Inset of the Topography and Water Depth Map of the Conway Lake Area
AIS Patrol Maps:
The Conway Lake shoreline has been divided into 17 Zones for the purpose of assigning different parts of the lake to AIS Patrol members. Detailed satellite maps of each zone with a grid overlay are available below and can be printed for use on the lake or at home. The grids on the maps are intended to help identify those areas that are shallow enough to view plants and as an aid for you to record which areas have been checked, or to communicate the location of interesting or suspicious plants. The larger Index Map of the Lake shows the position of all 17 Zones around the lake. Click this link for the maps:
Lakes in New Hampshire and Maine with Aquatic Invasive Species:
Sign with map of NH and Maine lakes with invasive species - click here
The link below takes you to a map published by the NH DES of lakes with known infestations of aquatic plants and animals.
This next link will take you to an interactive map of NH lakes. If you zoom in on the map and click on a waterbody, a dialogue box will pop up and show lists of infestations and reports specific to that lake.
Interactive Map of Maine Lakes with Invasive Aquatic Plants
Topography and Water Depth Map of Conway Lake and Surrounding Area
This map shows land use, topography, streams, water sample locations and water depth in Conway Lake. The primary source for data on this map was the University of New Hampshire Granit GIS database (http://www.granit.unh.edu/). Streams were digitized from USGS topographic maps and updated based on high-resolution satellite and LIDAR images. Topographic contours were created in ArcMap from a Digital Elevation Model. Wetlands were mapped based on soil types from the Granit GIS database and edited based on high resolution satellite and LIDAR images. Lake bathymetry is from a 2021 mapping project by D. Yurewicz. Depth and location data were collected using Deeper Chirp sonar and loaded into GIS mapping software. Depth data were hand contoured and converted to depth polygons.
Page-Size Water Depth Maps for North and South Ends of Conway Lake
These two maps when laminated are useful to take on the lake. They show water depth, approximate position of buoys, and areas of shallow rocks and other hazards. Lake bathymetry is from a 2021 mapping project by D. Yurewicz. Depth and location data were collected using Deeper Chirp sonar and loaded into GIS mapping software (ArcMap). Depth data were hand contoured and converted to depth polygons.
Satellite Map of Conway Lake Area
This map includes high resolution satellite images acquired in 2015 and downloaded from the Granit GIS database (http://www.granit.unh.edu/)., as well as images from Google Earth acquired in 2018. The Google images were georegistered for location in ESRI's ArcMap. Parcel outlines were downloaded from the Granit GIS database and the parcels in Eaton were edited to better fit the outline of the lake. Roads were downloaded from the Granit GIS database and portions were edited using high resolution satellite images and LIDAR. Streams were digitized from USGS topographic maps and updated based on high-resolution satellite images and LIDAR. Lake bathymetry is from a 2021-2022 mapping project by D. Yurewicz. Depth and location data were collected using a Garmin Echomap UHD 73cv sonar and loaded into GIS mapping software (ESRI ArcMap) where data points were hand contoured.
LIDAR (Light Detection And Ranging) uses pulses of light emitted from a near-infrared laser mounted in a small aircraft to “scan” the land surface below. The collected data represent reflections from the ground, as well as any vegetation, buildings, or other solid surfaces. The raw data points are then processed to create a “bare earth” model which reveals topographic details as though all vegetation and buildings or other structures have been completely stripped away. The images in this map were also processed using a slope function that further accentuates topography – flat areas are white (like the surface of the lake) and the darker the shade of gray the steeper the slope.
These LIDAR images also provide historical evidence of early farming communities in this area. You can easily make out the stone walls that lined many of the roads and farm fields around the lake - the thin linear features are stone walls. You can also see cellar holes (foundations of abandoned buildings) as small rectangular features, and the old roadways that connected the farms. Many of those old farm fields have been abandoned and are now sitting hidden in the woods. You can explore more of NH's LIDAR images and learn about the statewide effort to map all the stone walls at the website “Wall-to-Wall: Connecting Landscape and Culture”. To see the LIDAR map of the Conway Lake area click here: LIDAR Map Conway Lake Area
Conway Lake Watershed Map
The Conway Lake watershed maps show the total area that drains into the lake from streams and runoff from rain and snow melt. The water that drains into the lake ultimately impacts water quality (e.g. turbidity, nutrients, pollutants), wildlife and plant habitats, and recreational use. The Conway Lake watershed encompasses approximately 22,400 acres and includes 19 smaller areas (catchments) that drain individual streams, or combinations of streams, into the lake. By far largest catchment is the Snow Brook Catchment which drains a large area south of the lake and includes Crystal Lake in Eaton.
Bedrock Geology Map
Bedrock geology was created from the Granit GIS database files. Data were compiled by geoscientists from academia and the U.S. Geological Survey, assembling and matching various map sources to produce the final compilation.