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• 61. [Article] Lower Columbia Watershed Assessment

  Abstract -- The Lower Columbia Watershed Assessment includes information on watershed historic conditions, channel habitat types, hydrology and water use, riparian/wetlands, sediment sources, channel modification, ...

  Citation × Citation Citation Abstract Copy Title: Lower Columbia Watershed Assessment Abstract -- The Lower Columbia Watershed Assessment includes information on watershed historic conditions, channel habitat types, hydrology and water use, riparian/wetlands, sediment sources, channel modification, water quality, fish and fish habitat, and a watershed condition evaluation. Title: Lower Columbia Watershed Assessment Abstract -- The Lower Columbia Watershed Assessment includes information on watershed historic conditions, channel habitat types, hydrology and water use, riparian/wetlands, sediment sources, channel modification, water quality, fish and fish habitat, and a watershed condition evaluation. Close

• 62. [Article] North Santiam River Watershed Assessment: Lower and Middle Reach Subwatersheds

  Abstract -- This assessment contains topics including historical and reference conditions, hydrology, water use, sediment sources, water quality, fisheries, aquatic and riparian habitats, a watershed condition ...

  Citation × Citation Citation Abstract Copy Title: North Santiam River Watershed Assessment: Lower and Middle Reach Subwatersheds Abstract -- This assessment contains topics including historical and reference conditions, hydrology, water use, sediment sources, water quality, fisheries, aquatic and riparian habitats, a watershed condition summary, future trends, and recommendations. Title: North Santiam River Watershed Assessment: Lower and Middle Reach Subwatersheds Abstract -- This assessment contains topics including historical and reference conditions, hydrology, water use, sediment sources, water quality, fisheries, aquatic and riparian habitats, a watershed condition summary, future trends, and recommendations. Close

• 63. [Article] Lower Rogue Watershed Assessment

  Abstract -- Thank you for your interest in The Lower Rogue Watershed Assessment. The Lower Rogue Watershed Council’s mission is: To help foster, develop and coordinate a basin-wide approach to resource ...

  Citation × Citation Citation Abstract Copy Title: Lower Rogue Watershed Assessment Abstract -- Thank you for your interest in The Lower Rogue Watershed Assessment. The Lower Rogue Watershed Council’s mission is: To help foster, develop and coordinate a basin-wide approach to resource planning and management so as to protect, enhance and restore the natural resources of the entire Rogue Basin through a framework of assessing the Lower Rogue Watershed’s condit ions and trends, implementing and monitoring proven management practices, and testing new management practices that are designed to support environmental integrity and economic stability for the communities of the Lower Rogue Watershed. The “Lower Rogue Watershed” consists of all lands and waters that drain into the Rogue and Illinois Rivers within Curry County. Title: Lower Rogue Watershed Assessment Abstract -- Thank you for your interest in The Lower Rogue Watershed Assessment. The Lower Rogue Watershed Council’s mission is: To help foster, develop and coordinate a basin-wide approach to resource planning and management so as to protect, enhance and restore the natural resources of the entire Rogue Basin through a framework of assessing the Lower Rogue Watershed’s condit ions and trends, implementing and monitoring proven management practices, and testing new management practices that are designed to support environmental integrity and economic stability for the communities of the Lower Rogue Watershed. The “Lower Rogue Watershed” consists of all lands and waters that drain into the Rogue and Illinois Rivers within Curry County. Close

• 64. [Article] Watershed response to western juniper control

  Western juniper (Juniperus occidentalis) encroachment has been associated with increased soil loss and reduced infiltration resulting in the loss of native herbaceous plant communities and the bird and ...

