U.S. Geological Survey 2010 vector digital data Portland, OR U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?umpqua_River_Oregon_Active_Channel_1939 J. Rose Wallick Jim E. O'Connor Scott Anderson Mackenzie Keith Charles Cannon John Risley 2010 document Wallick, J.R., O'Connor, J.E., Anderson, Scott, Keith, Mackenzie, Cannon, Charles and Risley, John, 2010, Channel change and bed-material transport, Umpqua River, Oregon: U.S. Geological Survey Open-File Report 2010-1314. https://pubs.usgs.gov/of/2010/1314/ The Umpqua River drains 12,103 square kilometers (4,673 square miles) in southwest Oregon before flowing into the Pacific Ocean at Winchester Bay near the city of Reedsport. In cooperation with the Portland District of the U.S. Army Corps of Engineers (USACE), the USGS evaluated sediment transport and gravel storage along the downstream alluvial reaches of the North and South Umpqua Rivers and the entire mainstem Umpqua River. This includes the lower 46.8 kilometers (29.1 miles) of the North Umpqua River and the lower 122.6 kilometers (76.2 miles) of the South Umpqua River. The Umpqua River gravel transport study involved multiple analyses, including tracking patterns of historical channel change and estimation of a sediment budget. To support these analyses, digital channel maps were produced to depict channel and floodplain conditions along the Umpqua River system from different time periods. GIS layers defining the active channel of the Umpqua River system were developed for three time periods: 1939, 1967, and 2005. For the South Umpqua River and the 19 kilometers (12 miles) of the mainstem Umpqua River downstream from the confluence of the North and South Umpqua Rivers, GIS layers were also developed for the time periods 1994, 2000, and 2009. For this project, the active channel was defined as area typically inundated during annual high flows, and includes the low-flow channel as well as side channels, islands, and channel-flanking gravel bars. The active channel datasets were developed by digitizing from aerial photographs. Aerial photographs from 1939 and 1967 were scanned, rectified, and mosaiced for this project. Digital orthophotographs from 1994, 2000, 2005, and 2009 are publicly available (See metadata for each photograph set for more information on the rectification process and resolution of each dataset). Although our study area encompasses the Umpqua River and lower reaches of the North and South Umpqua Rivers, the extent of each dataset depended upon the underlying aerial photographs; for example, the 1967 photographs extend only as far downstream as floodplain kilometer 7, whereas the 1939 and 2005 datasets extend to the mouth of the Umpqua River at the Pacific Ocean. These data were created to support the evaluation of sediment transport and gravel storage in the alluvial reaches of the Umpqua River system, Oregon. This mapping was used to track changes in channel morphology over time and to measure changes in gravel bar area and channel position. 1939 Ground condition Complete None planned -124.210823 -122.934737 43.755980 42.920612 USGS Thesaurus inlandWaters fluvial geomorphology active channel ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Metadata Identifier USGS:26241805-af5a-4f89-ac5e-fc38774c6b1c Geographic Names Information System Umpqua River Douglas County Oregon None The U.S. Geological Survey should be acknowledged as the data source in products derived from these data. Charles Cannon U.S. Geological Survey Hydrologic Technician mailing address

2130 SW 5th Avenue

Portland OR 97201 USA (503) 251-3273 N/A (503) 251-3470 ccannon@usgs.gov (Warning: Although accurate at the time of production, this information may have become obsolete. See the Metadata_Reference_Information section for a current contact.) https://water.usgs.gov/GIS/browse/Umpqua_River_Oregon_Active_Channel_1939.jpg Illustration of data set JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500 All active channel mapping was reviewed by a minimum of two other team members to ensure protocol was followed and that mapping was consistent between time periods. Data are topologically correct in ArcGIS. Topology rules were used to edit features and verify that polygons were completely enclosed. Sliver polygons were manually removed. Data are complete. Digitizing was done at a scale of 1:3,000, except for the Tidal Reach, which was digitized at a scale of 1:10,000. The Tidal Reach was mapped at a smaller scale because the bar and channel features were much larger than in the other reaches. All features greater than 300 square meters and clearly visible at digitizing scale were digitized. Because the polygons were split for assignment to study reaches, some may represent areas less than 300 square meters. Where active channel features were obscured by vegetation or shadows, best judgment was used to delineate the feature boundary. Varied stream discharge on different acquisition dates and misalignment from registration errors occasionally resulted in discontinuity of active channel features where the base photographs overlap. For these instances, the features were digitized as seen in the base photograph. Mean daily discharges for the dates of photo acquisition and the root mean square error of image registration are included in the 'Umpqua_River_Oregon_Photo_Data_1939' feature dataset. The 1939 photographs were generally registered with 9 to 13 ground control points. The number of control points used ranged from 4 to 18. Root mean square error was generally between 2.4 and 6.6 meters, and ranged from 0.5 to 13.2 