How to Read a Lake Map

Lake maps contain a large amount of information. Like other maps, they can be confusing, but with a little background knowledge, lake maps can be very useful helping people avoid underwater hazards, as well as for providing data about water depth. Swimmers, boaters and anglers can all benefit from the types of information provided by lake maps.

Things You'll Need

• Compass (optional)

Instructions

1. Read the map key. Much of the information you will need to know can be found here, such as the symbols used to represent dams or areas where streams and creeks feed into the lake. The map key may also indicate the type of lines used to map the shoreline.

2. Note the various colors on the map. Usually lake maps are printed in various shades of blue, with darker blues representing deeper water.

3. Examine the lines on the map. These are called contour lines and show where the water depth changes. Lines that are close together indicate a rapid change in depth, whereas lines that are farther apart indicate a more gradual change in water depth.

4. Know the numbers. Some maps label the distance between contour lines. Others indicate the actual depth rather than the distance between depth changes. The map key should give you an indication of how the map is labeled.

5. Look over your map and key for structures. Lake maps will show where certain things are underneath the water. Old roads, cemeteries, house foundations, bridges and other objects found on the lake bed are often marked on the map. Dams and the distance from them will also be labeled.

6. 

   Look for pathways. If a lake contains many shallow areas or debris, map makers will often chart the best route for boaters to take from one area of the lake to another.

Tips & Warnings

• As with other maps, North is usually clearly labeled on a lake map. Using a compass along with your lake map may help you to get your bearings. If you plan on fishing in the lake, knowing the habits of the species you plan to fish for will allow you to use a lake map to know where certain types of fish are likely to be, and when.