The Blockhouse had a bronze tablet commemorating its history placed above the door, placed on June 10, 1905. The ceremony was performed by Mary Van Buren Vanderpoel, president of the Women's Auxiliary to the American Scenic and Historic Preservation Society. Receiving the plaque was General Frederick Dent Grant. The plaque was stolen from its location and was noticed to be missing on March 28, 1913. The plaque was documented in a copyrighted picture and was located above the door. The plaque read "This blockhouse was part of a line of fortifications extending from the Hudson to the Harlem River built for the defense of New York by patriotic citizens during the war of 1812-1815. This tablet is erected by the Women's Auxiliary to the American Scenic and Historic Preservation Society A.D. 1905". In 1999, the Blockhouse had a new sign erected, describing its history. However, the second plaque has also now gone missing.