meters. Spot checks comparing the 1939 mosaics to NAIP digital orthophotographs from 2005 suggest that errors in image alignment are generally less than 14 meters, but may be as high as 36 meters. Digitization was done at a scale of 1:3,000, except for the tidal reach, which was digitized at a scale of 1:10,000. Surdex Corporation, Chesterfield, MO 2006 remote-sensing image aerial photography 20050717 20050804 Ground condition NAIP 2005 Base image for interpretation U.S. Army Corps of Engineers Unpublished Material remote-sensing image 10,200 paper 19390517 19390720 Ground condition USACE 1939 Photographs were mosaiced and used as a Base image for interpretation Digitizing: Features seen in aerial photographs were outlined using a polyline feature class. The outline was drawn to represent the feature as seen at a scale of 1:3,000 (1:10,000 for features within the tidal reach). NAIP 2005 USACE 1939 2010 Points within a feature class containing the attributes for the features were digitized in each enclosed area. 2010 An ESRI geodatabase topology rule of "no dangles" was used for editing. This required that both ends of every line connected to another line and ensured that all polygons were completely enclosed. 2010 The line and point feature classes were converted to polygons using the "Feature To Polygon" tool in ArcToolbox. 2010 The "Dissolve" tool in ArcToolbox was used to remove adjacent polygons with the same attributes. 2010 The polygons were intersected with a polygon feature class of our study reaches to limit mapping to a common extent and to populate polygons with the appropriate reach name. 2010 Vector G-polygon 1385 Universal Transverse Mercator 10 0.999600 -123.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000100 0.000100 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Umpqua_River_Oregon_Active_Channel_1939 Umpqua River active channel features U.S. Geological Survey OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. Type Geomorphic classification of channel features U.S. Geological Survey Channel The wetted perimeter of the channel seen in aerial photographs. At locations where the wetted perimeter was obscured by vegetation or shadows, best judgment was used to delineate the channel boundary. U.S. Geological Survey Secondary water feature Open water generally associated with alluvial features that does not convey the majority of flow. Most secondary water bodies were associated with alluvial features such as gravel bars or islands and could be classified as secondary channels, backwater sloughs or disconnected water bodies adjacent to alluvial features. A secondary channel is defined as a channel smaller than the main channel that conveys a smaller portion of the flow and is connected to the primary channel at both ends. Backwater features were generally abandoned secondary channels that were partially filled with sediment. Disconnected water bodies were typically floodplain ponds. Open water bodies that appeared on or near bedrock outcrops were not generally classified as secondary water features, because they typically represented inundated potholes or fractures in the bedrock. Exceptions to this rule were particularly large backwater areas and secondary channels located near bedrock outcrops which were mapped as secondary water features. U.S. Geological Survey Attached bar Areas of exposed bed-material sediment that share a margin with the floodplain. Attached bars encompassed a range of features from thin patches of gravel overlying bedrock outcrops to large point bars and lateral bars. In many areas, it was difficult to distinguish bedrock from sediment in the aerial photographs, so differences in the tone and texture of features was used to discern the bar outline. Additionally, vegetation was used as a distinguishing characteristic because it was assumed that if an area could support vegetation, it was most likely mantled in sediment. Only the lower-lying portions of the bars that contained exposed sediment and appeared to be inundated on a near annual basis were digitized. Attached bars were often inset against higher-elevation terraces and floodplain features, with mature vegetation populating the older, higher surfaces, whereas the active surfaces had less vegetation and often had a lighter tone in the aerial photographs. At several locations, attached bars with mature vegetation were surrounded by active channel features, and were included within the bar classification. Attached bars may include open water and bedrock outcrops less than 300 square meters that were not differentiated from the main bar outline. U.S. Geological Survey Medial bar Areas of exposed bed-material sediment that are completely surrounded by water. Although some medial bars appeared to be composed entirely of sediment, field observations showed that other medial bars had a thin mantle of sediment overlying bedrock. Hence, a designation of 'medial bar' does not have any implications as to the thickness of the deposited sediment. For this mapping, no distinction was made as to whether or not the bar consisted of gravel, sand, or mud. In many areas, it was difficult to distinguish bedrock from sediment in the aerial photographs, so differences in the tone and texture of features was used to discern sediment from bedrock. Vegetation was used as a distinguishing characteristic, because it was assumed that if an area could support vegetation, it was most likely mantled with sediment. Medial bars may include open water and bedrock outcrops less than 300 square meters that were not differentiated from the main