I also have a William Riley Beach as son of Abraham Beach BUT born in 1796 and died in 1850.
Abraham was brother to Issac, Benjamin, Sarah, Enoch, Annie, Susannah, Allie, William and Justus Jr.
BUT I also have another William Riley Beach (1825 - 1870) as son of William M. Beach and Eliza Kirby Beach. Wife was Cornelia Caroline Beach (born Barlow).