Search

Search Results

• 21. [Article] Essays on land use regulation

  This dissertation consists of three papers on land use economics and regulation. The first paper focuses on the environmental impacts of land use and their implications for the design on water quality ...

  Citation × Citation Citation Abstract Copy Title: Essays on land use regulation Author: Hascic, Ivan This dissertation consists of three papers on land use economics and regulation. The first paper focuses on the environmental impacts of land use and their implications for the design on water quality trading policies. The second and third papers address local land use regulations and their impact on land values and land use patterns. The first paper provides a national-scale, watershed-level assessment of land use impacts on water quality and aquatic ecosystems in the United States. The results suggest that the level of conventional water pollution in a watershed is significantly affected by the amount of land allocated to intensive agriculture and urban development, while the level of toxic water pollution is significantly affected by the amount of land allocated to transportation and mining. Implications of the results for the design and implementation of water quality trading policies are discussed. The second paper develops an empirical framework to conduct an exploratory analysis of effects of land use regulations on land values and land use patterns in a GIS-based landscape near Eugene, Oregon. All the land use regulations considered in this study, including exclusive farm use zoning, forest zoning, urban growth boundary designation, residential density zoning, commercial zoning, and industrial zoning, are found to affect land value and use both inside and outside of the designated zones. While there are many issues this framework does not address, preliminary results indicate that regulations (except commercial zoning) tend to increase the value of land outside the designated zones, but reduce the value of land inside the designated zones. The framework is applied to measure the reduction in value due to regulations vs. the value of individual exemptions at the parcel level to illuminate the controversy surrounding Oregon's Measure 37. The reductions in value due to regulations are found to be considerably smaller than the values of individual exemptions for almost all regulations contested in the Measure 37 claims. The third paper evaluates the efficiency of the current system of land use regulation, analyzes the possible changes to the regulatory structure, and studies the role of spatial and temporal interaction among neighboring land uses. Title: Essays on land use regulation Author: Hascic, Ivan This dissertation consists of three papers on land use economics and regulation. The first paper focuses on the environmental impacts of land use and their implications for the design on water quality trading policies. The second and third papers address local land use regulations and their impact on land values and land use patterns. The first paper provides a national-scale, watershed-level assessment of land use impacts on water quality and aquatic ecosystems in the United States. The results suggest that the level of conventional water pollution in a watershed is significantly affected by the amount of land allocated to intensive agriculture and urban development, while the level of toxic water pollution is significantly affected by the amount of land allocated to transportation and mining. Implications of the results for the design and implementation of water quality trading policies are discussed. The second paper develops an empirical framework to conduct an exploratory analysis of effects of land use regulations on land values and land use patterns in a GIS-based landscape near Eugene, Oregon. All the land use regulations considered in this study, including exclusive farm use zoning, forest zoning, urban growth boundary designation, residential density zoning, commercial zoning, and industrial zoning, are found to affect land value and use both inside and outside of the designated zones. While there are many issues this framework does not address, preliminary results indicate that regulations (except commercial zoning) tend to increase the value of land outside the designated zones, but reduce the value of land inside the designated zones. The framework is applied to measure the reduction in value due to regulations vs. the value of individual exemptions at the parcel level to illuminate the controversy surrounding Oregon's Measure 37. The reductions in value due to regulations are found to be considerably smaller than the values of individual exemptions for almost all regulations contested in the Measure 37 claims. The third paper evaluates the efficiency of the current system of land use regulation, analyzes the possible changes to the regulatory structure, and studies the role of spatial and temporal interaction among neighboring land uses. Close

• 22. [Article] Stormwater Solutions for Improving Water Quality: Supporting the Development of the Amazon Creek Initiative

  The Long Tom Watershed Council (LTWC) is a non-profit organization in Eugene, Oregon that serves to protect and enhance watershed health in the Long Tom River Basin. The Amazon Creek Initiative was launched ...

