Boulder Creek Vegetation Treatment EA
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Boulder Creek Vegetation Project Environmental Assessment DOI-BLM-ID-C020-2017-0007-EA U.S. Department of the Interior Bureau of Land Management Cottonwood Field Office 2 Butte Drive, Cottonwood, Idaho 83522 October 2018 CONTENTS Introduction ..................................................................................................................................... 3 1.1 Proposal and Background: .................................................................................................... 3 1.2 Purpose and Need ................................................................................................................. 3 1.3 Land Use Plan Conformance ................................................................................................ 3 1.4 Scoping and Public Involvement .......................................................................................... 4 2.0 Proposed Action and Alternatives ............................................................................................ 4 2.1 Alternative A (Proposed Action) .......................................................................................... 4 2.2 Alternative B (Reduced New Roads/Stream Crossings): ..................................................... 6 2.3 Alterative C (Existing Roads Only): ..................................................................................... 6 2.4 Alternative D (No Action Alternative): ................................................................................ 6 2.5 Summary of Action Alternatives: ......................................................................................... 7 3.0 Affected Environment and Environmental Impacts ................................................................. 7 3.1 Scope of Analysis ................................................................................................................. 7 3.2 Forest Vegetation .................................................................................................................. 9 3.3 Fuels .................................................................................................................................... 15 3.4 Soils..................................................................................................................................... 17 3.5 Water Resources ................................................................................................................. 21 3.6 Fisheries, Aquatic Habitats, and Special Status Aquatic Species ....................................... 26 3.7 Wildlife, Habitat, and Special Status Species ..................................................................... 43 3.8 Economic Conditions .......................................................................................................... 59 3.9 Livestock Grazing ............................................................................................................... 60 4.0 Tribes, Individuals, Organizations, or Agencies Consulted ................................................... 61 5.0 List of Preparers ...................................................................................................................... 61 Appendix A: Maps ...................................................................................................................... A-1 Appendix B: References Cited.................................................................................................... B-1 Appendix C: Land Use Plan Conformance ................................................................................. C-1 Appendix D: Project Design Features......................................................................................... D-1 Appendix E: Issues not Analyzed in Detail ................................................................................. E-1 Appendix F: Fisheries, Aquatic Habitats, and Special Status Species ........................................ F-1 Appendix G: BLM Sensitive Wildlife Species ........................................................................... G-1 Boulder Creek Vegetation Project EA (DOI-BLM-ID-C020-2017-0007-EA) 2 Introduction 1.1 Proposal and Background: The BLM proposes to implement a vegetation management project designed to improve forest health and resilience, enhance wildlife habitat, and reduce the potential impact of a wildfire to public lands and adjacent private property. The project area is located approximately 11 air- miles north of New Meadows, Idaho in northern Adams County. (See Appendix A, Map A-1). 1.2 Purpose and Need The purpose of the Boulder Creek Vegetation Project is to address a goal from the Approved Cottonwood Resource Management Plan (RMP) (BLM 2009), which states “Manage forests to maintain or improve forest health, composition, structure, and diversity consistent with site potential, and Historical Range of Variability.” To accomplish this goal, the proposed action would improve forest health and resilience by maintaining or moving current conditions found on the Boulder Creek project area toward the desired future conditions identified in the RMP for forest vegetation through treatments that would: • Promote large tree forest structure, reduce high stand density levels and the associated risk of large scale insect and disease events, favor early seral species composition (for example, ponderosa pine, western larch, and Douglas-fir), and provide economic opportunities to resource dependent communities; • Promote achievement of diverse wildlife habitat conditions by promoting forest structure and spatial arrangements as described in the RMP that favor an array of forest dependent species (for example, create openings, enhance cover and forage, retain large trees, provide security, and maintain/promote desired snag levels); • Reduce the wildfire hazard within and adjacent to the wildland-urban interface (WUI) and increase the resilience of vegetative communities to fire by moving toward more characteristic fire regimes and fuel conditions; • Reduce potential for sediment delivery from identified road segments. The need for this project is based on the departure of current forest stand conditions from desired conditions and goals for watershed quality described in the RMP. These departures include: • A change in the forest structure from an increase of small and medium tree size class and decrease in large tree size classes; • A decrease in early seral species such as western larch and ponderosa pine; • A change toward high canopy cover; • An increase in ground and surface fuels and a decrease in fire resilient species; • Less than desired conditions for watershed function and integrity for Trail Creek and Boulder Creek. 1.3 Land Use Plan Conformance The proposed action would specifically be in conformance with the Forest Vegetation Goal from the Approved Cottonwood RMP, as stated in the Purpose and Need above. The proposed action would also be in conformance with other applicable RMP decisions listed in Appendix C. Boulder Creek Vegetation Project EA (DOI-BLM-ID-C020-2017-0007-EA) 3 1.4 Scoping and Public Involvement The BLM solicited public comments about this proposal from January 3 to February 3 2017. During this time the BLM received two comment submissions. We considered these comments when developing the alternatives described in Section 2.0 and when identifying issues for analysis described in Section 3. 2.0 Proposed Action and Alternatives In addition to the proposed action (Alternative A), the BLM developed two action alternatives: Alternative B (Reduced New Roads/Stream Crossings) and Alternative C (Existing Roads Only). As a baseline for effects analysis, the BLM also considered a No Action Alternative (Alternative D). The proposed action and alternatives are described in detail below. 2.1 Alternative A (Proposed Action) The BLM would implement mechanical treatment on approximately 2,427 acres, prescribed burning on 4,625 acres, and decommission 4.24 miles of road. The mechanical treatments will be divided into three to four separate entries with the first two occurring south of Boulder Creek and the third and possibly fourth occurring north of Boulder Creek. The entry time frames would be spaced two to three years apart due to contract terms and time needed to complete treatment area preparation (i.e. unit layout, tree marking etc.). Prescribed burning would follow these entries. Maps A-2 and A-3 in Appendix A shows the locations of proposed treatments. Actual treatment acres may be less than depicted due to steep slope inclusions, equipment limitations, or other unique features. Mechanical Treatments The BLM would implement four types of mechanical treatments on a total of 2,427 acres (see Table 2.5 in Section 2.5): improvement thinning, non-commercial thinning, even-aged harvest, and uneven-aged harvest. Improvement Thinning – 1,622 acres. Improvement thinning would primarily consist of low thinning often termed “thinning from below” (removing trees from the lower crown), but would also include crown thinning (removing some of the dominant and co-dominant trees) and sanitation cutting to address the spread of insect or disease outbreaks. The objective is to improve the existing stands by retaining the largest diameter classes, promoting fire-resilient stands, and reducing the number of stems, without effort directed at regeneration. The proposed treatments would thin stands by removing diseased and less desirable species such as grand fir (Abies grandis). Emphasis