Napa County Baseline Data Report



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DRAFT

Biological Resources of Napa County

Napa County Baseline Data Report




Prepared for:




Napa County

Conservation, Development, and Planning Department

1195 Third Street, Suite 210
Napa, CA 94559

Contact: Will Selleck







Prepared by:




Jones & Stokes

268 Grand Avenue

Oakland, CA 94610-4724

Contact: Ken Schwarz

510/433-8962 ext. 8969











December 2004




Jones & Stokes. 2004. Draft Biological Resources of Napa County. Napa County Baseline Data Report. December. (J&S 03559.03) Oakland, CA.



Contents


Page

Contents i

Tables iii

Figures iv

Appendices vi

Biological Resources Technical Report 1

Introduction 1

Purpose 1

Specialized Terms Used 1

Executive Summary 3

Regulatory Setting 4

Federal Policies and Regulations 4

State Policies and Regulations 7

Methodology 10

Study Area 10

Mapping 11

Regional Context 17

Biotic Communities 18

Sensitive Biotic Communities 18

Community Descriptions 20

Special-Status Species 52

Definition of Special-Status Species 53

Special-Status Plants 54

Special-Status Wildlife 55

Wildlife Movement Areas 57

Importance of Movement Areas 57

Types of Movement Areas and Movement Behaviors 57

Movement Requirements 58

Movement by Birds and Bats 59

Potential Wildlife Movement areas in Napa County 59

Conclusions 63

Evaluation Areas 63

Important Biological Areas 75

Recommendations 84

Biodiversity Protection 84

Biological Database 84

References 85





Tables

7-1. Biotic Communities of Napa County



    1. Manual of California Vegetation Classification Hierarchy

7-3. Movement Costs of Land Covers/Biotic Communities

    1. Distribution of Biotic Communities Across the County’s 13 Evaluation

Areas

    1. Distribution of Sensitive Communities Across the County’s 13 Evaluation

Areas

7-6. Special-Status Plant Species Potentially Occurring in Napa County

7-7. Special-Status Wildlife Species Potentially Occurring in Napa County


    1. Special-Status Fish Species Potentially Occurring in Napa County

7-9. Associations Between Special-Status Species and Biotic Communities

7-10. Special-status Animal Species in Napa County and California by Group

7-11. CalWild Linkages

Figures


Figure 7-1. Map of 13 evaluation areas

Figure 7-2. Napa County Biological Database

Figure 7-3. Land cover of Napa County

Figure 7-4. Grassland in Napa County

Figure 7-5. Chaparral/scrub in Napa County

Figure 7-6. Oak woodland in Napa County

Figure 7-7. Riparian woodland in Napa County

Figure 7-8. Coniferous forests in Napa County

Figure 7-9. Wetlands in Napa County

Figure 7-10. Streams and reservoirs in Napa County

Figure 7-11. Agriculture in Napa County

Figure 7-12. Special Status Plant Occurrences in Napa County

Figure 7-13. Special Status Plant Occurrences in Pope Valley

Figure 7-14. Special-status Wildlife Occurrences in Napa County

Figure 7-15. Special Status Wildlife Occurrences in Napa Marshes

Figure 7-16. Types of wildlife movement areas (Pending)

Figure 7-18 Wildlife Movement Areas: CalWild Designations

Figure 7-19 Wildlife Movement: Natural Habitat and Impact of Roads

Figure 7-20 Wildlife Movement in Coniferous Forest and Riparian Habitat

Figure 7-21 Wildlife Movement in Oak Woodland and Riparian Habitat

Figure 7-22 Wildlife Movement in Grassland and Riparian Habitat

Figure 7-23 Wildlife Movement, Natural Habitat and Zoning

Figure 7-24 Wildlife Movement: Cost-Weighting of Land Cover Types

Figure 7-25 Wildlife Movement: Example of Least Cost Path Analysis

Figure 7-26. Napa River Marshes

Figure 7-27. Jamieson/American Canyon

Figure 7-28. Carneros

Figure 7-29. Napa Valley Floor

Figure 7-30. Western Mountains

Figure 7-31. Eastern Mountains

Figure 7-32. Angwin

Figure 7-33. Livermore Ranch

Figure 7-34. Southern Interior Valleys

Figure 7-35. Central Interior Valleys

Figure 7-36. Pope Valley

Figure 7-37. Berryessa Area

Figure 7-38. Knoxville Area

Figure 7-39. Important Biological Areas

Figure 7-40. Numbers of Special Status Plant Species By Habitat Type

Figure 7-41. Numbers Of Special Status Plant Species In Napa Marsh Area

Figure 7-42. Numbers Of Special Status Wildlife Species By Habitat Type

Figure 7-43. Numbers Of Special Status Animal Species In Napa Marsh Area

Figure 7-44. Sensitive Communities in Napa County




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