Guidance and case study page 2 acknowledgements this report was prepared by the chagrin river watershed partners, inc. Building riverfront property for fish and wildlife along oregons willamette river. Floodplain restoration in offchannel habitats used for gravel mining in the willamette river basin. Finley national wildlife refuge and located about 10 miles 16 km south of corvallis in benton county, oregon it is the largest remaining native unplowed example of bottomland interior valley. Provide public access to and along the wate rfront for recreation, scientific study, educational instruction, etc. Examples of tools for protecting and managing natural floodplain resources. The riverbend levee setback and floodplain restoration project is located along the left south bank of the cedar river between river mile 6. Since 2001, our award winning paddle oregon event stands apart as the. It has the th largest flow of all rivers in the continental united states. Our publication, floodplain restoration, tells the story of stream systems stream channels and their adjacent floodplainsin the eastern united states, particularly in the region known as the piedmont province. Union pacific railroad, port of portland, oregon department of state lands site description. Willamette river studies willamette water supply program. Land cover of the willamette valley, circa 1850 includes study site.
Since 2001, our award winning paddle oregon event stands apart as the premier canoeandkayakcamping adventure on the willamette river, a national water trail. Consider largescale floodplain restoration in the foothills area. Strategies and tools to maintain or restore floodplain resources. To reduce the loss of life and property caused by floods and to protect and restore the natural resources and functions of floodplains. Stream and floodplain restoration banta property floodplain restoration restored 2,250 linear feet of stream floodplain, relocated the channel back to the center of the valley, at the lowest elevation. I will discuss the historical dynamic nature of the willamette river, including channel complexities, floodplain function, riparian forests and known flood history. The great flood devastated the valleys economy and resulted in the deaths of several people, but it also brought the valleys. Historically, floodplains in the willamette river basin were complex and had a natural ability to absorb and diminish floods. General floodplain map of the city showing fema 100 year floodplain and 1996 innundation boundary in link below. Willamette river flood of 1964 the oregon encyclopedia.
We recommend that you register using the same email address you use to maintain your asce member account. Since the end of the 20th century a wide range of river and floodplain restoration projects have been carried out in europe including the restoration of the skjern river in. The willamette river is an important oregon icon and its health is important to our regions livability. What you will read in this publication is only the beginning of a complex, stillevolving tale. Willamette river basin atlas oregon state university. Scientific study of the illinois river began before a century of anthropogenic change, thus providing a unique perspective for describing river ecology restoration. A floodplain development permit fld is required for any work conducted within the 100yr floodplain boundary. Field guide to common fish of the willamette valley floodplain. The mainstem willamette flows 187 miles north from the confluence of the middle and coast fork willamette rivers, to its confluence with the columbia river.
The mainstem mckenzie river local population in the willamette river basin. Efforts are underway to improve the health of the willamette river basin through studies, cleanup efforts, and coordination by regulatory agencies and drinking water providers. Willamette river flood of 1894 the oregon encyclopedia. Black creek and lamoille river floodplain restoration project by roy schiff, barry cahoon, and mike kline introduction a large floodplain restoration project was completed in 2008 in northern vermont where approximately 6 miles of former rail embankment were removed to reconnect more than 200. In this issue, we explain how systematic monitoring revealed patterns in the restoration of the 2723ha emiquon preserve on the illinois river. The willamette floodplain restoration study was designed to identify floodplain and stream restoration opportunities in the middle and coast fork rivers of the willamette basin with the goal of reducing flood damage while restoring habitat for fish and wildlife. The city of eugene provides free information regarding flood hazards for specific sites within the community and can answer many of your floodrelated questions. Wensum river restoration and floodplain enhancement. The willamette river basin the willamette river is the largest river in oregon. In this excerpt from an undated handwritten reminiscence, george anson pease, a steamboat captain based out of oregon city, relates his experiences during the 1861 willamette river flood, probably the most immense flood in the valley in recorded history. Dogami special paper 50, flood risk assessment for the columbia.
