On July 2, 1801, the lighthouse was completely destroyed by fire. The merchants of Plymouth and Duxbury erected a temporary beacon at their own expense. On April 6, 1802, Congress appropriated $270 to reimburse them. At the same time Congress also appropriated $2,500 “for rebuilding the lighthouse on Gurnet.” Twin lights were built and the Thomas family was paid $120 for the land on which the new lighthouses were constructed.
Joseph Burgess succeeded his father as keeper on October 16, 1812, and remained in charge of the light until 1851.
Congress appropriated $5,000 in 1836 “for preserving the point of land leading to the fort and lighthouse at the Gurnet, in Duxbury, by hurdles or double ranges of piles.”
Lt. Edward W. Carpender, USN, reported on November 1, 1838, that the Gurnet light beams were horizontal rather than perpendicular as other lighthouse beams were. “They require to be double to distinguish them from the single light at Barnstable. They are in separate towers, 22 feet high and 30 feet apart. They consist * * * of a single series of six lamps each, with old 8½-inch reflectors, arranged in a circular form, so as to suit the harbor as well as sea navigation. Their elevation is 70 feet above the level of the sea, enabling them to be seen * * * 19 miles.”
Carpender pointed out that the lights were too close together, causing them to blend and appear as a single light at a short distance. Also being horizontal they “were likely to come into a range with each other, by which they also appear single.” Carpender’s remedy for this was to convert them from horizontal to perpendicular beams, but his suggestion was never carried out.
In 1842 the Gurnet lighthouses were rebuilt and the new structures, while still of wood, each had a distinctive design. In 1871 the lights were of the sixth order and were declared by the Lighthouse Board to be “entirely too small” and “readily mistaken for the lights in a dwelling house, when they can be seen at all.” Their distance apart was also too short to afford an efficient range. Nothing ever came of the recommendation that they be replaced with fourth-order lights “separated by a proper distance for an effective range.”
After 1851, Thomas Treble followed Joseph Burgess as keeper. His successors were William Sears, Milton Reamy, Edward S. Gorham, Henry L. Pingree, and A. S. Eisener. Keeper Davis in 1929 had a long list of rescues to his credit, and keeper Reed rescued the crew of the mine sweeper U. S. S. Swan stranded on Gurnet Beach on November 28, 1930.
Gurnet Light had lost its importance as a light as Plymouth Harbor lost its shipping traffic over the years. Not until Cape Cod Canal was opened in 1914 did the lighthouse again become an important coastal beacon.
In 1924 the northeast tower was discontinued and the station is now described as a white, octagonal, pyramidal tower, with white dwelling, 39 feet above ground and 102 feet above water. Its 700,000 candlepower, fourth-order electric light shows group flashing white every 20 seconds and is visible for 16 miles. An air diaphragm horn blasts for 3 seconds every 15 seconds during fog. [(5)]