What is a trout stream? It seems like a straight-forward question, but since classification as a trout stream today carries a lot of restrictions for land-owners, it’s anything but.
Check out this detail from the Upper New River basin (yellow) on the border between NC and VA. In NC we’re showing the Division of Water Quality’s data; in VA, we have the VDGIF data. Wouldn’t you expect the streams in VA (marked ?) to be more or less the same as in NC? Obviously, a different definition is at play here.
Sources: Virginia Department of Game and Inland Fisheries (VDGIF),North Carolina Center for Geographic Information and Analysis, 20060209, Statewide 24k hydrography (lines): North Carolina Center for Geographic Information and Analysis, Raleigh, NC; Google Earth
The VA State Water Control Board acknowledges this inconsistency in the Water Quality Standards. All of the VGDIF wts streams are included in their classifications, but they list additional streams (marked with *** in their listings). Unfortunately, they don’t seem to publish GIS data of their streams, but we’ve included a PDF of the current WQS list in the VA Resources Menu.