Include a project schedule, showing start and end dates, milestones, activities, and deliverables. Final report to oregon watershed enhancement board, grant 99118. Klickitat river floodplain restoration project frequently asked questions. Submittal preaward include a project schedule, showing start and end dates, milestones, activities, and deliverables. In fact only the willamette and amazon rivers received detailed studies.
Between november and february, heavy rains often fall on the deep snow in the cascade range. Hydrologic control in a willamette river floodplain wetland jim morgan, natural resources program leader, metro regional parks and greenspaces curt zonick, natural resources scientist, metro regional parks and greenspaces most effective man. But between november and february, heavy rains falling on deep snow at higher elevations, accompanied by a temperature rise and heavy precipitation in the valley. Drainage districts in multnomah county and levees in study area. Dec 20, 2012 processes and landforms of the willamette river and floodplain 1. But between november and february, heavy rains falling on deep snow at higher elevations, accompanied by a. A unified national program for floodplain management, 1994. Black creek and lamoille river floodplain restoration project. A grey clay found at a woodburn archaeological site with identical mineralogy to west eugene, was dated at 6800 bp, contemporaneous to the mt. Processes and landforms of the willamette river and floodplain.
Restoration of adversely impacted, flood prone river systems is. Hazus mh flood technical manual fema, 2011b but were not reported at an. Crwp under award lepf 05 12 from the lake erie protection fund, with funding made possible by the sale of the lake erie number plates. Each of the build alternatives would restore trimet bus. Strategies and tools to maintain or restore floodplain. Willamette river and is part of tncs larger restoration effort in the area. Streams were a braided series of small side channels that changed and rearranged. Willamette wildlife mitigation program 2011 annual report. Floodplain development is extremely limited and floodplains are very narrow in this reach of the willamette river. I will address the problems associated with flood control, and channelization specifically, as they have transpired in the willamette river basin.
Paddle oregon 2020 is happening from august 17th 21th. Riparian and floodplain restoration at the cosumnes river preserve ramona o. Landstudies designed a floodplain restoration project to address the many needs of the community. Manual for preparing regional hgm guidebooks training course materials. Delaware river, pike countysussex county line, within the delaware water gap national. Along the banks of oregons willamette river, noaa and our partners have started building habitat for fish and wildlife, just a few miles downriver from portland, oregon.
To better understand how restoration of riparian vegetation is influenced by a variety of factors, such as physical processes, especially inundation, and the multiple methods of restoration both active and semipassive that land managers have used in the. Strategies and tools to maintain or restore floodplain resources 96 table 92. Unfortunately, across the united states floodplains have been disconnected. Wensum river restoration and floodplain enhancement the unfavourable ecological condition of the river wensum sssisac has arisen over the years through a series of adverse modifications in hydromorphology of the river wensum, leading to failure of waterbody gb105034055881 to achieve good ecological potential under the wfd. Job aid floodplain and stream restoration august 2016 schedule, cost estimates, and benefitcost analysis with app. Riverbend levee setback and floodplain restoration cedar river. Portland harbor natural resource restoration portfolio. Trip details and registration information are available on our paddle oregon event now.
The project reconnects the willamette river to its floodplain, creates new river channels and increases and improves shoreline habitats. They provide clean water supplies, recreation opportunities, habitat for fish and wildlife, and when left undeveloped they safely convey flood water. This report is intended to aid restoration practitioners, floodplain managers, river conservationists and others interested in laying a foundation for successful floodplain restoration efforts in their community and across the nation. Salmon spawned and spent their first few seasons of life in these side channels. Salem features the willamette river, smaller tributaries, and streams that are susceptible to annual flooding events that pose threats to life and safety and cause significant property damage. Across the country, communities are realizing that natural floodplains are important to the health, safety, and prosperity of their citizens. Executive order 11988, floodplain management, 1977. Streams were a braided series of small side channels that changed and rearranged each year. Some areas such as parts of the river roadsanta clara area did not have sufficient population to warrant the detailed hydrologic and hydraulic analyses of the floodplain. The papers describe 1 how planktonic microorganisms, vegetation, fish, and waterbird. The project is lead by the environment agency, working in partnership with a range of organisations and individuals including natural england, the water management alliance, atkins, riparian landowners and anglers. Floodplains are an integral part of healthy rivers and floods are a natural occurrence on rivers. The plan was presented to the city council in a study session on april.