  Citation × Citation Citation Abstract Copy Title: Stormwater Solutions for Improving Water Quality: Supporting the Development of the Amazon Creek Initiative Author: Larson, Kristen M. The Long Tom Watershed Council (LTWC) is a non-profit organization in Eugene, Oregon that serves to protect and enhance watershed health in the Long Tom River Basin. The Amazon Creek Initiative was launched by the LTWC in 2011 as Oregon’s newest Pesticide Stewardship Partner. Goals of the initiative are to improve water quality and habitat function in Amazon Creek by encouraging voluntary retrofits of low-impact development (LID) and through outreach and education of pollution prevention practices. This internship involved a series of projects in support of the development of the Amazon Creek Initiative. Accomplishments included surface water sampling, stakeholder research, development of communication tools, creation of an LID cost calculator, site visits and assessments of pesticide retailers, and a review of national efforts to train pesticide retail staff in integrated pest management. This work supports the Amazon Creek Initiative as it moves towards implementation and provided diverse learning opportunities in non-profit and watershed council operations, communicating a scientific message, and low-impact development solutions to stormwater management. Title: Stormwater Solutions for Improving Water Quality: Supporting the Development of the Amazon Creek Initiative Author: Larson, Kristen M. The Long Tom Watershed Council (LTWC) is a non-profit organization in Eugene, Oregon that serves to protect and enhance watershed health in the Long Tom River Basin. The Amazon Creek Initiative was launched by the LTWC in 2011 as Oregon’s newest Pesticide Stewardship Partner. Goals of the initiative are to improve water quality and habitat function in Amazon Creek by encouraging voluntary retrofits of low-impact development (LID) and through outreach and education of pollution prevention practices. This internship involved a series of projects in support of the development of the Amazon Creek Initiative. Accomplishments included surface water sampling, stakeholder research, development of communication tools, creation of an LID cost calculator, site visits and assessments of pesticide retailers, and a review of national efforts to train pesticide retail staff in integrated pest management. This work supports the Amazon Creek Initiative as it moves towards implementation and provided diverse learning opportunities in non-profit and watershed council operations, communicating a scientific message, and low-impact development solutions to stormwater management. Close

• 23. [Article] Hydrogeologic Characterization of Dutch Canyon, Scappoose, Oregon

  Dutch Canyon is located directly west of the City of Scappoose in Columbia County Oregon. This area is proximate to Highway 30, a major access corridor to downtown Portland, and is experiencing a population ...