bar outline. U.S. Geological Survey Bedrock outcrop Exposed bedrock within the active channel. This class includes islands and outcrops adjacent to the wetted channel. For outcrops adjacent to the primary channel, areas of 'bare' bedrock were delineated by drawing boundaries between the edge of the wetted channel and dense vegetation bordering the outcrop. Bedrock was only delineated if it was not covered by vegetation. Distinguishing bedrock from sediment was difficult in some locations, but in other places, the bedrock could be easily differentiated from gravel bars by parallel ridges and fractures in the bedrock and by the jagged, irregular borders of the outcrops. When in doubt about whether a feature was bedrock or a sediment deposit, it was often assumed that if the feature is bedrock in the National Agriculture Imagery Program color aerial photographs from 2005, it was bedrock in previous times also. Because of their higher resolution, it was easier to distinguish bedrock from sediment in the photographs from 2005. Exceptions to this assumption were where gravel-mantled bedrock was clearly visible in the photograph and where erosion of deposited sediment had clearly occurred. Where exposed bedrock extended outside of the active channel, its boundary was determined by tonal differences, with bedrock within the active channel generally having a lighter tone than areas not subject to inundation and scour. In some areas, bedrock outcrops were interspersed with water or sediment. Where this was observed, the polygon was delineated as whichever feature occupied more than 50 percent of the area. Therefore, some bedrock polygons include areas of water, or small patches of sediment. Ponded water was present along many bedrock outcrops generally as shallow puddles in fractures and potholes in the bedrock and during low flows were isolated from the main flow of the channel. U.S. Geological Survey Other Feature within the active channel that does not meet criteria of other geomorphic classifications U.S. Geological Survey Year The year that aerial photographs used for base imagery were acquired. U.S. Geological Survey 1939 Year represented by mapping U.S. Geological Survey Channel The channel a geomorphic feature is associated with. U.S. Geological Survey Tributary Tributaries are channels that originate outside of the floodplain boundary and connect to the primary channel at their downstream end. Features along these streams were classified as belonging to a tributary channel. U.S. Geological Survey Primary channel The primary channel is the channel which carries the majority of flow within the Umpqua, South Umpqua, and North Umpqua Rivers. Features along these rivers were classified as belonging to the primary channel. U.S. Geological Survey Other Features not associated with channel processes. U.S. Geological Survey Vegetation Land cover classification of alluvial surfaces. Bars were divided and classified as having bare (< 10 %), moderate (10-50 %), or dense (> 50 %) vegetative cover. The vegetation classification for developed areas on bars is 'NA'. Vegetation was classified by visual interpretation from aerial photographs. Vegetation was identified by a dark tone and coarse texture. No distinction of vegetation type was made. U.S. Geological Survey Bare Alluvial surface with less than 10 percent vegetative cover U.S. Geological Survey Moderate Alluvial surface with 10 to 50 percent vegetative cover U.S. Geological Survey Dense Alluvial surface with greater than 50 percent vegetative cover U.S. Geological Survey NA Non-alluvial surface or developed area U.S. Geological Survey Reach Study reach that a feature is part of. Not all active channel layers have all six reaches as enumerated in the attribute domain values. This database has been designed to accommodate updates which may include data for any or all reaches. U.S. Geological Survey Tidal Umpqua River from its mouth at the Pacific Ocean to near Scottsburg (floodplain kilometer 0 to 40.9; river mile 0 to 28) U.S. Geological Survey Coast Range Umpqua River confined valley between Scottsburg and east edge of the Coast Range: (floodplain kilometer 40.9 to 152.9; river mile 28 to 100) U.S. Geological Survey Garden Valley Umpqua River from the east edge of the Coast Range to the confluence of the South and North Umpqua Rivers: floodplain kilometer 152.9 to 169.2 (river mile 100 to 111.8) U.S. Geological Survey Roseburg South Umpqua River from confluence of the South and North Umpqua Rivers to the Cow Creek confluence: floodplain kilometer 169.2 to 231.7 (river mile 111.8 to159) U.S. Geological Survey Days Creek South Umpqua River from the Cow Creek confluence to upstream of Tiller: floodplain kilometer 231.7 to 275 (river mile 159 to 188.2) U.S. Geological Survey North Umpqua North Umpqua River from the confluence with the South Umpqua River to the Little River confluence: floodplain kilometer 0 to 44.4 (river mile 0 to 29.1) U.S. Geological Survey SHAPE_Length Length of feature in meters. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in meters squared. ESRI Positive real numbers that are automatically generated. U.S. Geological Survey Michael Ierardi IT Specialist mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ESRI Geodatabase Feature Class PKZIP compression Winzip 1000 https://water.usgs.gov/GIS/dsdl/ofr2010-1314/Umpqua_River_geomorphology_study.zip None. This dataset is provided by USGS as a public service. 20201117 U.S. Geological Survey Michael Ierardi IT Specialist mailing and physical address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998