20200318 12542700 1.0 FGDC CSDGM Metadata FALSE LakesPonds 002 746625.256770 1238840.527587 66919.912990 1020759.884244 1 Projected GCS_North_American_1983 Linear Unit: Foot_US (0.304801) NAD_1983_StatePlane_New_Hampshire_FIPS_2800_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS[&quot;NAD_1983_StatePlane_New_Hampshire_FIPS_2800_Feet&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,984250.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-71.66666666666667],PARAMETER[&quot;Scale_Factor&quot;,0.9999666666666667],PARAMETER[&quot;Latitude_Of_Origin&quot;,42.5],UNIT[&quot;Foot_US&quot;,0.3048006096012192],AUTHORITY[&quot;EPSG&quot;,3437]]</WKT><XOrigin>-17463700</XOrigin><YOrigin>-48257000</YOrigin><XYScale>3048.0060960121928</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102710</WKID><LatestWKID>3437</LatestWKID></ProjectedCoordinateSystem> 20200428 14425500 20250730 14450600 5000000 5000 ISO19115_3 Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790 LakesPonds Waterbodies (as polygons) with Northeast Lake and Pond Class (Dec. 2015) Northeast Aquatic Habitat Classification 2015-12-21T00:00:00 2015-12-21T00:00:00 2016-03-17T00:00:00 TNC attributes transferred from original 1:100,000-scale source to 1:24,000-scale NHD features by NH Fish and Game Department, 17 March 2016. Eastern Division Conservation of The Nature Conservancy The Nature Conservancy 1 -72.65 -70.5 45.35 42.65 The objective of this project was to develop a mapped ecological classification of lakes and ponds. This classification was envisioned to represent the lakes and ponds using key variables that structure lacustrine natural communities that could be mapped consistently across all lakes and ponds in the region. These variables would be vetted and developed based on recommendations from a lake classification steering committee of experts from the northeast. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>TNC developed a mapped classification of lakes and ponds based on variables that structure lacustrine natural communities and that could be mapped consistently across Northeastern US. The classification was built upon four key attributes: water temperature, trophic state, alkalinity, and depth. Water temperature was mapped into three classes (very cold, cold, and warm-cool) to reflect the requirements and limits of aquatic organisms. Trophic states, representing the productivity of a lake, were mapped into two classes (oligomesotrophic -mesotrophic and eutrophic- hypereutrophic). Alkalinity was grouped into three classes (high, medium, low) to reflect how well the lake system was buffered from acidification. Depth was divided into two classes (lake, pond) based on a light penetration zone, using maximum depth and trophic state as a proxy for this zone. A steering committee of state and regional experts contributed sampled data with measured values of these and other variables for waterbodies in their states. To create the mapped classification, we compiled the location of every waterbody in the region (n = 36, 675) , and for each waterbody we generated over 300 descriptive attributes including: morphology, dams, climate, soils, geology, conservation lands, landforms, and land cover in the buffer zone or watershed. We used Random Forest software to develop a predictive model for each classification variable class based on the sampled data points and the descriptive attribute variables, and we then extrapolated the model to the unsampled waterbodies to estimate their class. After estimating each variable class, all waterbodies were assigned to one of 18 classification types based on the combination of 3 variables, temperature + trophic + alkalinity class. These types can be further subdivided into lake or pond categories to yield mapped occurrences, for example: cold, oligo-mesotrophic, low alkalinity, lake. The 18 primary lake and pond types are described in the addition to the “Northeast Terrestrial and Aquatic Habitat Guide”, December 2015. </SPAN></P><P><SPAN>NH Fish and Game Department (NHFG) transferred attributes to the 1:24,000-scale NH Hydrography Dataset, current source link: https://www.nhgeodata.unh.edu/datasets/NHGRANIT::new-hampshire-hydrography-dataset-waterbody/about </SPAN></P><P><SPAN>Aquatic habitat condition assessment and Important Fish Habitat attributes updated by NHFG April 2025.</SPAN></P></DIV></DIV></DIV> The Nature Conservancy reserves all rights in data provided. All data are provided as is. This is not a survey quality dataset. The Nature Conservancy makes no warranty as to the currency, completeness, accuracy or utility of any specific data. