Funding for the Nehalem Watershed Assessment
was provided by a grant through the Governor’s Watershed Enhancement
Board.
Written by: Jill Johnson
Graduate Student
Masters in Environmental
Management Program
Advising and Editing by: Joseph Maser, PhD. Assistant
Professor Environmental Sciences and Resources
Contributors:
Special Thanks to:
Dr. Jon Graves, MERTS, for providing
materials and for providing GIS training for the watershed councils
and to Maggie Peyton, Coordinator for Upper and Lower Nehalem
Watershed Councils, for providing information and support.
List of
Figures
-
Figure 1-1.
Nehalem River Watershed Base Map
-
Figure 1-2.
Landuse and Subwatersheds in the Nehalem River Watershed
-
Figure 1-3. The
Extent of Swiss Needle Cast in 1998
-
Figure 1-4.
The Extent of Swiss Needle Cast in 1999
-
Figure 2-1.
Historic Photograph
-
Figure 2-2.
Historic Timber in the Nehalem Watershed (1914)
-
Figure 3-1.
Stream Size Classifications for the Nehalem River Watershed
-
Figure 3-2.
Channel Confinement Classifications
-
Figure
3-3. Estimated
Response of Channel Habitat Types to Potential Restoration Efforts
-
Figure 4-1.
Nehalem River, Tributaries, and Floodplains
-
Figure 4-2.
Average Annual Precipitation and Stream Gage Locations
-
Figure 4-3.
Annual Peak Flow Summary for the Nehalem River Gaging Station
-
Figure 4-4.
Water Rights in the Nehalem River Watershed
-
Figure 4-5.
State Flow Restoration Priorities for Recovery of Anadromous
Salmonids
-
Figure 5-1.
Riparian Conditions
-
Figure 5-2.
Large Woody Debris Recruitment Potential
-
Figure 5-3.
Shade Provided to Streams by Riparian Buffer
-
Figure 6-1.
Nehalem Road Crossings and Culverts on State and County
Roadways
-
Figure 6-2.
Slope Steepness within the Nehalem River Watershed
-
Figure 6-3.
Roads near Streams in the Nehalem River Watershed
-
Figure 7-1.
Historic and Recent Channel Modification Locations in the
Nehalem River Watershed
-
Figure 8-1.
DEQ 303(d) Listed River Segments and Watershed Council 1998
Temperature Gages.
-
Figure 9-1.
Winter Steelhead Distribution and Critical Habitat
-
Figure 9-2.
Coho Salmon Distribution and Critical Habitat
-
Figure 9-3.
Chum Salmon Distribution and Critical Habitat
-
Figure 9-4.
Spring/Chinook Salmon Distribution and Critical Habitat
-
Figure 9-5.
Fall Chinook Salmon Distribution and Critical Habitat
-
Figure 9-6.
Oregon Department of Fish and Wildlife Habitat Survey Locations
and Oregon Department of
Transportation Culvert Information
-
Figure 10-1. Watershed Condition Summary
List of Tables
-
Table 3-1.
Percentages of Channel Habitat Type Sensitivity Ratings by
Subwatershed
-
Table 4-1.
Monthly Means of Precipitation and Snowmelt at Nehalem, Oregon
for 1969-1998
- Table
4-2. Montly
Means of Precipitation and Snowmelt at Vernonia, Oregon for 1967-1998
-
Table 4-3.
Approximate Proportion of Land Use Types by Subwatershed
-
Table 4-4.
Forest Road Area Summary
-
Table 4-5.
Rural Road Area Summary
-
Table 6-1.
Road Crossing Densities by Subwatershed
-
Table 6-2.
Area of Landslide Hazard Categories by Subwatershed
-
Table 6-3.
Lengths and Densities of Roads within 200 feet of a Stream
-
Table 7-1.
Channel Modification Permit Types
-
Table 8-1.
Beneficial Uses of Water in the Nehalem River Watershed
-
Table 8-2.
Summary of ODEQ Information for the Nehalem River
-
Table 8-3.
Nehalem Water Quality
-
Table 9-1.
Status and Recent Population Trends of Nehalem Basin Anadromous
Salmonids
-
Table 9-2.
Life History Patterns of Anadromous Salmonids in the Nehalem
River Drainage
-
Table 10-1.
Watershed Conditions Summary Matrix
List of Acronyms
-
Channel Habitat Type CHT
-
Cubic Feet per Second
CFS
-
Division of State Lands
DSL
-
Endangered Species Act
ESA
-
Geographical
Informatio
Systems
-
GIS
-
Governor’s
Watershed Enhancement Board GWEB
-
National Marine Fisheries
Service NMFS
-
National Oceanic and
Atmospheric Administration
NOAA
-
National Resources
Conservation Service NRCS
-
Nehalem Valley Historical
Society NVHS
-
Oregon Administrative
RulesOAR
-
Oregon Department of
Environmental QualityODEQ
-
Oregon Department of Fish
and Wildlife ODFW
-
Oregon Department of
Forestry ODF
-
Oregon Department of
Transportation
-
Oregon
Water Resources Department
OWRD
-
River Mile
RM
-
State Service Center for
Geographical Information Systems SSCGIS
-
Tillamook Pioneer
Association TPA
-
Total Maximum Daily Loads
TMDL
-
United States Geological
Survey USGS
-
Water Availability Basin
WAB
-
Western Regional Climate
Center WRCC
Table of Contents
List of Figures and
Tables
Acronyms
1.0
Introduction 1
2.0
Historical
Conditions 8
-
·
Timeline
-
·
Historical Narrative
3.0
Channel
Habitat Types 22
4.0
Hydrology and
Water Use 28
5.0
Riparian
Conditions
50
6.0
Sediment
Sources
63
-
·
Rural Road Instability
-
·
Slope Instability
-
·
Rural Road Runoff
7.0
Channel
Modifications
74
8.0
Water Quality
79
9.0
Fish and Fish
Habitat
85
10.0
Watershed Conditions Summary
109
-
·
Section Summaries
-
·
Data Gaps
-
·
Recommendations
Appendix
Sections
123
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