Connecticut 305b Assessed Lake 2018 is a 1:24,000-scale, polygon feature-based layer that includes lakes that have been assessed in compliance with Sections 305(b) and 303(d) of the federal Clean Water Act. Section 305(b) of the Clean Water Act requires each state to monitor, assess and report on the quality of its waters relative to attainment of designated uses established by the State's water quality standards. Section 303(d) requires each State to compile a subset of that list identifying only those waters not meeting water quality standards and assign a Total Maximum Daily Load (TMDL) priority ranking to each impaired waterbody. This layer is based on information collected and compiled prior to 2018. It represents conditions at a particular point in time and does not represent current conditions. This layer includes only assessed lakes. It can be used with the 2018 Connecticut 305b Assessed River layer and the Connecticut 305b Assessed Estuary layer to geographically display attainment and non-attainment for each designated use on assessed waters within Connecticut's boundaries. Features are polygon locations that represent the locations of assessed lakes. The sources for these features include the hydrography layer and the water quality classification layer. Attribute information is comprised of the Connecticut lake identification number, a unique identifier for each feature, the name of the waterbody, its location, the assessment cycle (year), the water type, the water quality class goal, the length of the feature in miles, the National Hydrography Dataset basin number, and the assessment for the following categories: aquatic life, recreation, fish consumption, and drinking water supply. Data is compiled at 1:24,000 scale. This dataset is not updated.
For additional information, refer to the Water Quality Standards for the State of Connecticut at http://www.ct.gov/dep/lib/dep/water/water_quality_standards/wqs.pdf.
ground condition
Connecticut 305b Assessed Lakes represented as polygon features. (Source: State of Connecticut, Department of Energy and Environmental Protection)
Internal feature number. (Source: ESRI)
Assigned unique identification. (Source: Connecticut Department of Energy and Environmental Protection)
Size in acres of feature. (Source: Connecticut Department of Energy and Environmental Protection)
A unique identification number for each lake in Connecticut. (Source: Connecticut Department of Energy and Environmental Protection)
Reporting year. (Source: Connecticut Department of Energy and Environmental Protection)
| Value | Definition |
|---|---|
| 2018 |
Reporting date. |
Detailed description of feature location. (Source: Connecticut Department of Energy and Environmental Protection)
Identification number of National Hydrography Dataset basin. (Source: Connecticut Department of Energy and Environmental Protection)
Water quality classication (Source: Connecticut Department of Energy and Environmental Protection)
Name (Source: Connecticut Department of Energy and Environmental Protection)
Assessment of feature in terms of the viability of aquatic life. (Source: Connecticut Department of Energy and Environmental Protection)
| Value | Definition |
|---|---|
| Fully Supporting |
Aquatic life is fully supported for this feature. |
| Not Assessed |
Aquatic life viability is not assessed for this feature. |
| Not Supporting |
Aquatic life viability is not supported for this feature. |
Assessment of feature in terms of recreation use. (Source: Connecticut Department of Energy and Environmental Protection)
| Value | Definition |
|---|---|
| Fully Supporting |
Recreation use is fully supported for this feature. |
| Not Assessed |
Recreation use is not assessed for this feature. |
| Not Supporting |
Recreation use is not supported for this feature. |
Assessment of feature in terms of fish consumption. (Source: Connecticut Department of Energy and Environmental Protection)
| Value | Definition |
|---|---|
| Fully Supporting |
Fish consumption use is fully supported for this feature. |
| Not Assessed |
Feature not assessed. |
| Not Supporting |
Fish consumption is not supported for this feature. |
Assessment of feature in terms of drinking water supply. (Source: Connecticut Department of Energy and Environmental Protection)
| Value | Definition |
|---|---|
| Fully Supporting |
Drinking water supply use is fully supported for this feature. |
| Not Assessed |
Drinking water supply use has not been assessed for this feature. |
| Water Not Classified For Drinking Supply |
Drinking Water Supply use is not classified for this feature. |
| Potential Supply, Not Assessed For Drinking Water |
Feature not assessed for drinking water. |
Feature geometry. (Source: ESRI)
Includes assessed river features to include the Connecticut lake identification number, area in acres, the reporting year (assessment year), unique 305b identification number, name and location of feature, water quality class goal, type of waterbody, NHD basin, and categories assessed: aquatic life viability, recreation, fish consumption, and drinking water supply. Use the ID305B field to uniquely identify features. The Name attribute decodes ID305B. Use either the Name attribute or the ID305B attribute to label features on a map. To define a layer that only includes a certain assessment of a feature type, query the features for a specific attribute (e.g. Recreation) equal to a specific value (e.g. Not Supporting). This will display only those features where the Recreation use is Not Supporting.
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Connecticut 305(b) Assessed Lake 2018 is 1:24,000-scale data. It depicts assessed lakes throughout the state. Use this layer to show the locations of lakes and their accompanying use assessment . This layer should be used with the other assessed waterbody layers: Assessed Estuary and Assessed River. To gain a historical perspective, use this layer with the other Assessed Waters layers. This layer should only be viewed with other 1:24,000-scale map data such as water quality classifications, roads, towns, topographic quadrangles, and digital orthophotos. Not intended for maps printed at map scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet.)
Some hydrographic features were copied from this dataset.
Some feature attribute information originated from the water quality classification feature class created by the Department of Environmental Protection.
Metadata imported.
Metadata imported.
Metadata imported.
None. No restrictions or legal prerequisites for using the data after access is granted. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set has been used by the State of Connecticut, Department of Energy and Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Energy and Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Energy and Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Energy and Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Lake Assessment - From the Connecticut 305b Assessed Lake 2018, layer, compiled and published by CT DEEP. Source map scale is 1:24,000. This data is accurate in the time period specified for data collection dates. Refer to the "State of Connecticut Integrated Water Quality Report" at http://www.ct.gov/dep/lib/dep/water/water_quality_management/305b/2016_iwqr_final.pdf for more information about collection dates.
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Although this data set has been used by the State of Connecticut, Department of Energy and Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Energy and Environmental Protection as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Energy and Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata.
| Data format: |
in format Shapefile, Feature Class (version ArcGIS)
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|---|---|
| Network links: | http://www.ct.gov/deep |
The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
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