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. NH Fish and Game Department (NHFG) transferred attributes to the 1:24,000-scale NH Hydrography Dataset, current source link: https://www.nhgeodata.unh.edu/datasets/NHGRANIT::new-hampshire-hydrography-dataset-waterbody/about Aquatic habitat condition assessment and Important Fish Habitat attributes updated by NHFG April 2025. Lakes; lacustrine; habitat classification; lake classification Northeast New England New Hampshire NH NHFG NH Fish and Game biota environment habitat wildlife SWAP Wildlife Action Plan <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Nature Conservancy compiled this data set from publicly available data sources and this data is freely distributable without permission from Eastern Division Conservation Science. This data set must be cited on all electronic and hard copy products using the language of the Data Set Credit. The Nature Conservancy shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any sale, distribution, loan, or offering for use of these digital data, in whole or in part, is prohibited without the approval of The Nature Conservancy. The use of these data to produce other GIS products and services with the intent to sell for a profit is prohibited without the written consent of The Nature Conservancy. All parties receiving these data must be informed of these restrictions. The Nature Conservancy shall be acknowledged as data contributors to any reports or other products derived from these data.</SPAN></P></DIV></DIV></DIV> File Geodatabase Feature Class dataset EPSG 6.12(9.3.0.0) 15650 Simple FALSE 15650 TRUE FALSE LakesPonds Feature Class 15650 OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. Permanent_ Permanent_ String 40 0 0 NHD High Resolution Permanent ID NHD FDate FDate Date 8 0 0 Feature date NHD Resolution Resolution Integer 4 0 0 Feature resolution NHD GNIS_ID GNIS_ID String 10 0 0 GNIS identifier GNIS GNIS_Name GNIS_Name String 65 0 0 Name of the water body GNIS Elevation Elevation Double 8 0 0 Elevation DEM ReachCode ReachCode String 14 0 0 Reach code NHD NHFGID NHFGID Integer 4 0 0 Temporary unique numeric ID for each water body NH Fish and Game Department Acres Acres Double 8 0 0 surface area in acres calculated Hectares Hectares Double 8 0 0 surface area in hectares calculated MAXDEPTH_M MAXDEPTH_M Double 8 0 0 maximum depth in meters NH Dept. of Environmental Services NHFISHERY NHFISHERY String 20 0 0 Temperature class of fishery NH Fish and Game Department NHFISHNOTE NHFISHNOTE String 50 0 0 Supplemental info of fishery NH Fish and Game Department TOP25 TOP25 SmallInteger 2 0 0 Top-Ranked Lake or Pond if value is greater than zero NH Fish and Game Department MAXFT MAXFT Double 8 0 0 Maximum depth in feet TNC DEPTHSRC DEPTHSRC String 61 0 0 Source for depth value TNC TYPENUM TYPENUM Double 8 0 0 TNC TYPE TYPE String 100 0 0 Descriptive name for the 18 types, based on unique combinations of 3 temperature classes + 2 trophic classes + 3 alkalnity classes; same as abbreviation codes in field T3_TR2_A3 TNC T3_TR2_A3 T3_TR2_A3 String 8 0 0 Abbreviation for the 18 types based on unique combinations of 3 temperature classes + 2 trophic classes + 3 alkalnity classes: 1st value is temperature class (VC = Very Cold, C = Cold, CCW = Cool-Warm), 2nd value is trophic class (OM = oligotrophic to mesotrophic, EH = eutrophic to hypereutrophic), 3rd value is alkalinity class (H= high, M = medium, L = low) TNC T3TR2A3D2 T3TR2A3D2 String 13 0 0 Abbreviation for unique combinations of 3 temperature classes + 2 trophic classes + 3 alkalnity classes + 2 depth classes: 1st value is temperature class (VC = Very Cold, C = Cold, CCW = Cool-Warm), 2nd value is trophic class (OM = oligotrophic to mesotrophic, EH = eutrophic to hypereutrophic), 3rd value is alkalinity class (H= high, M = medium, L = low), the 4th value is depth class (pond, lake) TNC T4_TR2_A3 T4_TR2_A3 String 7 0 0 Abbreviation for unique combinations based on 4 temperature classes + 2 trophic classes + 3 alkalnity classes: 1st value is temperature class (VC = Very Cold, C = Cold, CC = Cold-Cool, W =Warm), 2nd value is trophic class (OM = oligotrophic to mesotrophic, EH = eutrophic to hypereutrophic), 3rd value is alkalinity class (H= high, M = medium, L = low) TNC T4TR2A3D2 T4TR2A3D2 String 12 0 0 Abbreviation for unique combinations based on 4 temperature classes + 2 trophic classes + 3 alkalnity classes + 2 depth classes: 1st value is temperature class (VC = Very Cold, C = Cold, CC = Cold-Cool, W =Warm), 2nd value is trophic class (OM = oligotrophic to mesotrophic, EH = eutrophic to hypereutrophic), 3rd value