  Citation × Citation Citation Abstract Copy Title: Hydrogeologic Characterization of Dutch Canyon, Scappoose, Oregon Author: Wagner, Derrick Lee Year: 2013 Dutch Canyon is located directly west of the City of Scappoose in Columbia County Oregon. This area is proximate to Highway 30, a major access corridor to downtown Portland, and is experiencing a population increase, which is expected to continue and likely accelerate. As a result, there is growing pressure on water resources. Individual and community efforts to utilize groundwater resources have been hampered by generally poor groundwater yields and water quality concerns outside of the Columbia River corridor and a lack of published hydrogeologic information for the region. The intent of this study is to identify the water-bearing units present in Dutch Canyon and to characterize water quality within these units. The physical hydrogeology of Dutch Canyon was assessed mainly through the collation of 196 local well reports that contained lithologic information from which individual hydrostratigraphic units were identified and characterized. Hydraulic parameters for individual units were estimated using pump rates and drawdowns provided in select well reports. Water quality for the units identified was assessed through the collection of 48 samples of well, spring, and stream water from Dutch Canyon. Measurements of pH, specific conductivity, temperature, dissolved oxygen, reduction potential, and alkalinity were recorded in the field and samples were analyzed for major ions, arsenic, and stable isotopes. The major water-bearing units of Dutch Canyon were separated into five physically distinct hydrostratigrapic units: the lower, middle, and upper units of the sedimentary Lower Miocene Scappoose Formation, and the Wapshilla Ridge and Ortley members of the Lower to Middle Miocene Grande Ronde Basalt. Groundwater flow likely occurs in discrete, relatively thin (~2- to 10-m thick) zones within the Grand Ronde Basalt members. These units only occur along the slopes and ridges of Dutch Canyon west of the Portland Hills Fault, which parallels the eastern margin of the study area. The Scappoose Formation units contain clay- and silt-rich layers and lenses that limit the useable aquifer volume and vertical movement of groundwaters. In general, all hydrostratrigraphic units east of the Portland Hills Fault have low transmissivities and water wells completed in each of them are commonly low- yielding wells, though there are some exceptions. Geochemically, the lower and middle units of the Scappoose Formation were similar to one another with many wells yielding groundwater with high total dissolved solids (TDS) contents (mean TDS = 330 mg L-1; n = 27). Nearly 20% of the wells sampled that were screened in these units (5 of 27) yielded groundwater that exceeded the U.S. Environmental Protection Agency's National Secondary (non-enforceable) Drinking Water Regulation standard of 500 mg L-1 TDS. The upper unit of the Scappoose Formation and the overlying Grande Ronde Basalt members generally yield water with lower TDS contents (mean < 200 mg L-1; maximum = 342 mg L-1; n = 20). Groundwater resources in Dutch Canyon are limited and low well yields are common. The primary water quality concern is saline water, which is generally found in the lower and middle units of the Scappoose Formation near the valley floor. Low recharge rates determined from hydrograph analysis of stream discharge measurements are consistent with the geology and steep terrain of the area and further limit the available groundwater and the degree of flushing of what may be connate waters in the deeper units. Title: Hydrogeologic Characterization of Dutch Canyon, Scappoose, Oregon Author: Wagner, Derrick Lee Year: 2013 Dutch Canyon is located directly west of the City of Scappoose in Columbia County Oregon. This area is proximate to Highway 30, a major access corridor to downtown Portland, and is experiencing a population increase, which is expected to continue and likely accelerate. As a result, there is growing pressure on water resources. Individual and community efforts to utilize groundwater resources have been hampered by generally poor groundwater yields and water quality concerns outside of the Columbia River corridor and a lack of published hydrogeologic information for the region. The intent of this study is to identify the water-bearing units present in Dutch Canyon and to characterize water quality within these units. The physical hydrogeology of Dutch Canyon was assessed mainly through the collation of 196 local well reports that contained lithologic information from which individual hydrostratigraphic units were identified and characterized. Hydraulic parameters for individual units were estimated using pump rates and drawdowns provided in select well reports. Water quality for the units identified was assessed through the collection of 48 samples of well, spring, and stream water from Dutch Canyon. Measurements of pH, specific conductivity, temperature, dissolved oxygen, reduction potential, and alkalinity were recorded in the field and samples were analyzed for major ions, arsenic, and stable isotopes. The major water-bearing units of Dutch Canyon were separated into five physically distinct hydrostratigrapic units: the lower, middle, and upper units of the sedimentary Lower Miocene Scappoose Formation, and the Wapshilla Ridge and Ortley members of the Lower to Middle Miocene Grande Ronde Basalt. Groundwater flow likely occurs in discrete, relatively thin (~2- to 10-m thick) zones within the Grand Ronde Basalt members. These units only occur along the slopes and ridges of Dutch Canyon west of the Portland Hills Fault, which parallels the eastern margin of the study area. The Scappoose Formation units contain clay- and silt-rich layers and lenses that limit the useable aquifer volume and vertical movement of groundwaters. In general, all hydrostratrigraphic units east of the Portland Hills Fault have low transmissivities and water wells completed in each of them are commonly low- yielding wells, though there are some exceptions. Geochemically, the lower and middle units of the Scappoose Formation were similar to one another with many wells yielding groundwater with high total dissolved solids (TDS) contents (mean TDS = 330 mg L-1; n = 27). Nearly 20% of the wells sampled that were screened in these units (5 of 27) yielded groundwater that exceeded the U.S. Environmental Protection Agency's National Secondary (non-enforceable) Drinking Water Regulation standard of 500 mg L-1 TDS. The upper unit of the Scappoose Formation and the overlying Grande Ronde Basalt members generally yield water with lower TDS contents (mean < 200 mg L-1; maximum = 342 mg L-1; n = 20). Groundwater resources in Dutch Canyon are limited and low well yields are common. The primary water quality concern is saline water, which is generally found in the lower and middle units of the Scappoose Formation near the valley floor. Low recharge rates determined from hydrograph analysis of stream discharge measurements are consistent with the geology and steep terrain of the area and further limit the available groundwater and the degree of flushing of what may be connate waters in the deeper units. Close

