1789 A survey party under the direction of Captain Platt Rogers lays out a road through parts of the Schroon and Boquet valleys leading north to Plattsburgh and south to Sandy Hill.
1790 John McNeil arrives in Charlotte, Vermont. He soon establishes a ferry connection between Charlotte and Essex.
1809 The Vermont becomes the first steamer to sail Lake Champlain.
1819 The Ticonderoga becomes the first canal boat launched in its namesake village.
1823 The Champlain Canal opens, creating a navigable channel linking the lake and the Hudson River.
1828 Construction of the Cedar Point Road across Moriah, North Hudson, and Newcomb is authorized.
1850 Construction begins on a plank road connecting Elizabethtown and Westport.
1875 The Deleware and Hudson Railroad completes a line through Essex County along Lake Champlain.
1909 The Elizabethtown Terminal Railroad is incorporated to construct a spur line to Elizabethtown from the Westport train station but the rails were never laid.
1924 A former Hudson River sidewheeler renamed the Charlotte-Essex begins carrying automobiles across the lake.
1929 The Lake Champlain Bridge connecting Crown Point in New York and Chimney Point in Vermont is dedicated.
1935 Whiteface Memorial Highway opens.
1965 The Adirondack Northway is completed through Essex County.