- How will new data on 24k streams be mapped?
- Where 24k stream layers exist now, why not map new 24k data as lines
along
the stream rather than points?
- What are the target species for this effort?
- Is the 24k Project mapping fish or fish habitat?
- Will the resulting distribution data identify areas that are absent
of salmonids?
How will new data on 24k streams be mapped?
Until there is a consistent 24k stream layer, new 24k data will be
mapped as points along the 24k stream. Each point will represent either
the upper extent of distribution or a break in the distribution use-type.
Where 24k stream layers exist now, why not map new 24k data as lines
along
the stream rather than points?
It is true that 24k stream layers (hydrography) do exist for many areas of
the state, but the hydrography is not consistent between these areas. The
final format has yet to be adopted, and until it is, it would be more work to
use the varied formats that exist to create the lines and then convert them
to the new format once it is adopted. It will be much more efficient to
convert the points to lines after the hydrography format has been finalized,
because that way it will need to be done only once.
In the interim, once we finalize the point data, it will be made publicly
available. Where routed hydrography does exist, the data can be converted
into linear events or coverages by those who would prefer it in that format.
As time permits under this project, we will work to convert as much of this
data as possible into a linear format where the route systems are stable and
consistent relative to this data.
What are the target species for this effort?
All salmonids (except sea-run or resident cutthroat) occurring within the
areas of the state where anadromous fish are found - these areas are referred
to as the anadromous zones of Oregon. The species would include Chinook
(spring, summer, & fall), Steelhead (winter and summer), Coho, Bull
Trout, Chum, resident Rainbow (when they can be distinguished from
steelhead), and other lesser distributed salmonid species where they
occur.
Is the 24k Project mapping fish or fish habitat?
The short answer is both. Our distribution represents areas of
suitable habitat currently believed to be utilized by wild/natural,
native, and/or hatchery fish populations. The term "currently" is defined
as within the past five reproductive cycles. This information can either
be based on documented fish observations or best professional judgment
of habitat or fish presence.
Will the resulting distribution data identify areas that are absent
of salmonids?
Yes, but only above confirmed fish passage barriers, and only if access to
the area is believed to have been cut off prior to European settlement. If
access was cut off after European settlement, the distribution will be mapped
in the "Previous/Historic" category.
|