The light at Pemaquid was originally built during the presidency of John Quicy Adams, in 1827, at a cost of $2,800. Faulty construction was blamed for the quick deterioration of the tower, which was rebuilt with double walls in 1835. The tower is only 38 ft tall, but it's placement on a rock ledge gives the light a 79 ft. focal plane. Flashing a white light every 6 seconds, Pemaquid's fourth-order fresnel is visible for 14 miles. The restoration of the 1835 lighthouse took eight weeks to complete at a cost of $106,000 in 2007. Cold winters and salt air damage is repaired in the spring.