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Final Streamflow Classifications

Published by Department of Energy & Environmental Protection | State of Connecticut | Catalog Last Checked: May 26, 2026 at 05:15 PM | Dataset Last Updated: May 18, 2026
The following stream flow classifications on the map are final and include input provided during the public comment period.The State of Connecticut Stream Flow Standards and Regulations (Section 26-141b-1 to 26-141b-8 of the Regulations of Connecticut State Agencies) define four stream flow class standards: Class 1 is described as a free flowing stream Class 2 is described as minimally altered stream flow Class 3 is described as moderately altered stream flow Class 4 is described as substantially altered stream flow The regulations include consideration of 18 factors related to the degree of alteration in stream flow when adopting river or stream system classifications. Spatial data for each of the factors was gathered from a variety of best available sources. These sources were available at varying scales. A methodology was developed to consider all 18 factors and determine the class for a particular stream segment. In addition, public comment was solicited and considered to identify the final stream flow classification. For additional information on the classification process, see Section 26-141b-5 RCSA Adoption of river or stream system classifications, Fact Sheet for Stream Flow Classification Process under Section 26-141b-1 to 26-141b-8 of the Regulations of Connecticut State Agencies, Technical Support Document Methodology for Defining Preliminary Stream Flow Classification, and Final Stream Flow Classifications and Statement of Reasons Document. These documents can be found on the CT DEEP website at www.ct.gov/deep/streamflow.Description of fields and aliases: Field NameAliasFIDFIDShapeShapeHydroIDHydroIDICMetricImpervious Cover MetricDIVMetricDiversion MetricDAMMetricDam MetricSTPMetricReturn Flow MetricHSIHydrologic Stressor IndexResDownstream ReservoirLvlAAqfLevel A Aquifer AreaGrowthAreaGrowth AreaWBKWild Brook Trout PresentTMATrout Management AreaIndxGageIndex GagePOSMProtected Open SpaceFPWSFuture Public Water Supply

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accessLevel public
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description <p>The following stream flow classifications on the map are final and include input provided during the public comment period.</p><p>The State of Connecticut Stream Flow Standards and Regulations (Section 26-141b-1 to 26-141b-8 of the Regulations of Connecticut State Agencies) define four stream flow class standards:</p><p>&nbsp;</p><p>Class 1 is described as a free flowing stream</p><p>&nbsp;</p><p>Class 2 is described as minimally altered stream flow</p><p>&nbsp;</p><p>Class 3 is described as moderately altered stream flow</p><p>&nbsp;</p><p>Class 4 is described as substantially altered stream flow</p><p>&nbsp;</p><p>The regulations include consideration of 18 factors related to the degree of alteration in stream flow when adopting river or stream system classifications. Spatial data for each of the factors was gathered from a variety of best available sources. These sources were available at varying scales. A methodology was developed to consider all 18 factors and determine the class for a particular stream segment. In addition, public comment was solicited and considered to identify the final stream flow classification.</p><p>&nbsp;</p><p>For additional information on the classification process, see Section 26-141b-5 RCSA Adoption of river or stream system classifications, Fact Sheet for Stream Flow Classification Process under Section 26-141b-1 to 26-141b-8 of the Regulations of Connecticut State Agencies, Technical Support Document Methodology for Defining Preliminary Stream Flow Classification, and Final Stream Flow Classifications and Statement of Reasons Document. These documents can be found on the CT DEEP website at www.ct.gov/deep/streamflow.</p><p>Description of fields and aliases:<br />&nbsp;</p><figure><table style='border-collapse:collapse;' width='462' cellpadding='0' cellspacing='0' border='0'><tbody><tr style='height:15.0pt;' height='20'><td style='height:15.0pt; width:108pt;' height='20' width='144'>Field Name</td><td style='width:239pt;' width='318'>Alias</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>FID</td><td>FID</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>Shape</td><td>Shape</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>HydroID</td><td>HydroID</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>ICMetric</td><td>Impervious Cover Metric</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>DIVMetric</td><td>Diversion Metric</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>DAMMetric</td><td>Dam Metric</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>STPMetric</td><td>Return Flow Metric</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>HSI</td><td>Hydrologic Stressor Index</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>Res</td><td>Downstream Reservoir</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>LvlAAqf</td><td>Level A Aquifer Area</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>GrowthArea</td><td>Growth Area</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>WBK</td><td>Wild Brook Trout Present</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>TMA</td><td>Trout Management Area</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>IndxGage</td><td>Index Gage</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>POSM</td><td>Protected Open Space</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height='20'>FPWS</td><td>Future Public Water Supply</td></tr><tr style='height:15.0pt;' height='20'><td style='height:15.0pt;' height=
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issued 2024-01-29
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landingPage https://geodata.ct.gov/datasets/CTDEEP::final-streamflow-classifications
license https://creativecommons.org/publicdomain/zero/1.0
modified 2026-05-18
publisher 
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spatial -73.7114,41.0061,-71.7814,42.0518
theme 
                                            [
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]
title Final Streamflow Classifications

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