Hwy 62 – 62 METHODS FOR ASSESSING IMPACTS – Historic Structures / Buildings

Rehabilitation of Highway 62 West, Crater Lake National Park, Klamath County, Oregon

 ENVIRONMENTAL CONSEQUENCES

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.

 

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