• 24. [Image] Ground Water and Energy: Proceedings of the U.S. Department of Energy's National Workshop, Albuquerque, New Mexico, January 29-31, 1980

  	This publication are the findings of the U. S. Geological Survey and U. S. Department of Energy as well as a broad range of other viewpoints and perspectives regarding the ideas behind ground water and ...
  	Citation × Citation Citation Abstract Copy Title: Ground Water and Energy: Proceedings of the U.S. Department of Energy's National Workshop, Albuquerque, New Mexico, January 29-31, 1980 Author: Office of Environmental Assessments Year: 1980 This publication are the findings of the U. S. Geological Survey and U. S. Department of Energy as well as a broad range of other viewpoints and perspectives regarding the ideas behind ground water and energy Title: Ground Water and Energy: Proceedings of the U.S. Department of Energy's National Workshop, Albuquerque, New Mexico, January 29-31, 1980 Author: Office of Environmental Assessments Year: 1980 This publication are the findings of the U. S. Geological Survey and U. S. Department of Energy as well as a broad range of other viewpoints and perspectives regarding the ideas behind ground water and energy Close

• 25. [Article] Assessing a Fluorescence Spectroscopy Method for In-Situ Microbial Drinking Water Quality

  Waterborne disease is a significant contributor to the global burden of disease, in particular among high-risk populations in developing nations. State-of-the-art methods for the enumeration of microbial ...

  Citation × Citation Citation Abstract Copy Title: Assessing a Fluorescence Spectroscopy Method for In-Situ Microbial Drinking Water Quality Author: Sharpe, Taylor Jeffery Year: 2017 Waterborne disease is a significant contributor to the global burden of disease, in particular among high-risk populations in developing nations. State-of-the-art methods for the enumeration of microbial pathogens in drinking water sources have important limitations, including high initial cost, 24-48 hour delays in results, high staffing and facility requirements, and training requirements which all become especially problematic in the developing nation context. A number of alternative approaches to microbial water quality testing have been proposed, with the goal of decreasing the required testing time, decreasing overall costs, leveraging appropriate technology approaches, or improving sensitivity or specificity of the water quality testing method. One approach that may offer solutions to some of these limitations involves the deployment of sensor networks using fluorescent spectroscopy to detect intrinsic protein fluorescence in water samples as a proxy for microbial activity. In recent years, a number of researchers have found significant and meaningful correlations between indicator bacteria species and the protein fluorescence of drinking water samples. Additionally, advances in the semiconductor industry could be used to drive down the cost of such sensors. This technology may also be extensible to other water quality parameters, including dissolved organic matter or the presence of fluorescent pollutants. In this thesis, a literature review describes the fundamentals of fluorescence spectroscopy, historical and recent work regarding the fluorescence of the amino acid tryptophan and associated bacterial fluorescence, possible mechanisms for this association, and potential applications of this technology for drinking water quality monitoring and waste water process control. Extensibility of the technology is also discussed. Next, experimental methodology in reproduction of similar results is described. Samples were taken from seven (7) surface water sources and tested using membrane filtration and an off-the-shelf fluorescence spectrometer to help examine the association between the presence of indicator bacteria and the tryptophan fluorescence of the water sample. The results, showing an association of R2 = 0.560, are compared to the results of recent similar experiments. Finally, two prototypes are described, including their design requirements and data from prototype testing. The results of the testing are briefly discussed, and next steps are outlined with the goal of developing a low-cost, in-situ microbial water quality sensor using fluorescence spectroscopy principles. Title: Assessing a Fluorescence Spectroscopy Method for In-Situ Microbial Drinking Water Quality Author: Sharpe, Taylor Jeffery Year: 2017 Waterborne disease is a significant contributor to the global burden of disease, in particular among high-risk populations in developing nations. State-of-the-art methods for the enumeration of microbial pathogens in drinking water sources have important limitations, including high initial cost, 24-48 hour delays in results, high staffing and facility requirements, and training requirements which all become especially problematic in the developing nation context. A number of alternative approaches to microbial water quality testing have been proposed, with the goal of decreasing the required testing time, decreasing overall costs, leveraging appropriate technology approaches, or improving sensitivity or specificity of the water quality testing method. One approach that may offer solutions to some of these limitations involves the deployment of sensor networks using fluorescent spectroscopy to detect intrinsic protein fluorescence in water samples as a proxy for microbial activity. In recent years, a number of researchers have found significant and meaningful correlations between indicator bacteria species and the protein fluorescence of drinking water samples. Additionally, advances in the semiconductor industry could be used to drive down the cost of such sensors. This technology may also be extensible to other water quality parameters, including dissolved organic matter or the presence of fluorescent pollutants. In this thesis, a literature review describes the fundamentals of fluorescence spectroscopy, historical and recent work regarding the fluorescence of the amino acid tryptophan and associated bacterial fluorescence, possible mechanisms for this association, and potential applications of this technology for drinking water quality monitoring and waste water process control. Extensibility of the technology is also discussed. Next, experimental methodology in reproduction of similar results is described. Samples were taken from seven (7) surface water sources and tested using membrane filtration and an off-the-shelf fluorescence spectrometer to help examine the association between the presence of indicator bacteria and the tryptophan fluorescence of the water sample. The results, showing an association of R2 = 0.560, are compared to the results of recent similar experiments. Finally, two prototypes are described, including their design requirements and data from prototype testing. The results of the testing are briefly discussed, and next steps are outlined with the goal of developing a low-cost, in-situ microbial water quality sensor using fluorescence spectroscopy principles. Close

