[6] Just upstream of Grafton, the river was impounded by a U.S. Army Corps of Engineers dam in 1938 to form Tygart Lake.

[5] At the United States Geological Survey's stream gauge in Philippi, the annual mean flow of the river between 1940 and 2005 was 1,922 ft³/s (54 m³/s).

[10] At an upstream gauge near the community of Dailey in Randolph County, the annual mean flow of the river between 1915 and 2005 was 358 ft3/s (10 m3/s).

[11] The brothers John and Samuel Pringle, who had taken up residence along the Buckhannon tributary of the Tygart (in present Upshur County) in 1761, acted as their contemporary Daniel Boone was doing in Kentucky and guided numerous immigrant settlers into the main valley of the Tygart which at that time abounded in game and fertile bottomlands.

Settlers of the 1770s and '80s included the Connelly, Hadden, Jackson, Nelson, Riffle, Stalnaker, Warwick, Westfall, Whiteman and Wilson families.