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Layer: Water Body AUs - Rivers (arcs) (ID: 680)

Parent Layer: 2018 Integrated List Data - 305(b)/314/303(d)

Name: Water Body AUs - Rivers (arcs)

Display Field: CYCLE

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: Water Body AUs - Rivers (arcs) ----- River AUs: : Individual river AUs are represented as one or more lines in the arc feature class. Linework was derived from the MassGIS 1:25,000 hydrographybased on USGS topographic maps. Additional on-screen editing was performed as needed using USGS topographic quadranglesand/or MassGIS Aerial Imagesas a base map for all river AUs. Lake AUs:Lake AUs are represented as one or more polygons in the polygon feature class. Lake AU polygons were selected from the MassGIS 1:25,000 hydrographylayer, where available, and placed in a separate file where additional editing (typically closure lines) may have been performed. In some cases AUs were drawn and/or edited to reflect current conditions using USGS topographic quadrangles, and/or MassGIS Aerial Imagesas the base map. Estuary AUs:Estuary AUs are represented as polygons. Where available, polygons are derived from the MassGIS 1:25,000 hydrographybased on the name and description of each estuarine AU. Additional on-screen digitizing to close polygons to reflect waters actually assessed, but that may not have been represented in the hydrography layer, was completed using the USGS topographic quadranglesas the base map. All AUs (Rivers, Lakes, Estuaries): River, lake, and estuary features, regardless of their derivation, were combined into two single statewide feature classes, one for lines (IL_2018_ARC alias: Waterbody AUs - Rivers (arcs)) and one for polygons (IL_2018_POLY alias: Waterbody AUs - Lakes, Estuaries (polygons)). There is no AU overlap in any two adjacent river, lake, or estuary features. Attributes: Except for standard GIS items (e.g., Shape_Length (meters), Shape_Area (square meters), Shape, OBJECTID, FID), all attributes were obtained from the DWM/WPP and are presented in the table IL_ATTAINS_2018. This table has a many-to-one relationship with individual features in the IL_2018_ARC and IL_2018_POLY features classes. Only attributes that are the same for every record concerning a feature were added to the attribute table of the feature set. A waterbody AU has only one unique identifier (AU_ID) and description, however, in the ATTAINS table the individual AU information repeats as necessary to accommodate the number of uses assessed, each cause of impairment, and each source for the cause of impairment. The IL_ATTAINS_2018 table can be related to geographic features using the AU_ID. The additional table (IL_SEGDEF_2018) can be used for summarizing data and can be related to geographic features using the AU_ID. Fields in the IL_2018_POLY and IL_2018_ARC attribute tables are as follows:Cycle: Reporting cycle year. Note: although this field shows 2018, the reporting cycle was combined for 2018 and 2020.WBID_2018: Assessment Unit ID (AU_ID) with the reporting cycle year. For simplification, only the first year of the combined 2018/2020 reporting cycle was used.Watershed: The MassDEP DWM/WPP watershed delineations are based on the MassGIS Major Basins layer; modified to reflect surface drainage areas for use with the MassDEP Integrated List of Waters report by the WPP. For example, a portion of the Cape Cod Watershed Area was changed to reflect its drainage into Buzzards Bay, resulting in shape changes for both the Cape Cod and Buzzards Bay watershed delineations. In general, the watershed name is based on the Massachusetts Stream and River Inventory System (SARIS) that includes all Massachusetts river basins and coastal drainage areas (Halliwell et al., 1982). The WPP watershed name Boston Harbor (Proper) does not appear in the MassGIS Major Basins layer or the SARIS list of watersheds; it refers to the harbor itself. Three drainage area types are further described in SARIS as follows: River Basin: Major inland river basin. River Basin and Coastal Drainage Area: Major inland river basin coupled with smaller areas draining directly to coastal waters within the general geographic area of the associated river basin. Coastal Drainage Area: Subdivisions of the coastal drainage system that have been partitioned into specific geographic areas. These areas all drain to coastal waters but may have multiple small-scale drainages.Waterbody: Waterbody names are based on three inventory systems: Stream and River Inventory System (SARIS), Pond and Lake Inventory System (PALIS), or Coastal and Marine Inventory System (CAMIS).AU_ID: Water body Assessment Unit identification code (AU_ID) for the 2018/2020 cycle of the Massachusetts Integrated List of Waters report.Location1: Description of the waterbody AU.Location2: Continuation of the location description if LOCATION1 exceeds 255 characters.WaterCode: Unique waterbody code based on SARIS, PALIS, or CAMIS inventory coding systems.WaterType: Waterbody AU type: River (freshwaters, including streams, brooks, etc.), Lake (freshwaters, including ponds, reservoirs, etc.), or Estuary (coastal waters, including bays, estuaries, salt ponds, etc.).AU_Size: Size of the waterbody AU. (Some historic values in this field may have been based on measurements made with map wheels and other techniques including, but not limited to, planimetry using USGS Quad sheets at a scale of 1:25,000. New values are generated using GIS.) AU_Size is the size reported to the EPA for the AU (portion within the state only, not necessarily the entire waterbody).Size_Unit: Waterbody size units: Miles (Rivers), Acres (Lakes), Square Miles (Estuaries)Class: Class assigned to the water body as defined in the Massachusetts Surface Water Quality Standards (314 CMR 4.00) that can be found at Massachusetts Surface Water Quality Standards (314 CMR 4.00).(Clarification Note: Classification is reflective of Standards version available at the time when assessment decisions were made.)Qualifier: Class qualifiers (e.g., WWF [warm water fishery], CWF [cold water fishery], etc.) assigned to waterbody as defined in the Massachusetts Surface Water Quality Standards (314 CMR 4.00). (Clarification Note: Classification is reflective of Standards version available at the time when assessment decisions were made.)Category: The category of the water body AU in the Massachusetts Year 2018/2020 Integrated List of Waters report; category descriptions are as follows:Category 1) Unimpaired and not threatened for all designated uses; Category 2)Unimpaired for some uses and not assessed for others; Category 3) Insufficient information to make assessments for any uses; Category 4)Impaired for one or more uses, but not requiring the calculation of a Total Maximum Daily Load (TMDL) Category 4A) Impaired for one or more designated uses but does not require the development of a TMDL: TMDL has been completed. Category 4B) Impaired for one or more designated uses but does not require the development of a TMDL: Other pollution control requirements are reasonably expected to result in the attainment of designated uses. Category 4C) Impaired for one or more designated uses but does not require the development of a TMDL: Impairment is not caused by a pollutant. Category 5) Impaired for one or more uses and requiring a restorative "action" plan, such as a TMDL or Alternative Restoration Plan (impairment due to pollutant(s) such as nutrients, metals, pesticides, solids, and pathogens).REP_count: The number of unique action plans (TMDL reports or Alternative Restoration Plans) associated with the AU for the 2018/2020 reporting cycle.

Copyright Text: The MassDEP Division of Watershed Management (DWM), Watershed Planning Program (WPP). For questions regarding the programmatic content of these data contact Arthur Johnson (508-767-2873) or Richard Chase (508-767-2859) in the MassDEP, Watershed Planning Program. For questions relating to GIS and these data, contact Kashif Rashid (617-292-5851) in the MassDEP, GIS Program.

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