Abstract: Limited distribution of Oregon resident trout (1:24,000 scale) These data describe areas of suitable habitat believed to be used (currently and historically) by wild, natural, and/or hatchery fish populations at the 1:24,000 scale. The term "currently" is defined as within the past five reproductive cycles. See the USETYPE field description to differentiate between current and historic distribution. This information is based on the observations and best professional judgment of ODFW staff biologists and where possible, the observations and professional opinions of staff from other natural resource entities. Each point represents the uppermost extent of habitat distribution. Please consult the QUALITYCRI item for the data contributor's confidence in the information. Due to natural variations in run size, water conditions, or other environmental factors, some areas displayed may not be used by a species of fish on an annual basis. Streams that have no data associated with them are considered UNKNOWN for species presence and/or absence. To date, the acquisition of resident trout distribution data has been incidental to the collection of anadromous salmon and steelhead habitat distribution. For this reason, the trout data presented here should in no way be considered comprehensive for the entire anadromous zone. The usetypes represented in the attribute table are subject to change when suitable definitions for resident fish habitat use are agreed upon within the scope of this project. Documentation information (e.g. mapped fish survey locations) currently exists and can be located under the "Observations/Sightings" heading at http://osu.orst.edu/dept/nrimp/information/index.htm. There are a limited number of cases where documented observation extends above (upstream of) the distribution data. Based on a preliminary review, NRIMP has decided not to extend the distribution data for these records pending more thorough evaluation of each individual case. For example, the documentation record may be based on a ground measurement, such as 'rivermile,' which doesn't translate accurately into the GIS. The ground measures, in particular for streams of significant length, can sometimes be greater than the GIS measures that are built into the 100K stream route system.
Purpose: To map resident Oregon trout habitat distribution at the 1:24,000 scale, including rainbow, redband, brook, and hybridized rainbow and cutthroat trout species. Limitations_of_Data: These data only represent distribution at the 1:24,000 scale. Please consult the 1:100,000 scale datasets to obtain a more comprehensive (but still limited) version of fish habitat distribution for these species. The 100K data are available in coverage and shapefile format and can be accessed at http://osu.orst.edu/dept/nrimp/information/fishdistdata.htm. Because the acquisition of resident trout distribution information has been incidental to the collection of anadromous fish species information, these data are not comprehensive for the entire Oregon anadromous zone. Not all data are based on direct observations. See the quality criteria item (QUALITYCRI) for the varying levels of confidence in the data. Historic distribution presented here should in no way be considered comprehensive for all anadromous zones. Historic information was collected peripherally and incidentally to current distribution information. Entity_and_Attribute_Overview Procedures_Used: These data were created through a process where 1:100,000 scale hydrography information was plotted by 7.5 minute USGS 1:24,000 quadrangle pair and then provided to ODFW and other natural resources agency field staff for review. Existing electronic species distribution, documentation, barriers, and dams were also plotted on the quad pairs. Based on survey data, supporting documentation, and the best professional judgment of the field biologists, the distribution of habitat use (see the USETYPE field) was marked on the maps with colored pens. These hardcopy data were then heads-up digitized by ODFW GIS staff using the digital raster graphic (DRG) files as backdrop, and stored as shapefiles. The shapefiles were converted into coverage format using the SHAPEARC command. The attribute information is stored in a MS Access database and linked to the shapefile points via the ID item. Revisions: This is the first official release of these data, although data collection commenced in 2001. Further maintenance and updates will only occur as funding allows. Potentially, these points will be converted to linear events (and arcs) when the 1:24k routed hydrography becomes available for Oregon. Reviews_Applied_to_Data: All distribution data have been reviewed at least twice by ODFW field staff (typically district biologists) in the hardcopy stage. The electronic datasets have not been officially reviewed. The date of revision exists in the attribute table for each distribution record (see the DATECOLLEC item). Related_Spatial_and_Tabular_Data_Sets: -Supplemental 1:100,000 scale distribution GIS data (arcs--coverages and/or shapefiles) at http://osu.orst.edu/dept/nrimp/information/fishdistdata.htm -BAR_PTS Coverage and/or shapefile: Passable and impassable barriers to anadromous salmonid migration (use the related fish barrier table-- bar_fb.dbf--to identify impassable and partially passable barriers). http://osu.orst.edu/dept/nrimp/information/index.htm -DAM_PTS Coverage and/or shapefile: Passable and impassable dams to anadromous salmonid migration (use the related fish barrier table-- bar_fb.dbf--to identify impassable and partially passable dams). http://osu.orst.edu/dept/nrimp/information/index.htm -Fish Observations/Sightings GIS data (coverage and/or shapefile) http://osu.orst.edu/dept/nrimp/information/fishsightingsdata.htm References_Cited: The data contributor's name (biologist), agency, and confidence in the data are present for each distribution record. The item, REFID, can be used to locate the contact information for each data source (contact the data administrator for access to the reference information). Notes: Please direct all questions and comments regarding this metadata or the datsets it describes to Jon Bowers, 503-872-5255 x5603, after December 20, 2002.
Supplemental Information: Procedures_Used Revisions Reviews_Applied_to_Data Related_Spatial_and_Tabular_Data_Sets References_Cited Notes

Progress:
Update Frequency: Maintenance of these data will be ongoing as funding allows. However, no official maintenance/update plan exists at this time.

Theme Keywords: None, fish distribution , trout, biota
Place Keywords: Limited data exists throughout Oregon anadromous zone

Access Constraints: None.
Usage Constraints: