Rehabilitation of Highway 62 West, Crater Lake National Park, Klamath County, Oregon
ENVIRONMENTAL CONSEQUENCES
METHODS FOR ASSESSING IMPACTS
Archeological Resources
Definitions of Intensity Levels
In order for an archeological resource to be eligible for 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; and/or (4) have yielded, or may be likely to yield, information important in prehistory or history. In addition, the archeological resource must possess integrity of location, design, setting, materials, workmanship, feeling, and association (National Register Bulletin, Guidelines for Evaluating and Registering Archeological Properties). For purposes of analyzing impacts to archeological resources, either listed in or eligible to be listed in the NRHP, the thresholds of change for intensity of an impact are defined below:
- Negligible – impact is at the lowest levels of detection—barely measurable with no perceptible consequences, either adverse or beneficial, to archeological resources. For purposes of section 106, the determination of effect would be no adverse effect.
- Minor (adverse impact) – disturbance of a site (s) results in little, if any, loss of significance or integrity and the NRHP eligibility of the site (s) is unaffected. For purposes of section 106, the determination of effect would be no adverse effect.
- Minor (beneficial impact) – maintenance and preservation of a site (s). For purposes of section 106, the determination of effect would be no adverse effect.
- Moderate (adverse impact) – disturbance of a site (s) does not diminish the significance or integrity of the site (s) to the extent that its NRHP eligibility is jeopardized. For purposes of section 106, the determination of effect would be adverse effect.
- Moderate (beneficial impact) – stabilization of a site (s). For purposes of section 106, the determination of effect would be no adverse effect.
- Major (adverse impact) – disturbance of a site (s) diminishes the significance and integrity of the site (s) 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) – active intervention to preserve a site (s). For purposes of section 106, the determination of effect would be no adverse effect.
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