The Lakes and Rivers hydrographic polygon data layer was created to accurately depict the location and shape of flowing water features greater than five feet in width and major standing water bodies in Cook County.

The Lakes and Rivers hydrographic polygon data layer was created to accurately depict the location and shape of flowing water features greater than five feet in width and major standing water bodies in Cook County.

The Rivers and Streams data set represents, as a single line, the interpreted midline of flowing water features as seen on the aerial photography.

The Rivers and Streams data set represents, as a single line, the interpreted midline of flowing water features as seen on the aerial photography.