Draining an area of over 11,200 square miles, the river supplied water for agricultural, industrial, municipal, and domestic uses in the willamette valley. Floodplain study helps prioritize restoration work. When developing or building within a natural hazard areas, it is important to take precautions and build in compliance with local codes, building codes, and fema regulations in order to protect your investment and your life. On the site of a former lumber mill, the alder creek restoration project is the first. Willamette river studies the willamette river is an important oregon icon and its health is important to our regions livability. Willamette river history development along the willamette river. Eugene delta ponds usace and city of eugene partnership. These maps depict areas of predicted inundation of the willamette river upstream of willamette falls associated with river s regulated 2year discharge. It was wild river and as it passed through eugene took the form of braided channels and a wide floodplain.
You will learn how stream systems are supposed to work, what happened to our stream systems when we began to settle the east coast, and why it is so important. Restoration of gravel mined floodplains willamette valley, oregon. Floodplain restoration success criteria and monitoring. Current understanding and information needs rose wallick dave hulse jim oconnor stan gregory krista jones mackenzie keith charles cannonu. Processes and landforms of the willamette river and floodplain 1. Returning natural functions to restore rivers and benefit communities. We hope to have this bible available by midfebruary 20. The purpose of the riverbend levee setback and floodplain restoration alternatives analysis is to document the methods and results of alternative development, evaluation, and selection. Riparian and floodplain ecosystems are shaped and sustained by the rivers hydrologic processes, such as flooding. The river winds its way through oregons most populous cities including eugene, salem, and portland, in addition to farmlands, forests, and quiet towns. For other areas, approximate data was used to determine the floodplain boundaries on the flood maps. Building riverfront property for fish and wildlife along. Lititz run at oak street floodplain wetland restoration. Natural floodplains provide many benefits to people and nature.
Finley national wildlife refuge and located about 10 miles 16 km south of corvallis in benton county, oregon. Where floodplains are connected to a river and periodically inundated, interactions of land, water, and biology support natural functions that benefi t river ecosystems and people. Why we need to restore floodplains american rivers. Upper willamette river floodplain oregon conservation. Since the end of the 20th century a wide range of river and floodplain restoration projects have been carried out in europe including the restoration of the skjern river in denmark pedersen et al. We incorporated these relationships into an analysis of potential for future restoration in the willamette river. New willamette river flood inundation maps to aid residents. Floodplains in portland live or work in a floodplain.
Geologic interpretation of floodplain deposits of the. The maps provide a tool for identifying restoration opportunities on the willamette floodplain. Whenever possible, floodplain restoration should be a goto solution. The city of lake oswego, oregon scholars bank university of. April 2012 5 restoration sites in the study area albina yard landowner. Bound by the cascade mountain range to the east and the coast range to the west, the willamette basin is the largest watershed entirely con. The mainstem of the willamette river starts in the south end. Swenson, keith whitener, and mike eaton the nature conservancy, cosumnes river preserve, galt, ca 95616 abstract. Coastal and riverine floodplain and stream restoration and stabilization can be successful methods in providing benefits of flood risk reduction and improving water quality and habitat for fish and wildlife, recreational opportunities, and erosion control. We created a spatial framework for the assessment of the river and its floodplain by dividing the area of river that has been inundated between 1850 and the present into 1km slices along the central axis of the channel. Successful integration of aggregate data in landuse planning.
