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 Hydropower and Energy Resource Goal Maintain or increase Glen Canyon Dam electric energy generation, load following capability, and ramp rate capability, and minimize emissions and costs to the greatest extent practicable, consistent with improvement and long-term sustainability of downstream resources. Metrics Glen Canyon Dam Energy Production Economic Value of Glen Canyon Dam Energy Production Marketable Capacity of Glen Canyon Dam Energy Other Native Fish Species Resource Goal Maintain self-sustaining native fish species populations and their habitats in their natural ranges on the Colorado River and its tributaries. Metrics Proportion of Grand Canyon Ecosystem (GCE) with evidence of all 3 life stages of Bluehead Sucker (Catostomus discobolus), Flannelmouth Sucker (Catostomus latipinnis), Razorback Sucker (Xyrauchen texanus) Proportion of GCE with Speckled Dace (Rhinichthys osculus) (any life stage) Proportion of GCE with extirpated species (any life stage) Recreational Experience Resource Goal Maintain and improve the quality of recreational experiences for the users of the Colorado River Ecosystem. Recreation includes, but is not limited to, flatwater and whitewater boating, river corridor camping, and angling in Glen Canyon. Metrics Economic Value of Recreation Experience Sediment Resource Goal Increase and retain fine sediment volume, area, and distribution in the Glen, Marble, and Grand Canyon reaches above the elevation of the average base flow for ecological, cultural, and recreational purposes. Metrics Performance Metric: Sand Bar Volume (includes multiple “sub-metrics”, e.g., normalized sandbar volume by type, mean sand bar response to HFEs) Surveillance Metrics: Sand Supply By River Segment (Sand Mass Balance) Silt & Clay Retention by River Segment (Turbidity) Tribal Perspectives Resource Goal Maintain the diverse values and resources of traditionally associated Tribes along the Colorado River corridor through Glen, Marble, and Grand Canyons. Metrics Is the Colorado River ecosystem healthy? Please explain why or why not. How well is LTEMP doing at meeting its goals? Please explain the basis for your assessment. Overall, is the Grand Canyon doing better, worse, or about the same as last year? Please explain the basis for your assessment. Rainbow Trout Fishery Resource Goal Achieve a healthy high-quality recreational rainbow trout fishery in GCNRA and reduce or eliminate downstream trout migration consistent with NPS fish management and ESA compliance. Metrics Trout Angler Catch Rate Rainbow Trout (Oncorhynchus mykiss) Abundance Nonnative Invasive Species Resource Goal Minimize or reduce the presence and expansion of aquatic nonnative invasive species. Metrics Average number of “risky species” per Habitat Segment in Grand Canyon Ecosystem Average number of “risky species” with evidence of recent recruitment per Habitat Segment in Grand Canyon Ecosystem Riparian Vegetation Resource Goal Maintain native vegetation and wildlife habitat, in various stages of maturity, such that they are diverse, healthy, productive, self-sustaining, and ecologically appropriate. Metrics Total Plant Cover Native Plant Richness Native to Non-native Plant Species Cover Ratio

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