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Flood-Inundation Maps for a 9.1-Mile Reach of the Coast Fork Willamette River Near Creswell and Goshen, Lane County, Oregon: U.S

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Flood-Inundation Maps for a 9.1-Mile Reach of the Coast Fork Willamette River Near Creswell and Goshen, Lane County, Oregon: U.S Prepared in cooperation with the U.S. Army Corps of Engineers, Portland District Flood-Inundation Maps for a 9.1–Mile Reach of the Coast Fork Willamette River near Creswell and Goshen, Lane County, Oregon Scientific Investigations Report 2016–5029 U.S. Department of the Interior U.S. Geological Survey Cover: Photograph showing Coast Fork Willamette River and gage house at State Highway 58 near Goshen, Oregon, on December 18, 2015, when measured streamflow was 11,700 cubic feet per second. Photograph credit: U.S. Geological Survey. Flood-Inundation Maps for a 9.1–Mile Reach of the Coast Fork Willamette River near Creswell and Goshen, Lane County, Oregon By Glen W. Hess and Tana L. Haluska Prepared in cooperation with the U.S. Army Corps of Engineers, Portland District Scientific Investigations Report 2016–5029 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior SALLY JEWELL, Secretary U.S. Geological Survey Suzette M. Kimball, Director U.S. Geological Survey, Reston, Virginia: 2016 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit http://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod/. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Hess, G.W., and Haluska, T.L., 2016, Flood-inundation maps for a 9.1-mile reach of the Coast Fork Willamette River near Creswell and Goshen, Lane County, Oregon: U.S. Geological Survey Scientific Investigations Report 2016–5029, 8 p., http://dx.doi.org/10.3133/sir20165029. ISSN 2328-0328 (online) v Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................1 Purpose and Scope ..............................................................................................................................4 Description of Study Area ...................................................................................................................4 Previous Studies ...................................................................................................................................4 2013 Flood Insurance Study .......................................................................................................4 Water-Surface Profiles and Stage-Discharge Ratings ...........................................................................6 Development of Flood-Inundation Maps ...................................................................................................6 Coast Fork Willamette River, Oregon, Flood-Inundation Maps on the Internet .........................7 Disclaimer for Flood-Inundation Maps .............................................................................................7 Uncertainties and Limitations for Flood-Inundation Maps ............................................................7 Summary..........................................................................................................................................................8 Acknowledgments .........................................................................................................................................8 References Cited............................................................................................................................................8 Figure 1. Map showing location of study reach along the Coast Fork Willamette River near Goshen, Oregon, and location of U.S. Geological Survey (USGS) streamgage and National Weather Service (NWS) forecast site ......................................................................2 Tables 1. Site information for the U.S. Geological Survey streamgage 14157500, Coast Fork Willamette River Basin near Goshen, Oregon .........................................................................3 2. Surveyed high-water mark elevations and hydraulic-model elevations from the flood of January 2006, Coast Fork Willamette River near Goshen, Oregon ........................5 3. Water-surface elevations from flow rating table and U.S. Army Corps of Engineers hydraulic model for the streamgage at the Coast Fork Willamette River near Goshen, Oregon (14157500) .........................................................................................................6 vi Conversion Factors Inch/Pound to SI Multiply By To obtain Length foot (ft) 0.3048 meter (m) mile (mi) 1.609 kilometer (km) Area square mile (mi2) 2.590 square kilometer (km2) Flow rate cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s) Hydraulic gradient foot per mile (ft/mi) 0.1894 meter per kilometer (m/km) Datums Vertical coordinate information is referenced to either (1) stage, the height above an arbitrary datum established at a streamgage, or (2) elevation, the height above North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Flood-Inundation Maps for a 9.1-Mile Reach of the Coast Fork Willamette River near Creswell and Goshen, Lane County, Oregon By Glen W. Hess and Tana L. Haluska Abstract Introduction Digital flood-inundation maps for a 9.1-mile reach The Coast Fork Willamette River joins the Middle Fork of the Coast Fork Willamette River near Creswell and Willamette River to form the Willamette River upstream of Goshen, Oregon, were developed by the U.S. Geological the population center of Springfield and Eugene, Oregon Survey (USGS) in cooperation with the U.S. Army Corps (population 351,715; U.S. Census Bureau, 2012) in Lane of Engineers (USACE). The inundation maps, which can be County. The Coast Fork Willamette River contributes to accessed through the USGS Flood Inundation Mapping flooding in the Springfield-Eugene area and may flood the Science Web site at http://water.usgs.gov/osw/flood_ community of Creswell, which is located along its banks inundation/, depict estimates of the areal extent and depth (fig. 1). The U.S. Army Corps of Engineers (USACE) of flooding corresponding to selected stages at the USGS operates dams that regulate flow of the Coast Fork streamgage at Coast Fork Willamette River near Goshen, Willamette River and has conducted studies to calculate Oregon (14157500), at State Highway 58. Current stage the flood frequency and inundation areas along the Coast at the streamgage for estimating near-real-time areas of Fork Willamette River. Based on the these studies, the U.S. inundation may be obtained at http://waterdata.usgs.gov/or/ Geological Survey (USGS), in cooperation with USACE, nwis/uv/?site_no=14157500&PARAmeter_cd=00065,00060. developed flood inundation maps that focus on the area near In addition, the National Weather Service (NWS) forecasted the USGS streamgage on the Coast Fork Willamette River peak-stage information may be used in conjunction with the near Goshen (14157500). maps developed in this study to show predicted areas of flood Development on flood plains within the study area is inundation. varied, with a mix of residential, recreational, and In this study, areas of inundation were provided commercial structures, and areas of agriculture, grass fields, by USACE. The inundated areas were developed from wetlands, and forest. Since 1967, two U.S. Army Corps of flood profiles simulated by a one-dimensional unsteady Engineers dams regulate flow and provide flood control in the step-backwater hydraulic model. The profiles were checked Coast Fork Willamette River—the Cottage Grove Dam on by the USACE using documented high-water marks from a the Coast Fork Willamette River and the Dorena Dam on the January 2006 flood. The model was compared and quality Row River, a tributary to the Coast Fork Willamette River. assured using several other methods. The hydraulic model These two projects reduce much of the flooding immediately was then used to determine eight water-surface profiles at downstream and, in concert with dams on the Middle Fork various flood stages referenced to the streamgage datum and Willamette River, reduce flood risk in the highly developed ranging from 11.8 to 19.8 ft, approximately 2.6 ft above the Eugene-Springfield area. highest recorded stage at the streamgage (17.17 ft) since Prior to this study, officials from Lane County and the 1950. The intervals between stages are variable and based Cities of Creswell and Goshen relied on several information on annual exceedance probability discharges, some of which sources to make decisions on how best to alert the public approximate NWS action stages. about and mitigate flooding along the Coast Fork Willamette The areas of inundation and water depth grids provided River. One source of information is the Federal Emergency to USGS by USACE were used to create interactive Management Agency (FEMA) Digital Flood Insurance flood-inundation maps. The availability of these maps with Rate Map (Federal Emergency Management
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