Park in 2013, honoring a former Boston Parks and Recreation Commissioner. The park opened in April 2017. Bridges Within the main section of the Back Bay Fens (Boylston Street to Avenue Louis Pasteur), three road bridges and two footbridges cross the Muddy River. The road bridges were designed by John C. Olmsted, Frederick Law Omlsted's adopted son. The largest and most significant is the Boylston Street bridge, designed as a "brilliant collaboration" between architect Henry Hobson Richardson (a frequent Olmsted collaborator) and the Olmsted firm. John Olmsted designed the main stone arch span, while Richardson added the tourelles flanking the arch. The foundation and abutments were built in 1880, though Richardson did not submit his design until July 1881. Cape Ann granite was not chosen as the material that December; although Richardson preferred rough boulders, seam-faced rock was used. The arch was constructed in 1883, and the bridge opened in 1884. The bridge was "totally different from any other masonry bridge of its day", and Shepley, Rutan and Coolidge applied its scale and materials to later structures along the Emerald Necklace. The Agassiz Road bridge, which connects Park Drive and the Fenway through the middle of the Fens, was designed by John Olmsted. It has five small brick arches, with granite abutments and piers supported by spruce piles driven into the marsh. The bridge is faced with Roxbury puddingstone salvaged from old walls in Franklin Park. Construction began in 1887 and was completed in February 1888; parapets were added when the road was paved in 1891. The Fen Bridge connects Park Drive and the Fenway at the west end of the Fens opposite Avenue Louis Pasteur. Also designed by John Olmsted, it is a masonry arch with a span. Like the Agassiz Road bridge, its abutments are granite supported by spruce piles and the facing is reused Roxbury puddingstone. Construction lasted from February to November 1891; the bridge opened with Audubon Road (now Park Drive) on January 3, 1892. The cost of the bridge was $27,699 (). The triangular median at the south end of the bridge was designated Higginson Circle after Henry Lee Higginson in 1920. The west parapet was removed in the 1950s when the Muddy River was culverted through the Longwood Entrance. A pair of footbridges are located on opposite sides of the Museum of Fine Arts: one across from Forsyth Way, the other north of Museum