Name: Lakes and Reservoirs

Display Field: GNIS_Name

Type: Feature Layer

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Description: Note: This single feature class is one of a set of feature classes (3) that geospatially depict Maryland's surface waters (streams/rivers, tidal water bodies, and impoundments). The Impoundment feature class is the official geospatial representation of the major impoundments managed within Maryland. Other impoundments do exist, however, they may have limited access (privately owned) or they may be small (<5 acres) in size and therefore are not part of the state's regulatory water quality monitoring.To create this file, MDE started with the NHD water body feature class. In cases where the NHD water body feature class did not accurately represent the extent of an impoundment, the impoundment was hand-traced using high resolution aerial photography, and MDE assigned a new ComID. Not all impoundments in Maryland were included in this shapefile. This was purposefully done as thousands of impoundments exist and many of these are not regularly assessed by the state. However, impoundments may be added to this shapefile in the future should new ones be created or should the state find the need to identify their use class. The 2019 update included thirteen impoundments which were not included in the 2014 update. The 2023 update reflects revisions to COMAR 26.08.02.08 completed through the 2019 Triennial Review of Maryland's Water Quality Standards.Note: COMAR regulation may be accessed via the following link: https://dsd.maryland.gov/regulations/Pages/26.08.02.08.aspx. Even though this data set is the best visual representation of the uses described in COMAR, when any discrepancies occur between this dataset and COMAR, always default to COMAR. Caution should be exercised when using this file to generate data regarding use extent (in impoundment acres or other geometric length) as the size in the attribute table reflects the area of impoundment calculated using the Maryland State Plane Meters (NAD 1983) projection. Also, designated uses herein only apply to waters within the State of Maryland, whose borders and NHD segmentation do not always match.By having Maryland’s water body use classifications linked to a common identifier (COMID) code, the information contained in the dataset can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS) to aid in regulatory decision making.

Definition Expression: N/A

Copyright Text: MDE’s Water and Science Administration would like to acknowledge the United States Geological Survey for their 1:24,000 scale National Hydrography Dataset upon which this file was based.

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