THE EXISTING CONDITIONS of the circa 1967 twin culverts on the Ipswich River beneath Chestnut Street, near Rte. 62, are visible in this photo. The culverts provide an existing span of 32 feet, 9 inches. Each culvert is 9 feet, 2 inches high and 13 feet, 8 inches wide. From bank to bank, the Ipswich…