Does anyone know where I can find good contour layers for Oregon?
I do not have spatial analyst, so I can not make my own.
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You can make you own with a really straightforward workflow and a couple of free gdal tools
1) download the SRTM data from http://dwtkns.com/srtm/
2) merge multiple tifs into one
gdal_merge.py -a_nodata -32768 -o output.tif tiff1.tiff tiff2.tiff ..
3) make your own contours
gdal_contour -a elevation -i 10 output.tif oregan.shp
The Oregon Spatial Data Library (search for contour) has 100ft & 500ft contours available as shape files. They are split up into 9 sections to keep the sizes down.