• 26. [Article] Waldo Lake, Oregon: A Special Study

  Abstract -- A limnological study of Waldo Lake, Oregon, showed the lake to be an extremely unproductive freshwater environment. Annual phyto-plankton primary production, estimate in situ with 14 c, approximated ...

  Citation × Citation Citation Abstract Copy Title: Waldo Lake, Oregon: A Special Study Abstract -- A limnological study of Waldo Lake, Oregon, showed the lake to be an extremely unproductive freshwater environment. Annual phyto-plankton primary production, estimate in situ with 14 c, approximated that of a highly oligotrophic arctic lake. The rate of daily production averaged 29 mgC/m/day during June, July and August, 1969. Waldo Lake, located in the Willamette National Forest near the summit of the Cascade Mountain Range, has been relatively inaccessible. Because of recent recreational development in the basin, including a paved highway leading to several lakeside campsites, use of the lake is expected to increase substantially. Consequently, biological productivity and water quality will be affected. The limnological data presented, especially productivity estimates, are intended to be used as reference points for future assessments of eutrophication in Waldo Lake as well as other high quality lakes in the Cascade Range. Title: Waldo Lake, Oregon: A Special Study Abstract -- A limnological study of Waldo Lake, Oregon, showed the lake to be an extremely unproductive freshwater environment. Annual phyto-plankton primary production, estimate in situ with 14 c, approximated that of a highly oligotrophic arctic lake. The rate of daily production averaged 29 mgC/m/day during June, July and August, 1969. Waldo Lake, located in the Willamette National Forest near the summit of the Cascade Mountain Range, has been relatively inaccessible. Because of recent recreational development in the basin, including a paved highway leading to several lakeside campsites, use of the lake is expected to increase substantially. Consequently, biological productivity and water quality will be affected. The limnological data presented, especially productivity estimates, are intended to be used as reference points for future assessments of eutrophication in Waldo Lake as well as other high quality lakes in the Cascade Range. Close

