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These report cards are based on information from the 2015 Watershed Health Index. 2015 is the first year reporting this data, so each report card represents a snapshot of current watershed conditions. Trend information will be available in the future.
Each Portland watershed has unique history, geography, natural resources and land uses. For that reason, scores from one watershed shouldn't be compared against another watershed’s scores.
The report cards apply to only the portion of the watershed within the Portland city limits. Portland shares its watersheds with other jurisdictions upstream and downstream. Johnson Creek, for example, flows through two counties and several cities. Some of the report card scores pertain to things we can improve in Portland. Improvements in other scores will require continued cooperation with neighboring communities and regional efforts.