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Preston Reach Assessment Entiat River

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Preston Reach Assessment Entiat River Preston Reach Assessment Entiat River Chelan County, Washington U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Region Boise, Idaho July 2009 U.S. Department of the Interior Mission Statement The mission of the Department of the Interior is to protect and provide access to our Nation's natural and cultural heritage and honor our trust responsibilities to Tribes and our commitments to island communities. Mission of the Bureau of Reclamation The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Cover Photo: View is to the east looking downstream at a large wood complex along river right. Subreach PR-IZ-4 (Inner Zone) – Entiat Subbasin, Washington – Bureau of Reclamation. Date: August 21, 2008 Photo by: R. McAffee Preston Reach Assessment Entiat River Chelan County, Washington U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Region Boise, Idaho July 2009 Acknowledgements The Bureau of Reclamation (Reclamation) was fortunate to have the support and cooperation of multiple United States (U.S.) Forest Service staff who participated in the effort to produce the Preston Reach Assessment, Entiat River, Chelan County, Washington. In particular, Reclamation acknowledges the collaborative efforts and contributions of U.S. Forest Service employees Phil Archibald and Dave Hopkins with the integration of the Reach-based Ecosystem Indicators (REI) that is the overarching strength of this reach assessment. Reclamation would like to thank the Entiat Habitat subcommitee for their review and contributions to this report. The following Reclamation employees are acknowledged for their peer review of this report: Regional Geologist Richard A. Link, Geology, Exploration & Instrumentation Group, Pacific Northwest (PN) Regional Office and Terril Stevenson, PN Regional Geologist. Acronyms and Definitions Corps Army Corp of Engineers DOE Department of Ecology ESA Endangered Species Act GIS Geographic Information System HUC Hydrologic Unit Code IDT Inter-disciplinary Team IFIM Instream Flow Incremental Methodology ITS Index of Thermal Stress IZ Inner Zone OZ Outer Zone Reclamation Bureau of Reclamation REI Reach-based Ecosystem Indicators RM River Mile RTT Regional Technical Team UCSRB Upper Columbia Salmon Recovery Board U.S. United States USFS U.S. Forest Service VSP Viable Salmonid Population WAT Watershed Action Team WQI Water Quality Index Table of Contents Page Executive Summary............................................................................................................. vii Overview ................................................................................................................................. 1 Purpose and Location............................................................................................................3 Tributary Assessment............................................................................................................8 Reach Characterization....................................................................................................... 10 Reach Condition................................................................................................................... 13 Watershed Condition........................................................................................................... 14 Flow/Hydrology.................................................................................................................... 15 Water Quality....................................................................................................................... 15 Habitat Access ...................................................................................................................... 16 Habitat Quality..................................................................................................................... 16 Channel Dynamics ............................................................................................................... 17 Riparian Vegetation.............................................................................................................17 Discussion.............................................................................................................................. 18 Subreach Unit Profiles......................................................................................................... 28 River Mile 22.45 – 23.10 Subreaches........................................................................ 28 PR-IZ-1 (Inner Zone)................................................................................................. 30 PR-DIZ-1 (Disconnected Inner Zone) ....................................................................... 31 PR-OZ-1 (Outer Zone)............................................................................................... 32 PR-DOZ-2 (Disconnected Outer Zone)..................................................................... 32 PR-OZ-3 (Outer Zone)............................................................................................... 33 PR-OZ-4 (Outer Zone)............................................................................................... 33 River Mile 21.98 – 22.45 Subreaches........................................................................ 34 PR-IZ-2 (Inner Zone)................................................................................................. 36 PR-DIZ-2 (Disconnected Inner Zone) ....................................................................... 37 PR-DOZ-5 (Disconnected Outer Zone)..................................................................... 39 PR-OZ-6 (Outer Zone)............................................................................................... 40 PR-OZ-7 (Outer Zone)............................................................................................... 41 River Mile 21.80 – 21.98 Subreaches........................................................................ 42 PR-IZ-3 (Inner Zone)................................................................................................. 44 PR-DIZ-3 (Disconnected Inner Zone) ....................................................................... 45 July 2009 i Table of Contents (Continued) PR-OZ-7 (Outer Zone)............................................................................................... 47 PR-DOZ-7 (Disconnected Outer Zone)..................................................................... 48 PR-OZ-8 (Outer Zone)............................................................................................... 49 River Mile 21.10 – 21.80 Subreaches........................................................................ 50 PR-IZ-4 (Inner Zone)................................................................................................. 53 PR-OZ-9 (Outer Zone)............................................................................................... 55 PR-OZ-10 (Outer Zone)............................................................................................. 56 Summary and Conclusions.................................................................................................. 57 List of Preparers .................................................................................................................. 59 Literature Cited ................................................................................................................... 61 Glossary ................................................................................................................................ 65 List of Figures Figure 1. Potential habitat actions by subreach and their relative priority of implementation ........................................................................................................x Figure 2. Idealized model showing how assessments and monitoring are hierarchically nested and related. Compiled from Hillman (2006), UCSRB (2007), and Stewart-Oaten and Bence (2001).............................................................................1 Figure 3. Implementation strategy for prioritizing potential habitat actions at the reach scale (adapted from Roni et al. 2005) ......................................................................2 Figure 4. Location map of the tributary assessment area on the Entiat River within the Entiat subbasin.........................................................................................................7 Figure 5. Location of subreaches based on a modified application of the Stream Inventory Handbook (USDA 2008).......................................................................12 Figure 6. Percent of riparian vegetation seral stages based on classifications provided in the Stream Inventory Handbook (USDA 2008) ................................................18 Figure 7. Percent of channel units for each inner zone subreach based on modified classifications from the Stream Inventory Handbook (USDA 2008) ....................20 Figure 8. Channel unit map and two-dimensional hydraulic model velocity map suggest that PR-IZ-1 is predominantly a transport subreach............................... 21 Figure 9. Channel unit map and two-dimensional hydraulic model velocity map suggest that PR-IZ-2 is predominantly a transition subreach and PR-IZ-3 is predominantly a deposition subreach..................................................................
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