2003110416003600FALSE20040309134949002004030913503200{F5B7922C-EA5E-4D18-B6DA-2E440F10CD7B}Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700enA two-week field operation was conducted in the John Day Reservoir on the Columbia River to image the floor of the pool, to measure the distribution and thickness of post-impoundment sediment, and to verify these geophysical data with video photography and bottom sediment samples. The field program was a cooperative effort between the USGS Coastal and Marine Geology Team of the Geologic Division and the USGS Columbia River Research Laboratory of the Biological Resources Division. The data collection was completed aboard the R/V ESTERO during September 13-27, 2000. The interest in sediment accumulation in the reservoir was two-fold. First, it was unknown how effective this reservoir was as a sediment trap to material that otherwise would have been transported down-river to the estuary and eventually to the ocean. The recent erosion of beaches along the Washington coast has been attributed to a decreased contribution of sediment from the Columbia River to the coastal system due to the damming of the river. Second, sediment accumulation on the floors of reservoirs along the Columbia River has been suggested to be diminishing salmon spawning grounds. The extent of changes in habitat since construction of the John Day Dam, however, had not been documented. Common data sets were needed to address both of these questions, and for these reasons this geophysical and sampling program was undertaken.The chirp seismic-reflection profiles were collected to measure the thickness and distribution of sediment that has accumulated in the John Day Reservoir since impoundment in 1968. VeeAnn A. Cross2004tracklinesvector digital dataDavid C. TwichellVeeAnn A. CrossDavid C. Twichell2004Open-File Report2004-1014Woods Hole Science Center, Woods Hole, MAU.S. Geological Survey ground condition2000091120000922CompleteNone planned-120.684160-119.32590045.93246045.688390-120.684160-119.32590045.68839045.932460GeneralArcViewchirpCMGPCoastal and Marine Geology Programnavigationseismicseismic-reflectionshapefileSIS-1000U.S. Geological SurveyUSGSWoods Hole Science CenterreservoirsidescansedimentOpen-File ReportOF 2004-1014GeneralNorth AmericaUnited StatesWashingtonOregonColumbia RiverJohn Day ReservoirJohn Day DamMcNary DamLake UmatillanoneThe U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.ShapefileVeeAnn A. CrossU.S. Geological SurveyMarine Geologistmailing and physical address

384 Woods Hole Rd.

Woods HoleMA02543-1598(508) 548-8700 x2251(508) 457-2310vatnipp@usgs.govMicrosoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700tracklines-120.68416-119.325945.9324645.688391-120.68416-119.325945.9324645.688391enFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeVeeAnn A. CrossU.S. Geological SurveyMarine Geologistmailing and physical address

384 Woods Hole Rd.

Woods HoleMA02543-1598(508) 548-8700 x2251(508) 457-2310vatnipp@usgs.gov20040309http://www.esri.com/metadata/esriprof80.htmlESRI Metadata ProfileISO 19115 Geographic Information - MetadataDIS_ESRI1.0datasetDownloadable Data0.3440.344SHAPEFILEVeeAnn A. CrossU.S. Geological SurveyMarine Geologistmailing and physical address

384 Woods Hole Rd.

Woods HoleMA02543-1598(508) 548-8700 x2251(508) 457-2310vatnipp@usgs.govThese data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.002file://\\REDHOOK\johnday_ofr\data\nav\tracklines.shpLocal Area Network0.344ShapefileVectorSimplePolylineFALSE44FALSEFALSEString44GCS_North_American_1983Decimal degrees0.0000000.000000North American Datum of 1983Geodetic Reference System 806378137.000000298.257222GCS_North_American_198344tracklinesFeature Class44FIDFIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeShapeGeometry000Feature geometry.ESRICoordinates defining the features.LINENUMLINENUMNumber6Numeric value indicating the line number the polyline represents.user defined140FILENAMEFILENAMEString16String indicating the filename to which the logged data was recorded.user definedcharacter setHOTLINKHOTLINKString50String field indicating the location of the images to hotlink to each line. Has a variable for the initial part of the path.user definedcharacter setFIRERATEFIRERATEString16String representing the fire rate (in seconds) of the acquisition system.system definedcharacter setSWATHSWATHNumber16Total swath coverage (in meters) of the acquisition system at a given fire rate.system defined.800120020040309The SIS-1000 system acquires chirp sidescan-sonar and chirp seismic-reflection data. Navigation is merged with these data. Since one system acquires both sets of data, only one trackline file is needed. In this case, the navigation extraced from the sidescan-sonar data was reformatted and converted to an Arc ungenerated format using awk scripts.2000This ungenerate file (polyline format) was then imported into ArcView3.2 using an avenue script.Additional attributes were added to the table of the shapefile to further describe each line of data, as well as allow hotlinking to seismic-reflection profile images.The navigation was collected with a P-Code plugger navigation system. Although the navigation antenna was mounted on the ship rather than the towfish, the system was towed shallow and extremely close to the boat therefore making the "layback" error negligible. Because of the high fire rates of the system, each "shot" does not have a navigation point, therefore these values have to be interpolated. 20m