• 27. [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

• 28. [Image] The Water Report - Watershed assessments: the Upper Klamath Basin process

  	Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. See the full report at http://www.thewaterreport.com/
  	Citation × Citation Citation Abstract Copy Title: The Water Report - Watershed assessments: the Upper Klamath Basin process Author: Envirotech Publications Year: 2004, 2008, 2006 Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. See the full report at http://www.thewaterreport.com/ Title: The Water Report - Watershed assessments: the Upper Klamath Basin process Author: Envirotech Publications Year: 2004, 2008, 2006 Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. See the full report at http://www.thewaterreport.com/ Close

• 29. [Article] Summary of information on aquatic biota and their habitats in the Willamette Basin, Oregon, through 1995

  This report reviews and summarizes available information on aquatic biological communities in the Willamette Basin through 1995. Specifically, the report describes (1) the distribution, abndance, and trends ...

  Citation × Citation Citation Abstract Copy Title: Summary of information on aquatic biota and their habitats in the Willamette Basin, Oregon, through 1995 Author: National Water-Quality Assessment Program (U.S.), Altman, Bob, Henson, Colleen M., Waite, Ian R., U.S. Fish and Wildlife Service, Geological Survey (U.S.) This report reviews and summarizes available information on aquatic biological communities in the Willamette Basin through 1995. Specifically, the report describes (1) the distribution, abndance, and trends of three taxonomic groups--algae, macroinvertebrates, and fish--and, to a lesser degree, other selected semi-aquatic taxa (i.e., taxa frequenting but not living wholly in water), including amphibians and reptiles, birds, and mammals, (2) the types of aquatic and riparian habitat that support and influence aquatic communities and their biotic constituents, (3) the natural and human-associated impacts on that habitat and associated biological communities, amd (4) the levels of enviroinmental contaminants to which biological communities and specific biota are exposed. The information in this report is intended to aid in the identification of data gaps relative to taxa and geographic areas, and to stimulate collaboration and increase coordination in present and future ecological research in the Willamette Basin. Title: Summary of information on aquatic biota and their habitats in the Willamette Basin, Oregon, through 1995 Author: National Water-Quality Assessment Program (U.S.), Altman, Bob, Henson, Colleen M., Waite, Ian R., U.S. Fish and Wildlife Service, Geological Survey (U.S.) This report reviews and summarizes available information on aquatic biological communities in the Willamette Basin through 1995. Specifically, the report describes (1) the distribution, abndance, and trends of three taxonomic groups--algae, macroinvertebrates, and fish--and, to a lesser degree, other selected semi-aquatic taxa (i.e., taxa frequenting but not living wholly in water), including amphibians and reptiles, birds, and mammals, (2) the types of aquatic and riparian habitat that support and influence aquatic communities and their biotic constituents, (3) the natural and human-associated impacts on that habitat and associated biological communities, amd (4) the levels of enviroinmental contaminants to which biological communities and specific biota are exposed. The information in this report is intended to aid in the identification of data gaps relative to taxa and geographic areas, and to stimulate collaboration and increase coordination in present and future ecological research in the Willamette Basin. Close

• 30. [Article] Bridge thin project environmental assessment

  485 pp. Figures, tables, map, and appendices. T 15 S, R 4 E; T 15 S, R 5 E; T 16 S, R 4 E; T 16 S, R 5 E. Captured April 16, 2008.

  Citation × Citation Citation Abstract Copy Title: Bridge thin project environmental assessment Author: McKenzie River Ranger District (Or.) Year: 2008 485 pp. Figures, tables, map, and appendices. T 15 S, R 4 E; T 15 S, R 5 E; T 16 S, R 4 E; T 16 S, R 5 E. Captured April 16, 2008. Title: Bridge thin project environmental assessment Author: McKenzie River Ranger District (Or.) Year: 2008 485 pp. Figures, tables, map, and appendices. T 15 S, R 4 E; T 15 S, R 5 E; T 16 S, R 4 E; T 16 S, R 5 E. Captured April 16, 2008. Close