  Citation × Citation Citation Abstract Copy Title: Watershed response to western juniper control Author: Deboodt, Timothy L. Western juniper (Juniperus occidentalis) encroachment has been associated with increased soil loss and reduced infiltration resulting in the loss of native herbaceous plant communities and the bird and animal species that rely on them. Hydrologically, however, change in water yield has been linked with the amount of annual precipitation a site received. Studies published in the 1970’s and 1980’s, suggest that a minimum 4500 mm (18 inches) of annual precipitation was necessary before an increase in water yield manifested itself following vegetation manipulation. In 1993, a paired watershed study was initiated in the Camp Creek drainage, a tributary of the Crooked River of central Oregon, to evaluate the impacts of cutting western juniper on the hydrologic function of those sites. The study involved a paired watershed approach using watersheds of approximately 110 hectares (270 acres) each to evaluate changes in a system’s water budget following the reduction of western juniper. The 30 year average annual precipitation for the area is 3500 mm (13.75) and during the study period, annual precipitation ranged from 80 percent to 129 percent of average. In 2005, following 12 years of pretreatment monitoring in the 2 watersheds (Mays and Jensen) all post-European aged juniper (juniper < 140 years of age) were cut from the treatment watershed (Mays). Analysis indicated that juniper reduction significantly increased late season spring flow by 225 percent (alpha > .05), increased days of recorded ground water by an average of 41 days (alpha > .05) and increased the relative availability of late season soil moisture at soil depths of .76 m (27 inches) (alpha > 0.1). Ephemeral channel flow did not show a predictable trend during 2 years of post treatment measurements. Channel flow is dependent on spring snow melt and severe summer thunderstorm activity. When winter soils were greater than 0 degrees Celsius (32 degrees F), the source of channel flow in Mays was observed to be seepage from the channel banks. Channel flow in Jensen appeared to be a result of rock forcing subsurface flows to the surface. Vegetative responses showed significant increases in perennial forb canopy cover (alpha > .01) and annual forb and annual grass basal cover (alpha > .05). Increases were also found in reduction of percent bare ground and increase in shrub cover, but were not significant. A statistically insignificant decrease in perennial grass cover was noted in the treated watershed however a large amount of reproductive culms were noted in the treated watershed in 2007 compared to the control watershed. Hillslope erosion and channel morphology showed no predictable trend following treatment. Inherent differences in channel morphology between the two watershed prior to treatment existed. This difference may be a product of the two channels being at different evolutionary or successional stages relative to each other and thus indicating that channel recovery would be different for each watershed. The Camp Creek project illustrated that for this system, managing vegetation for water yield may be obtainable at a much lower precipitation threshold than what was previously reported in the literature. Title: Watershed response to western juniper control Author: Deboodt, Timothy L. Western juniper (Juniperus occidentalis) encroachment has been associated with increased soil loss and reduced infiltration resulting in the loss of native herbaceous plant communities and the bird and animal species that rely on them. Hydrologically, however, change in water yield has been linked with the amount of annual precipitation a site received. Studies published in the 1970’s and 1980’s, suggest that a minimum 4500 mm (18 inches) of annual precipitation was necessary before an increase in water yield manifested itself following vegetation manipulation. In 1993, a paired watershed study was initiated in the Camp Creek drainage, a tributary of the Crooked River of central Oregon, to evaluate the impacts of cutting western juniper on the hydrologic function of those sites. The study involved a paired watershed approach using watersheds of approximately 110 hectares (270 acres) each to evaluate changes in a system’s water budget following the reduction of western juniper. The 30 year average annual precipitation for the area is 3500 mm (13.75) and during the study period, annual precipitation ranged from 80 percent to 129 percent of average. In 2005, following 12 years of pretreatment monitoring in the 2 watersheds (Mays and Jensen) all post-European aged juniper (juniper < 140 years of age) were cut from the treatment watershed (Mays). Analysis indicated that juniper reduction significantly increased late season spring flow by 225 percent (alpha > .05), increased days of recorded ground water by an average of 41 days (alpha > .05) and increased the relative availability of late season soil moisture at soil depths of .76 m (27 inches) (alpha > 0.1). Ephemeral channel flow did not show a predictable trend during 2 years of post treatment measurements. Channel flow is dependent on spring snow melt and severe summer thunderstorm activity. When winter soils were greater than 0 degrees Celsius (32 degrees F), the source of channel flow in Mays was observed to be seepage from the channel banks. Channel flow in Jensen appeared to be a result of rock forcing subsurface flows to the surface. Vegetative responses showed significant increases in perennial forb canopy cover (alpha > .01) and annual forb and annual grass basal cover (alpha > .05). Increases were also found in reduction of percent bare ground and increase in shrub cover, but were not significant. A statistically insignificant decrease in perennial grass cover was noted in the treated watershed however a large amount of reproductive culms were noted in the treated watershed in 2007 compared to the control watershed. Hillslope erosion and channel morphology showed no predictable trend following treatment. Inherent differences in channel morphology between the two watershed prior to treatment existed. This difference may be a product of the two channels being at different evolutionary or successional stages relative to each other and thus indicating that channel recovery would be different for each watershed. The Camp Creek project illustrated that for this system, managing vegetation for water yield may be obtainable at a much lower precipitation threshold than what was previously reported in the literature. Close

