The Watershed Boundary Dataset is the highest resolution (HUC 12) standardized watershed delineation that is being developed on a nationwide scale. The USDA NRCS is responsible for developing the WBD in collaboration with other federal agencies and appropriate state water resource agencies. Watershed delineations for the New England area have been completed and watersheds that are totally or partially within Connecticut were downloaded and assembled into a project database. The map below depicts the 240 watersheds that cover Connecticut or contain streams that flow directly into Connecticut basins. These watersheds will serve as the aggregation areas for which watershed metrics will be developed.

Number of HUC12 watersheds - 240
Average size in square miles - 33.3
Minimum size in square miles - 0.73
Maximum size in square miles - 247.3

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