Bridge, this somber stone and brick Romanesque Revival engine house and tower was sited near Shaft 25. Six machines powered by coal, were capable of pumping 14 million gallons a day. Type Significance(s) Interpretation Structure Guide 179TH STREET HIGH SERVICE WORKS 1894 (Demolished) Plate 29B-, New Croton Aqueduct Appendix 135TH STREET GATEHOUSE 1884-1890 (Adaptive Reuse - Harlem Stage) Plate 30-12, Old/ New Croton Aqueduct Sign For more information, see fiche on page XXX. Type Significance(s) Interpretation Sign AMAWALK AUXILLARY DAM 1897 Plate 9-, New Croton Aqueduct Current Designation(s) Earthen with a length of 400 feet and height of 25 feet, the Amawalk Auxiliary Dam is sited on the west side of the Amawalk Reservoir. 142ND STREET GATEHOUSE c 1840 (Demolished) Plate 30-5, Old Croton Aqueduct In conjunction with a gatehouse near 135th Street in the center of Amsterdam Avenue, the 142nd Street Gatehouse regulated the northern inlet of the Manhattan Valley Siphon. Type Significance(s) Current Designation(s) Interpretation Sign For more information, see fiche on page XXX. Type Significance(s) Interpretation Sign Current Designation(s) Current Designation(s) 5 AMAWALK DAM 1897 Plate 9-, New Croton Aqueduct Type Earthen with a masonry core, the Amawalk Dam runs across a valley of the Muscoot River. Its length is 1270 feet with a height of 82 feet. The earthen portion of the dam is broken by a 50 foot spillway with an ogee curve profile. For more information, see fiche on page XXX. Type Significance(s) Interpretation Sign Current Designation(s) Interpretation Current Designation(s) AMAWALK GATEHOUSE 1889-1896 Plate 9-, New Croton Aqueduct Located south of the main dam, the gatehouse receives water from the tower and sends it to the fountain-basin for aeration. AMAWALK RESERVOIR 1889-1896 Plate 9-, New Croton Aqueduct Formed by impounding the middle of the Muscoot River, the Amawalk Reservoir has a capacity of 6.7 billion gallons of water. It is named after the town of Amawalk, which was submerged when the reservoir was constructed. Sign Significance(s) Interpretation Sign Current Designation(s) AMAWALK TOWER 1889-1896 Plate 9-, New Croton Aqueduct A 32 X 34 foot tower, located near the base of the main dam, is divided into two chambers. Water is drawn from the reservoir and sent through a tunnel on the dam side that connects with the gatehouse. Type Significance(s) Current Designation(s) 6 Sign Current Designation(s) Type Aeration is achieved with this 50 foot diameter fountain. From the fountain-basin, water flows to the channel of the spillway. Significance(s) Interpretation For more information, see fiche on page XXX. AMAWALK FOUNTAIN 1897 Plate 9-, New Croton Aqueduct Type Significance(s) Interpretation Sign ARDSLEY OPEN-CUT c 1888s Plate 24-11, New Croton Aqueduct A single arched granite bridge stretching 160 feet, the Archville Bridge carried the Croton Aqueduct across the Albany Post Road. Type Significance(s) Interpretation Type Significance(s) Interpretation Structure Guide See Fiche on page XX for more information. The open-cut is a portion of the New Croton Aqueduct that was run through an open trench when soil and rock conditions were not conducive to boring. Appendix ARCHVILLE BRIDGE 1837-1842 (Demolished 1924) Plate 22-4, Old Croton Aqueduct Sign Sign Current Designation(s) Current Designation(s) BARNHILL TRIANGLE 1999-2000 Plate XX ARDSLEY GATEHOUSE c 1890s Plate 24-10, New Croton Aqueduct A masonry substructure with a 37 X 55 foot chamber divided by an overflow weir, the Ardsley Gatehouse is similar in form to the two other gatehouses placed between Croton Lake and the Harlem River. Here, where the aqueduct is considerably below the surface of the ground, waste water is carried nearly 800 feet through a culvert to the Saw Mill River. Type Significance(s) Interpretation Sign A vacant traffic island with plantings reaching into the cross section of the Old Croton Aqueduct running beneath it. For more information, see fiche on page XXX. Type Significance(s) Interpretation Sign Current Designation(s) Current Designation(s) 7 BOG BROOK BASIN FOUNTAIN c 1891 Plate 5-, New Croton Aqueduct Type Aeration of the water from the Bog Brook Reservoir is achieved with a 30 foot diameter fountain with vertical jets. Type Significance(s) Interpretation Sign BOG BROOK DAM NUMBER 1 1889-1893 Plate 5-, New Croton Aqueduct Modestly comprised of an earthen embankments with masonry core walls embedded in solid rock, the dam spans 1340 across Bog Brook and rises 60 feet high. The inner wall is covered in paving, while the top and outer wall are sodded. For more information, see fiche on page XXX. Significance(s) Interpretation Sign Current Designation(s) BOG BROOK DAM NUMBER 2 1891-1893 Plate 5-, New Croton Aqueduct Spanning 1956 feet, Bog Brook’s smaller dam is 24 feet high. The inner wall is covered in paving, while the outer wall is sodded. For more information, see fiche on page XXX. 8 Interpretation Sign Current Designation(s) BOG BROOK GATEHOUSE 1891 Plate 5-, New Croton Aqueduct Outflow is regulated at Bog Brook Reservoir by a 25 X 27 foot