• 65. [Article] The Partnership for Coastal Watersheds collaboration compact

  Unsigned document

  Citation × Citation Citation Abstract Copy Title: The Partnership for Coastal Watersheds collaboration compact Author: Partnership for Coastal Watersheds Unsigned document Title: The Partnership for Coastal Watersheds collaboration compact Author: Partnership for Coastal Watersheds Unsigned document Close

• 66. [Article] Streamflow Analysis and a Comparison of Hydrologic Metrics in Urban Streams

  This study investigates the hydrologic effects of urbanization in two Portland, Oregon streams through a comparison of three hydrologic metrics. Hydrologic metrics used in this study are the mean annual ...

  Citation × Citation Citation Abstract Copy Title: Streamflow Analysis and a Comparison of Hydrologic Metrics in Urban Streams Author: Wood, Matthew Lawton Year: 2012 This study investigates the hydrologic effects of urbanization in two Portland, Oregon streams through a comparison of three hydrologic metrics. Hydrologic metrics used in this study are the mean annual runoff ratio (Qa), mean seasonal runoff ratio (Qw and Qd), and the fraction of time that streamflow exceeds the mean streamflow during the year (TQmean). Additionally, the relative change in streamflow in response to storm events was examined for two watersheds. For this investigation urban development is represented by two urbanization metrics: percent impervious and road density. Descriptive and inferential statistics were used to evaluate the relationship between the hydrologic metrics and the amount of urban development in each watershed. The effect of watershed size was also investigated using nested watersheds, with watershed size ranging from 6 km2 to 138km 2. The results indicate that annual and seasonal runoff ratios have difficulty capturing the dynamic hydrologic behavior in urban watersheds. TQmean was useful at capturing the flashy behavior of the Upper Fanno watershed, however it did not perform as well in Kelley watershed possibly due to the influence of impermeable soils and steep slopes. Unexpected values for hydrologic metrics in Lower Johnson, Sycamore and Kelley watersheds could be the result water collection systems that appear to route surface water outside of their watersheds as well as permeable soils. Storm event analysis was effective at characterizing the behavior for the selected watersheds, indicating that shorter time scales may best capture the dynamic behavior of urban watersheds. Title: Streamflow Analysis and a Comparison of Hydrologic Metrics in Urban Streams Author: Wood, Matthew Lawton Year: 2012 This study investigates the hydrologic effects of urbanization in two Portland, Oregon streams through a comparison of three hydrologic metrics. Hydrologic metrics used in this study are the mean annual runoff ratio (Qa), mean seasonal runoff ratio (Qw and Qd), and the fraction of time that streamflow exceeds the mean streamflow during the year (TQmean). Additionally, the relative change in streamflow in response to storm events was examined for two watersheds. For this investigation urban development is represented by two urbanization metrics: percent impervious and road density. Descriptive and inferential statistics were used to evaluate the relationship between the hydrologic metrics and the amount of urban development in each watershed. The effect of watershed size was also investigated using nested watersheds, with watershed size ranging from 6 km2 to 138km 2. The results indicate that annual and seasonal runoff ratios have difficulty capturing the dynamic hydrologic behavior in urban watersheds. TQmean was useful at capturing the flashy behavior of the Upper Fanno watershed, however it did not perform as well in Kelley watershed possibly due to the influence of impermeable soils and steep slopes. Unexpected values for hydrologic metrics in Lower Johnson, Sycamore and Kelley watersheds could be the result water collection systems that appear to route surface water outside of their watersheds as well as permeable soils. Storm event analysis was effective at characterizing the behavior for the selected watersheds, indicating that shorter time scales may best capture the dynamic behavior of urban watersheds. Close

• 67. [Article] Wallowa Agricultural Water Quality Management Area plan

  This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.

