Relief shown by contours, isolines and spot heights.
Surveyed in 1890.
Contour interval 5 feet.
Henry Gannett, chief topographer; R.U. Goode, geographer in charge; triangulation by U.S. Coast and Geodetic Survey; topography compiled by H.L. Baldwin Jr. from U.S. coast and geodetic survey, and U.S. public land surveys.