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Nehalem River Basin: Technical Assistance for Watershed Data Synthesis, Restoration, and Outreach Priorities. 4/16/2008. Goal. Support Council’s outreach campaign to recruit landowners for participation in habitat restoration projects. Tasks. Data Synthesis.

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Nehalem River Basin:Technical Assistance for Watershed Data Synthesis, Restoration, and Outreach Priorities

4/16/2008

slide2
Goal
  • Support Council’s outreach campaign to recruit landowners for participation in habitat restoration projects
data synthesis
Data Synthesis

TIER I: Robust Data and Spatially Extensive

  • Coho distribution & Intrinsic Potential
  • ODFW/Boswell Aquatic Habitat Inventory

TIER II: Supporting Data (less robust/extensive)

  • DEQ 303 (d) list for temperature and e-coli
  • FLIR (water temperature)
  • PSU Riparian/LWD/shade analyses
  • DEQ Macroinvertebrate data
  • ODFW/OWRD flow restoration priorities
  • Tidal wetland restoration priorities – Greenpoint Consulting
data synthesis1
Data Synthesis

TIER III: Supplemental Information

  • OWEB completed aquatic / riparian restoration projects
  • Turbidity data (UNWC/DEQ)
  • Summarize hydrograph (flood history; low flows)

ADDITIONAL: Information to Support the Map Products

  • Geology
  • Aerial photography
aquatic habitat inventories
Aquatic Habitat Inventories
  • ODFW ~360 reaches surveyed (1990-2004)
  • Boswell Consultants ~ 430 reaches surveyed (2002-2007)
  • Data used to prioritize reaches for:
    • LWD placement
    • Riparian enhancement
    • Passage barrier removal
aquatic habitat inventories1
Aquatic Habitat Inventories
  • Large wood placement priority
    • Coho present
    • Unconstrained valley bottom (VWI >2)
    • Channel width small enough for wood to stay in place after floods (ACW < 12 meters)
    • Currently lacks LWD (<2.0 Key pieces/100m)
aquatic habitat inventories3
Aquatic Habitat Inventories
  • Riparian enhancement priority
    • Riparian vegetation dominated by hardwoods, shrubs, or grass
    • Low shade cover (< 70%)
    • Conifers not well established in riparian zone
    • Current land use would allow riparian enhancement
aquatic habitat inventories5
Aquatic Habitat Inventories
  • Artificial Fish Passage Barriers priority
    • Low gradient streams
    • Gradient of the reach made accessible
    • Area of land drained
    • Fish presence below culvert
    • Estimated cost of culvert replacement.
odeq 303 d list fecal coliform all delisted tmdl approved
ODEQ303(d)list: FecalColiform(All delisted; TMDL approved)

Criteria: Fecal coliform median of 14 organisms per 100 ml; no more than 10% > 43 organisms per 100 ml

psu riparian lwd shade analyses
PSU Riparian/LWD/shade analyses
  • 1999 Watershed Analysis
  • Used draft OWEB methods
  • Supplemental material using final OWEB methods?
deq macroinvertebrate data
DEQ Macroinvertebrate data
  • Samples collected 1998 – 2004
  • DEQ evaluated aquatic community relative to temperature and fine sediment, summarized each year as 1) Impaired or 2) Equivalent to Reference Condition.
  • Results mapped as:
    • GREEN: Not Impaired
    • YELLOW: Intermediate in evaluation.
    • RED: Impaired.
    • ROSE: Flagged as outside the predictive model
low flows
Low flows

ISWR @ gage 14301000, Nehalem River near Foss:

  • Priority Date: 5/9/1973
  • 7/1 – 9/30 rate = 90 cfs

ISWR @ gage 14299800, Nehalem R. near Vernonia:

  • Priority Date: 5/9/1973
  • 7/1 – 9/30 rate = 5 cfs
geology
Geology

Volcanics / Intrusives:

  • Higher gradient, highly bisected drainage network
  • Larger substrate (pebbles and boulders) and fewer pools.

Sedimentary:

  • Lower gradient, more secondary channels
  • Sandy substrate, pool rich.
proposed 6 th field subwatershed summaries
Proposed 6th-field subwatershed summaries:
  • Coho distribution & Intrinsic potential
  • LWD & Riparian priorities
  • 303 (d) listed reaches
  • Barriers
  • Completed restoration projects
  • Landownership
  • Orthophotos as base map
slide37

Questions for TAC:

  • Sixth field watershed maps & summaries
  • Prioritization approach (based on summaries)
  • Deliverables:
    • Sixth-field maps (hardcopies)
    • Habitat survey summaries
    • GIS data for all Tier 1-4 data
    • Web-based tool for downloading digital data