Hello everyone. I'm planning to go fishing at a new place this weekend and i have acquired a map of the lake. I am trying to locate the underwater points on the map using the contour lines. Can anyone point me in the right direction of what i should be looking for? I've never read a lake map before.

Here's an example of what those lines mean.

Let's see how bad I can confuse y'all  

A topographic map is that the shape of the Earth's surface is shown by contour lines. Contours are imaginary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height, depths, and steepness of slopes.

Topographic contours are shown in brown by lines of different widths. Each contour is a line of equal elevation; therefore, contours never cross. They show the general shape of the terrain. To help the user determine elevations, index contours are wider. Elevation values are printed in several places along these lines. The narrower intermediate and supplementary contours found between the index contours help to show more details of the land surface shape. Contours that are very close together represent steep slopes. Widely spaced contours or an absence of contours means that the ground slope is relatively level. The elevation difference between adjacent contour lines, called the contour interval, is selected to best show the general shape of the terrain.