Eligibility Descriptions
In order to be listed on the NRI, a river must be free-flowing
and possess one or more Outstandingly Remarkable Values (ORVs).
Thus, the eligibility analysis consists of an examination
of the river's hydrology, including any man-made alterations,
and an inventory of its natural, cultural, and recreational
resources. There are a variety of methods to determine whether
certain resources are so unique, rare or exemplary as to make
them outstandingly remarkable. The determination that a river
area contains ORVs is a professional judgment on the part
of the interdisciplinary study team (IDT), based on objective,
scientific analysis. Input from organizations and individuals
familiar with specific river resources should be sought and
documented as part of the process.
In order to be assessed as outstandingly remarkable, a river-related
value must be a unique, rare, or exemplary feature that is
significant at a comparative regional or national scale. Dictionary
definitions of the words "unique" and "rare"
indicate that such a value would be one that is conspicuous
example from among a number of similar values that are themselves
uncommon or extraordinary. One possible procedure would be
to list all of the river's special values and then assess
whether they are unique, rare or exemplary within the state,
physiographic province, eco region, or the other area of comparison.
Only one such value is needed for eligibility.
The area, region or scale of comparison is not fixed, and
should be defined as that which serves as a basis for meaningful
comparative analysis; it may vary depending on the value being
considered. Typically, a "region" is defined on
the scale of an administrative unit, a portion of a state,
or an appropriately scaled physiographic or hydrologic unit.
While the spectrum of resources that may be considered is
broad, all values should be directly river-related. That is,
they should:
- Be located in the river or on its
immediate shorelands (generally within 1/4 mile on either
side of the river);
- Contribute substantially to the functioning
of the river ecosystem; and/or
- Owe their location or existence to
the presence of the river.
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Outstandingly Remarkable Values (ORVs)
The following eligibility criteria are offered to foster
greater consistency within the federal river-administering
agencies. They are intended to set minimum thresholds to establish
ORVs and are illustrative but not all-inclusive. If utilized
in an agency's planning process, these criteria may be modified
to make them more meaningful in the area of comparison, and
additional criteria may be included.
-
Scenery (S): The landscape elements of landform,
vegetation, water, color, and related factors result in
notable or exemplary visual features and/or attractions.
When analyzing scenic values, additional factors -- such
as seasonal variations in vegetation, scale of cultural
modifications, and the length of time negative intrusions
are viewed -- may be considered. Scenery and visual attractions
may be highly diverse over the majority of the river or
river segment.
- Recreation (R): Recreational opportunities are,
or have the potential to be, popular enough to attract visitors
from throughout or beyond the region of comparison or are
unique or rare within the region. Visitors are willing to
travel long distances to use the river resources for recreational
purposes. River-related opportunities could include, but
are not limited to, sightseeing, wildlife observation, camping,
photography, hiking, fishing and boating.
- Interpretive opportunities may be exceptional and
attract, or have the potential to attract, visitors
from outside the region of comparison.
- The river may provide, or have the potential to provide,
settings for national or regional usage or competitive
events.
- Geology (G): The river, or the area within the
river corridor, contains one or more example of a geologic
feature, process or phenomenon that is unique or rare
within the region of comparison. The feature(s) may be
in an unusually active stage of development, represent
a "textbook" example, and/or represent a unique
or rare combination of geologic features (erosional, volcanic,
glacial, or other geologic structures).
- Fish (F): Fish values may be judged on the relative
merits of either fish populations, habitat, or a combination
of these river-related conditions.
- Populations: The river is nationally or regionally
an important producer of resident and/or anadromous
fish species. Of particular significance is the presence
of wild stocks and/or federal or state listed (or
candidate) threatened, endangered or sensitive species.
Diversity of species is an important consideration
and could, in itself, lead to a determination of "outstandingly
remarkable."
- Habitat: The river provides exceptionally
high quality habitat for fish species indigenous to
the region of comparison. Of particular significance
is habitat for wild stocks and/or federal or state
listed (or candidate) threatened, endangered or sensitive
species. Diversity of habitats is an important consideration
and could, in itself, lead to a determination of "outstandingly
remarkable."
- Wildlife (W): Wildlife values may be judged on
the relative merits of either terrestrial or aquatic wildlife
populations or habitat or a combination of these conditions.
- Populations: The river, or area within the
river corridor, contains nationally or regionally
important populations of indigenous wildlife species.
Of particular significance are species considered
to be unique, and/or populations of federal or state
listed (or candidate) threatened, endangered or sensitive
species. Diversity of species is an important consideration
and could, in itself, lead to a determination of "outstandingly
remarkable."
- Habitat: The river, or area within the river
corridor, provides exceptionally high quality habitat
for wildlife of national or regional significance,
and/or may provide unique habitat or a critical link
in habitat conditions for federal or state listed
(or candidate) threatened, endangered or sensitive
species. Contiguous habitat conditions are such that
the biological needs of the species are met. Diversity
of habitats is an important consideration and could,
in itself, lead to a determination of "outstandingly
remarkable."
- Prehistory (P): The river, or area within the
river corridor, contains a site(s) where there is evidence
of occupation or use by Native Americans. Sites must have
unique or rare characteristics or exceptional human interest
value(s). Sites may have national or regional importance
for interpreting prehistory; may be rare and represent
an area where a culture or cultural period was first identified
and described; may have been used concurrently by two
or more cultural groups; and/or may have been used by
cultural groups for rare sacred purposes. Many such sites
are listed on the National Register of Historic Places,
which is administered by the NPS.
- History (H): The river or area within the river
corridor contains a site(s) or feature(s) associated with
a significant event, an important person, or a cultural
activity of the past that was rare or one-of-a-kind in
the region. Many such sites are listed on the National
Register of Historic Places. A historic site(s) and/or
features(s) is 50 years old or older in most cases.
- Cultural (C): The river or area within the river
corridor contains archaelogical sites or areas significant
to traditional cultures. Examples might be American Indian
burial grounds, petroglyphs, the oldest known human use
site in a region, or streams that support traditional
agriculture, subsistence fishing, or religious ceremonies.
- Other Values (O): While no specific national evaluation
guidelines have been developed for the "other similar values"
category, assessments of additional river-related values
consistent with the foregoing guidance may be developed
-- including, but not limited to, hydrology, paleontology
and botany resources.
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Potential Classification
The Act and Interagency Guidelines provide the following
direction for establishing preliminary classifications for
eligible rivers:
-
Wild rivers (W): Those rivers or sections of rivers
that are free of impoundments and generally inaccessible
except by trail, with watersheds or shorelines essentially
primitive and waters unpolluted. These represent vestiges
of primitive America.
-
Scenic rivers (S): Those rivers or sections of
rivers that are free of impoundments, with shorelines
or watersheds still largely primitive and shorelines largely
undeveloped, but accessible in places by roads.
-
Recreational rivers (R): Those rivers or sections
of rivers that are readily accessible by road or railroad,
that may have some development along their shorelines,
and that may have undergone some impoundment or diversion
in the past.
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