MidCoast Watersheds Council :: Basin Browser Metadata

Basin Browser Metadata

The MidCoast Watersheds Basin Browser is a static web application built with ArcGIS 8.1.2, Alta4's HTML ImageMapper 8.1, Access 2000, and Adobe Acrobat 5.0. The underlying data is largely derived from the MidCoast Watersheds Council's Sixth Field Watersheds Assessment supplemented with additional data from state and federal agencies.

When the reports refer to benchmarks or desirable conditions, they are referring to the Oregon Department of Fish and Wildlife habitat quality benchmarks as outlined in the GWEB/OWEB Oregon Watershed Assessment Manual.

A brief description of the data used on the text portions of the subbasin reports (PDF files) follows:

Data used on the report maps includes:

Data	Description
5th Field Watersheds	5th field watershed outlines and descriptions were taken from the assessment.
6th Field Watersheds, area, & HUC's	6th field watersheds were the base unit for the assessment.
Stream Length @ 1:100K scale	Stream length @ 1:100K scale provides a base stream layer with coverage for the complete assessment area, however, it has relatively low resolution and underestimates stream length by a large margin when compared to 1:24,000 streams layers.
Oregon BLM GIS	Road density was calculated by using the BLM roads layers for the Eugene and Salem districts. The layers were merged, then clipped and summarized by sixth field. This measure is approximate due to variation in the underlying data sources and should be used with great caution. The assessment did not use this data.
Length Surveyed	Total stream length of aquatic habitat inventories on streams in each subbasin was calculated for all agencies/protocols. This measure is approximate due to variation in the underlying data sources and should be used with great caution.
Average Large Wood Assessments	Average density of large wood in streams in each subbasin was calculated for all agencies/protocols (where possible).
Average Shade Assessments	Average percent shade along streams in each subbasin was calculated for ODFW and Lincoln Soil and Water Conservation District surveys.
Survey Length Index	The Survey Length Index is the ratio of the total surveyed stream length in a subbasin to the total stream length on the 1:100K scale streams layer. This index does not precisely indicate the fraction of streams that have been surveyed but does give a rough estimation of how thoroughly the streams in an area have been surveyed.
Number of Pools Surveyed	The number of pools surveyed in the snorkel surveys of 1998-1999.
Average Coho Density	Average Coho juvenile density in the snorkel surveys of 1998-1999.
Average Complexity	Average pool complexity in the snorkel surveys of 1998-1999, with 1 representing no complexity and 5 representing very high complexity.
DEQ Online 1998 303(d) list coverages	303(d) listed streams and lakes were identified by intersecting the Oregon DEQ's coverages of listed streams and lakes with the 6th field watersheds and adding an internal table to the Basin Browser application to identify subbasins with listed waterbodies. For more information, consult the DEQ's 303(d) list as the document of record.

Data	Description
Coho Density per Pool	Pools are placed along the streams and shaded to indicate relative coho juvenile density. The shapefiles are available for download from the source page.
5th and 6th field watersheds	See above table.
Siuslaw Nat'l Forest Densified Streams and National Hydrography Dataset	The streams layer is produced by the Siuslaw National Forest and has accurate to 1:24,000 scale.
2000 US Census TIGER	Roads were extracted from the US Census Bureau's 2000 Topologically Integrated Geographic Encoding and Referencing line files. TIGER lines were used because of their high quality name data for ease of labeling.
City and County Outlines	City and County boundaries were downloaded from the Oregon Geospatial Data Clearinghouse; city outlines are 1:24,000 scale while county outlines are 1:100,000 scale.