Update to the EBTJV assessment
The EBTJV assessment is provided as a screening tool. The assessment is most appropriate for broad scale applications, e.g. questions about landscape-level patterns of wild brook trout and salmonid occupancy. It is not intended to represent stream reach level occupancy. Fill out this form if you would like to access the data for download.
Questions regarding stream reach level data should be directed to the corresponding agency partner. To get further insight on specific project locations, you should contact your EBTJV representative (see list here) to ask if they would review your project idea, prior to you writing a full proposal.
The EBTJV Eastern Salmonid Assessment in its most recent form is timestamped November 2024 using data through 2023. The EBTJV considers the assessment to be the best compilation of what is understood about wild brook, brown, and rainbow trout presence or absence across the EBTJV footprint using a single method across the 17 EBTJV states. The EBTJV relies on data provided by its agency partners according to an agreed upon procedure, and does not perform a validation of catchment classification at any scale. Data on location of state or other stocking efforts are not handled by the EBTJV.
The EBTJV assessment is conducted at the catchment scale. Catchments are small watersheds of stream reaches ~2-5 km long (however, there are some very small catchments in some areas). These catchments can be combined into patches, or groups of contiguous catchments occupied by trout. Patches are not physically connected to each other and are assumed to be genetically isolated populations. Data at each of these scales is supported by an occupancy model that predicts presence or absence by species based on occupancy downstream and stream connectivity based on the presence of major dams and waterfalls. The occupancy model does not incorporate culverts, however users may visualize culverts assessed to be moderate or severe barriers by turning on a layer provided by aquaticbarriers.org.
The EBTJV data include historic data for catchments that do not have more recent data available. As such, where only historic data is available (e.g., pre 2013), additional validation with the agency partner is recommended. The assessment is provided as a screening tool. The EBTJV assessment is most appropriate for broad scale applications, e.g. questions about landscape-level patterns of wild brook trout and salmonid occupancy. It is not intended to represent stream reach level occupancy. Questions regarding stream reach level data should be directed to the corresponding agency partner. A list of agency partner contacts is available here.
Users may request to download the geodatabase. The data may not be publicly reposted without permission from the EBTJV. It is, however, understood that organizations and entities may use the EBTJV data in analyses. If used as a data source for other tools, please attribute it to the EBTJV in metadata or other location. All users of these data agree to avoid their misuse. Use of the EBTJV assessment data does not imply endorsement by the EBJTV or its partners.
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