ENVIRONMENTAL CONSEQUENCES
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METHODS FOR ASSESSING IMPACTS
Historic Structures / Buildings
Definitions of Intensity Levels
In order for a structure or building to be listed in the NRHP, it must meet one
or more of the following criteria of significance: (1) associated with events
that have made a significant contribution to the broad patterns of our history;
(2) associated with the lives of persons significant in our past; (3) embody the
distinctive characteristics of a type, period, or method of construction, or
represent the work of a master, or possess high artistic value, or represent a
significant and distinguishable entity whose components may lack individual
distinction; (4) have yielded, or may be likely to yield, information important
in prehistory or history. In addition, the structure or building must possess
integrity of location, design, setting, materials, workmanship, feeling, and
association (National Register Bulletin, How to Apply the National Register
Criteria for Evaluation). For purposes of analyzing potential impacts to
historic structures/buildings, the thresholds of change for the intensity of an
impact are defined as follows:
-
Negligible – impact(s) is at the lowest levels of detection—barely
perceptible and not measurable. For purposes of section 106, the determination
of effect would be no adverse effect.
-
Minor (adverse impact) – impact would not affect the character defining
features of a NRHP eligible or listed structure or building. For purposes of
section 106, the determination of effect would be no adverse effect.
-
Minor (beneficial impact) – stabilization/preservation of character defining
features in accordance with the Secretary of the Interior’s Standards for the
Treatment of Historic Properties. For purposes of section 106, the determination
of effect would be no adverse effect.
-
Moderate (adverse impact) – impact would alter a character defining feature (s)
of the structure or building, but would not diminish the integrity of the
resource to the extent that its NRHP eligibility is jeopardized. For purposes of
section 106, the determination of effect would be no adverse effect.
-
Moderate (beneficial impact) – rehabilitation of a structure or building in
accordance with the Secretary of the Interior’s Standards for the Treatment of
Historic Properties. For purposes of section 106, the determination of effect
would be no adverse effect.
-
Major (adverse impact) – impact would alter a character defining feature (s)
of the structure or building, diminishing the integrity of the resource to the
extent that it is no longer eligible to be listed in the NRHP. For purposes of
section 106, the determination of effect would be adverse effect.
-
Major (beneficial impact) – restoration of a structure or building in
accordance with the Secretary of the Interior’s Standards for the Treatment of
Historic Properties. For purposes of section 106, the determination of effect
would be no adverse effect.
