Technical Report


San Juan Island National Historical Park Natural Resource Condition Assessment Public Deposited

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  • We compiled existing data and information to characterize the condition and trends in high priority natural resources in San Juan Island National Historical Park. We identified 37 indicators to evaluate the condition and trend of these resources. For each indicator we attempted to define reference conditions to which we could compare present conditions. When those could be identified and a comparison made, we described the condition of each indicator as “Good,” “Somewhat Concerning,” “Significant Concern,” or “Unknown.” We described each indicator’s trend as “Improving,” “Stable,” “Declining,” or “Unknown.” In each instance where we applied these terms, we also described the certainty associated with our estimate as "High," "Medium," "Low," or as "Not Applicable" (N/A) where condition or trend are Unknown. Where reference conditions that were the basis for our comparisons lacked quantitative standards, we based the assessment on qualitative descriptions of least-alteredxi resource conditions derived from historical accounts, scientific literature, and professional opinion. Applying the 37 indicators, we determined that the condition of the following indicators is presently of “Significant Concern” in this park: · Prairies · Rare Plant Taxa (Castilleja levisecta, Ranunculus californicus var. californicus, Symphyotrichum hallii) · Composition, Age, and Structure of Forests · Wildlife Associated with Prairie & Oak Woodlands · Invasive or Harmful Wildlife We assigned a rating of “Somewhat Concerning” to 16 indicators: · Eelgrass · Forage Fish · Invasive Nearshore Species · Groundwater Levels and Quality · Wetland Biological Condition · Oak Woodlands · Coastal Strand, Spit, and Dune Communities · Native Plant Richness and Invasive Plants · Crassula connata (a rare plant) · Forest Age and Composition · Sensitive Birds · Sensitive Mammals · Habitat Connectivity and Structure · Nitrogen & Sulfur Deposition · Visibility & Viewsheds Information was insufficient to rate the present condition of 16 indicators. With regard to trends, we found information was sufficient to rate the recent trends of only 3 of the 37 indicators. Those were Temperature Trends, Precipitation Trends, and Eelgrass.
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  • Adamus, P. R., P. Dunwiddie, and A. Pakenham. 2015. San Juan Island National Historical Park Natural Resource Condition Assessment. Natural Resource Report, Draft. National Park Service, Fort Collins, Colorado.
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  • 171100030500
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  • This report was prepared under Task Agreement P12AC15016 (Cooperative Agreement H8W07110001) between the National Park Service and Oregon State University



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