An oil tanker struck a pier at the Memorial Bridge that connects the state to Maine, but there was no apparent damage to the bridge itself, the New Hampshire Transportation Department said. Bill Boynton of the Transportation Department said the 600-foot-long oil tanker Seapride was outbound on the Piscataqua River when it struck a pier of the lift bridge at about 5:15 a.m. Friday. The US Coast Guard said the ship had offloaded ultralow-sulfur diesel and was headed back out when the accident happened. No injuries or pollution were reported. Boynton said the fender system designed to protect each bridge pier was damaged.