Sunrise on a misty morning - photo courtesy of Don Yurewicz
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.
Index map of the lake showing the location of all 17 Zones:
This map also shows the extent of the littoral and profundal zones in Conway Lake. The littoral zone is the nearshore area of a lake in which light penetration to the lake bottom is sufficient to support photosynthesis and aquatic plant growth. For the lakes of this region that commonly corresponds to water depths less than 15 feet. While we focus on the very shallow portions of the littoral zone in our patrols, it is important to remember that invasive plants can grow from greater depths towards the surface. Index Map
Page-size Maps of Each Patrol Zone:
Zone 8 - Lower East Shore Zone 9 - Upper South Cove Zone 10 - Middle South Cove Zone 11 - Lower South Cove Zone 12 - Lower Pennacook Cove Zone 13 - Upper Pennacook Cove Zone 14 - Breezy Point to Ship Island Zone 15 - Ship Island to Picnic Island Zone 16 - Picnic Island to Walker Island Zone 17 - Walker Island to Andrews Point
Summary Maps of Completed AIS Patrols - End of Season:
These maps show the areas covered by AIS Patrol over the course of the growing season (June - late September).
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
Topographic Map of Conway Lake 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. Lake bathymetry contours were downloaded from the Granit GIS database, and 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.
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 contours were downloaded from the Granit GIS database.
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.