Indicator: Stream Habitat Occupied by Brook Trout (2016-2024)

<p><i><strong>This data resource is a layer in a map service. To download it, please go to the "Layers" section of this page and click the name of the dataset. This will open a new page that features a download button.</strong></i></p><p><strong>Access the Indicator Materials:</strong><br>- <a target="_blank" rel="noopener noreferrer" href="https://d18lev1ok5leia.cloudfront.net/chesapeakeprogress/chart-assets/net-change-in-habitat-area-occupied-by-brook-trout-2016-2024/Analysis-and-Methods-2024-Brook-Trout-Habitat-Occupancy-2025-08-01.pdf">Analysis &amp; Methods</a><br>- <a target="_blank" rel="noopener noreferrer" href="https://d18lev1ok5leia.cloudfront.net/chesapeakeprogress/chart-assets/net-change-in-habitat-area-occupied-by-brook-trout-2016-2024/Data-2024-Brook-Trout-Occupancy.xlsx">Data File</a><br>- <a target="_blank" rel="noopener noreferrer" href="https://gis.chesapeakebay.net/ags/rest/services/ChesapeakeProgress/cpBrookTrout/MapServer">Map Service</a></p><p>This dataset describes gains and losses in brook trout habitat between 2016 and 2024, based on Eastern Brook Trout Joint Venture (EBTJV) salmonid assessments conducted in those years. Changes are measured in square kilometers and mapped at the catchment scale, which includes small watersheds with 2–5 km stream reaches. EBTJV assessments produce a habitat occupancy dataset that describes the distribution of brook trout across the eastern United States. Occupancy is determined either through direct sampling, based on fish survey data, or through a spatial model that infers occurrences upstream from sampled locations. Data are reported at the catchment scale and aggregated into “patches.”</p><p><strong>Note: This Indicator supported progress tracking toward the Brook Trout Outcome in the original Chesapeake Bay Watershed Agreement, adopted in 2014. The Watershed Agreement and Brook Trout Outcome were revised in 2025.</strong></p>