  Citation × Citation Citation Abstract Copy Title: Wallowa Agricultural Water Quality Management Area plan Year: 2001 This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes. Title: Wallowa Agricultural Water Quality Management Area plan Year: 2001 This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes. Close

• 68. [Article] Slate Creek Watershed Assessment

  Abstract -- The analysis was jointly conducted by the Applegate River Watershed Council (ARWC), Bureau of Land Management (BLM), and the Siskiyou National Forest. Accordingly, the assessment method was ...

  Citation × Citation Citation Abstract Copy Title: Slate Creek Watershed Assessment Abstract -- The analysis was jointly conducted by the Applegate River Watershed Council (ARWC), Bureau of Land Management (BLM), and the Siskiyou National Forest. Accordingly, the assessment method was designed to fulfill obligations for the Oregon Watershed Enhancement Board and the Federal Guide to Watershed Analysis. Issues and key questions, developed by the federal agencies, ARWC, and landowners guide the content of this analysis. Key issues focus the assessment on the principle concerns of the Slate Creek Watershed. This watershed assessment is grouped into three main categories: Cultural and Social environment, Terrestrial environment, and the Aquatic environment. The cultural and social environment examines the historic and current human uses in the watershed. The terrestrial environment focuses on vegetation patterns, wildlife habitat and fire/fuel conditions. Fish habitat conditions, water quality and riparian zone function are discussed in the aquatic environment. Title: Slate Creek Watershed Assessment Abstract -- The analysis was jointly conducted by the Applegate River Watershed Council (ARWC), Bureau of Land Management (BLM), and the Siskiyou National Forest. Accordingly, the assessment method was designed to fulfill obligations for the Oregon Watershed Enhancement Board and the Federal Guide to Watershed Analysis. Issues and key questions, developed by the federal agencies, ARWC, and landowners guide the content of this analysis. Key issues focus the assessment on the principle concerns of the Slate Creek Watershed. This watershed assessment is grouped into three main categories: Cultural and Social environment, Terrestrial environment, and the Aquatic environment. The cultural and social environment examines the historic and current human uses in the watershed. The terrestrial environment focuses on vegetation patterns, wildlife habitat and fire/fuel conditions. Fish habitat conditions, water quality and riparian zone function are discussed in the aquatic environment. Close

• 69. [Article] Mobilizing Human Resources for Watershed Restoration

  2 p.

  Citation × Citation Citation Abstract Copy Title: Mobilizing Human Resources for Watershed Restoration Author: MacDonald, Fraser, Moseley, Cassandra, Davis, Emily Jane, Nielsen-Pincus, Max, Ellison, Autumn Year: 2010 2 p. Title: Mobilizing Human Resources for Watershed Restoration Author: MacDonald, Fraser, Moseley, Cassandra, Davis, Emily Jane, Nielsen-Pincus, Max, Ellison, Autumn Year: 2010 2 p. Close

• 70. [Article] Nehalem River watershed assessment

  Watershed assessment is a process for evaluating how well a watershed is working. The purpose of this assessment was to determine how natural and human-induced changes have impacted the sustainability ...

  Citation × Citation Citation Abstract Copy Title: Nehalem River watershed assessment Author: Maser, Jospeh, Johnson, Jill Watershed assessment is a process for evaluating how well a watershed is working. The purpose of this assessment was to determine how natural and human-induced changes have impacted the sustainability of salmon populations in the Nehalem River Watershed. Both historical and current information is included regarding the watershed’s ability to produce clean water and healthy salmon habitat. The assessment was prepared for the Upper and Lower Nehalem River Watershed Councils. It will be a baseline for developing and prioritizing potential restoration projects in terms of fish habitat. Geographic Information Systems (GIS) was used for much of the analysis and has been provided to the watershed councils. Title: Nehalem River watershed assessment Author: Maser, Jospeh, Johnson, Jill Watershed assessment is a process for evaluating how well a watershed is working. The purpose of this assessment was to determine how natural and human-induced changes have impacted the sustainability of salmon populations in the Nehalem River Watershed. Both historical and current information is included regarding the watershed’s ability to produce clean water and healthy salmon habitat. The assessment was prepared for the Upper and Lower Nehalem River Watershed Councils. It will be a baseline for developing and prioritizing potential restoration projects in terms of fish habitat. Geographic Information Systems (GIS) was used for much of the analysis and has been provided to the watershed councils. Close