You selected a Black Locust:
Robinia pseudacacia L.
Pinnately compound, 6-12 in. 7-19 egg-shaped leaflets, 1-2 in., paired except at end. Without teeth.
White, fragrant, showy, ¾ - 1 in. Large clusters 4-8 in. long. 5 unequal petals. May-June.
Small short side buds. Lacks terminal bud.
Grey with reddish tinge. Deeply grooved bark with interlacing ridges.
Central and southern U.S. Naturalized in New England. Native to North America but not to Vermont
Very rot-resistant wood. 2-4 in. flat pods containing dark brown seeds which mature in autumn. Thorny branches