is alkalinity class (H= high, M = medium, L = low), 4th value is depth class (pond, lake) TNC OUT_TEMP3 OUT_TEMP3 String 3 0 0 output 3 temperature class code: VC = Very Cold, C = Cold, CCW =Cool to Warm TNC OUT_TEMP4 OUT_TEMP4 String 2 0 0 output 4 temperature class code: VC = Very Cold, C = Cold, CC = Cool, W =Warm TNC CONF_TEMP3 CONF_TEMP3 String 11 0 0 Confidence in the output temperature 3 class code: Known: Variable class based on sample data; others based on difference in maximum probability and second highest probability of class membership output from the model as 1. High Confidence: Difference in greater than >= 25%, 2. Medium Confidence: Difference >= 10 and <25%, 3. Low Confidence: Difference between >=5 and < 10%, 4. Very Low Confidence: Difference less than 5% TNC CONF_CC_W CONF_CC_W String 11 0 0 Confidence in the output temperature Cool (CC) vs. Warm (W) class code: Known: Variable class based on sample data, then based on difference in maximum probability and second highest probability of class membership output from the model as 1. High Confidence: Difference in greater than >= 25%, 2. Medium Confidence: Difference >= 10 and <25%, 3. Low Confidence: Difference between >=5 and < 10%, 4. Very Low Confidence: Difference less than 5% TNC OUT_TROPCL OUT_TROPCL String 2 0 0 Output trophic class, OM = oligotrophic to mesotrophic, EH = eutrophic to hypereutrophic TNC CONF_TROP CONF_TROP String 11 0 0 Confidence in the output trophic class code: Known: Variable class based on sample data; others based on difference in maximum probability and second highest probability of class membership output from the model as 1. High Confidence: Difference in greater than >= 25%, 2. Medium Confidence: Difference >= 10 and <25%, 3. Low Confidence: Difference between >=5 and < 10%, 4. Very Low Confidence: Difference less than 5% TNC OUT_ALKCL OUT_ALKCL String 1 0 0 output alkalinity class H= high, M = medium, L = low TNC CONF_ALKCL CONF_ALKCL String 11 0 0 Confidence in the output trophic class code: Known: Variable class based on sample data; others based on difference in maximum probability and second highest probability of class membership output from the model as 1. High Confidence: Difference in greater than >= 25%, 2. Medium Confidence: Difference >= 10 and <25%, 3. Low Confidence: Difference between >=5 and < 10%, 4. Very Low Confidence: Difference less than 5% TNC DEPTH_CL DEPTH_CL String 4 0 0 output depth class, pond or lake; based on rules regarding depth of light penetration for waterbodies of a given trophic class: Oligo-Mesotrophic ponds = 0-20ft, lakes >20ft; Eutrophic-hypereutrophic ponds 0-10ft, lakes >10ft. TNC OVERRIDE OVERRIDE String 150 0 0 Text describing why this waterbody was changed from its modeled class into another class. Ususally reasons were due to state expert comments received during the review period Oct-Nov 2015 TNC Hab_guide Hab_guide String 150 0 0 hyperlink to habitat guide TNC Shape_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. NHLAKECLASS NHLAKECLASS String 25 0 0 SPPCONCERN SPPCONCERN String 1 0 0 species of conservation concern present during surveys through 2024 NH Fish and Game Department 2024 HerringStock HerringStock String 1 0 0 Y River herring stock location, M migratory path downstream to Merrimack River NH Fish and Game Department 2024 WAPSPECIES WAPSPECIES String 40 0 0 List of species of conservation concern present during surveys through 2024 NH Fish and Game Department, 2024 BridleShiner BridleShiner String 1 0 0 bridle shiner Present in water body during surveys through 2024 NH Fish and Game Department, 2024 EBT EBT String 1 0 0 wild brook trout Present in water body during surveys through 2024 NH Fish and Game Department, 2024 20250730 GIS Coordinator NH Fish and Game Department 11 Hazen Dr Concord NH 03301 catherine.callahan@nh.gov 603-271-3014 We compiled 36,675 lake and pond waterbody polygons as our base dataset. This included all 1:100,000 lakes and ponds from the Northeast from the National Hydrography Dataset V2 (USEPA 2013) (n = 32, 652). To address problems noted by the team in terms of some additional large waterbodies being missing from our database, for this 2015 revisions we also added all lakes and ponds >= 10 acres from the NHD High Resolution + NWI dataset compiled by J. Grand at University of Massachusetts that were not already in the existing database. This resulted in an additional 4, 023 polygons being added in 2015, for a final total of 36, 675 waterbodies. NH Fish and Game Department transferred TNC attributes to the 1:24,000-scale NHD for water bodies within the state of New Hampshire.