADDITIONAL REQUIREMENTS
7.4.1 Noise Standards, 24 CFR 51B
7.4.2 The CEQ Memorandum, August 11, 1990, Analysis of Impacts of Prime
or Unique Agricultural Lands in Implementing NEPA

8.0 COORDINATION

9.0 LITERATURE CITED

10.0 REFERENCES


APPENDIXES

Appendix A - Biological Assessment and Endangered Species Act Species List
Appendix B - Coordination Act Report
Appendix C - Aquatic and Terrestrial Benefits with and without Project by Area
Appendix D - Cultural Resource Concurrence Letter from SHPO
Appendix E - Clean Water Act, Section 404(b)(1) Evaluation


PLATES

Plate 1 Area Locations
Plate 2 Area 1 Plan
Plate 3 Area 4 Plan
Plate 4 Area 9 Plan
Plate 5 Area 10 Plan
Plate 6 Flow Improvements - Details
Plate 7 Anchored Root Wad Logs - Details
Plate 8 Eco Fences
Plate 9 Spur Dike - Details
Plate 10 Area 9 Projected Vegetation Changes


FIGURES

Figure 1-1 Vicinity Map
Figure 6-1 All Four Areas - Fish Habitat Unit Projections
Figure 6-2 Summary of PSS Vegetation Projections
Figure 6-3 Summary of PF Vegetation Projections


TABLES

Table 4-1 Optional Structure Strengths for 15-, 25-, and 50-year Major Flow Events
Table 6-1 Unregulated Flows at Snake River at Jackson-Wilson Bridge
Table 6-2 Square Feet of Pool Habitat Classes
Table 6-3 Partial List of Plant Species Identified by the WYNDD that may Occur Near the Environmental Restoration Project Areas
Table 6-4 Partial List of Wildlife Species Identified by the WYNDD that may Occur Near Environmental Restoration Project Areas
Table 6-5 Priority I, II, and III Wyoming Species as of 1997


PHOTOGRAPHS

Photo 5-1
Photo 5-2
Photo 5-3

area locations

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