LTEMP Metrics

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Resource Goals and Metrics Cultural and Archaeological Resources Resource Goal Maintain the integrity of potentially affected NRHP-eligible or listed historic properties in place, where possible, with preservation methods employed on a site-specific basis. Metrics Integrity Topographic Change at a Sample of Sites Change in Vulnerability to Loss of Integrity Natural Processes Resource Goal Restore, to the extent practicable, ecological patterns and processes within their range of natural variability, including the natural abundance, diversity, and genetic and ecological integrity of the plant and animal species native to those ecosystems. Metrics Deviation from Natural Flow Metric ( with “sub-metrics”: spring-early summer, late summer-fall, and winter deviation from natural flows) Sub-daily Flow Fluctuation Metric Springtime Gross Primary Productivity Percent EPT Metric Humpback Chub Resource Goal Meet humpback chub recovery goals, including maintaining a self-sustaining population, spawning habitat, and aggregations in the Colorado River and its tributaries below the Glen Canyon Dam. Metrics Current Biological Opinion tier of humpback chub in the Little Colorado River (LCR) Aggregation Grand Canyon-wide abundance of adult humpback chub Proportion of Grand Canyon Ecosystem with evidence of all three life stages of humpback chub

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