The willamette floodplain consists of 7 acres 289 ha of natural grassland, near the willamette river, that was made a national natural landmark in may 1987. Flooding and change on the willamette river the willamette river like many rivers of the northwest the willamette river once had a very different appearance. When the first settlers arrived in the willamette valley in the mid 1800s, they found a broad valley covered with clusters of oaks, tall fir, and grassy prairies. Floodplain restoration is the process of fully or partially restoring a river s floodplain to its original conditions before having been affected by the construction of levees dikes and the draining of wetlands and marshes. Restoration of gravel mined floodplains willamette valley. Staff can assist with flood protection and mitigation design questions and with local flooding concerns. Willamette floodplain restoration study primary areas formerly gravel mined c1m1, confluence c3r1, row river confluence. A major goal of this work is to restore natural floodplain and inchannel habitat forming processes to provide critical juvenile rearing and adult holding habitat for native fish, including chinook salmon. Flowing northward between the oregon coast range and the cascade range, the river and its tributaries form the willamette. New willamette river flood inundation maps to aid residents and emergency managers release date. The willamettes main stem is 187 miles 301 km long, lying entirely in northwestern oregon in the united states. April, 2016 new flood inundation maps focused on the coast fork willamette river near goshen, oregon were published online wednesday by the u. The river wensum restoration strategy is a longterm project with the vision to restore all 71km of the river wensum sssisac. The river drains a basin of 11,506 square miles, which is roughly the area of both maryland and delaware combined.
Riverine floodplains are dynamic systems that play an important role in the function and ecology of rivers. Lake oswego bridge inspections and records manual this manual. Restoration study bible online yahwehs restoration ministry. Clackamas river bull trout reintroduction feasibility assessment. Floodplain restoration, as described and discussed in this publication, is based on a process that puts the stream channel and floodplain at or very near their historical elevations and locations. The project connected more than 5 former aggregate mining pits to create back and side river channels throughout the site. Draining an area of over 11,200 square miles, the river supplies water for agricultural, industrial, municipal, and domestic purposes in the willamette valley. Mar 17, 2018 the willamette river, in its natural state, has been subject to annual flooding, at times severe. Developed scales of restoration for each site to evaluate via cost effectiveness and incremental analysis minimum scale passive restoration features such as removal of invasive species, riparianfloodplain revegetation, placement of large wood, maximum scale may include channel excavation, engineered log jams, levee or. If this event is canceled do to a continuation of the corona virus covid19 pandemic, we will issue participants a full refund. It includes wetlands and those portions of floodplains and valley bottoms that. Recovery plan for the oregon chub 5 nrimp site index odfw.
Hydrologic control in a willamette river floodplain wetland jim morgan, natural resources program leader, metro regional parks and greenspaces curt zonick, natural resources scientist, metro regional parks and greenspaces most effective manmade designs borrow from natural models. Willamette river history about the watershed the city of. The willamette river, in its natural state, has been subject to annual flooding, at times severe. Located within the study transect is a relict willamette river channel. A spatial assessment of conservation opportunities in the willamette river floodplain between corvallis and albany, oregon abstract the willamette river floodplain has been highly modified by urbanization, conversion of land to agriculture, construction of dams and revetments, and regulation of. Building riverfront property for fish and wildlife along oregons willamette river along the banks of oregons willamette river, noaa and our partners have started building habitat for fish and wildlife, just a few miles downriver from portland, oregon. Willamette river from newberg to portland flows in a basalt trench that was formed by a series of lava flows that date to before the uplift of the northern cascade mountain range. The willamette river, in its natural state, was subject to annual flooding. Heritage foundation willamette river gravel removal fund for compensatory mitigation. Gardiner j l 1999 willamette river floodplain restoration study. Spanning approximately 100 miles over the course of 5 days in august, participants enjoy impromptu performances, like bald eagles grappling for prey with osprey in midflight.
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