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 granite masonry gatehouse at the center of Bog Brook Dam Number 1. Also containing a waste weir, the gatehouse admits water at three elevations. Current Designation(s) Type Significance(s) Type Significance(s) Interpretation Sign Current Designation(s) BOG BROOK RESERVOIR 1892 Plate 5-, New Croton Aqueduct The Bog Brook Reservoir was formed by damming Bog Brook, a small tributary of the East Branch of the Croton River. It has a holding capacity of 4.4 billion gallons and drainage basin of 4 miles. For more information, see fiche on page XXX. Type Significance(s) Current Designation(s) Interpretation Sign Type Part of the compound reserved for the overseer of Boyd’s Corners. Type Significance(s) Interpretation Sign Current Designation(s) Structure Guide BOYD’S CORNERS KEEPER’S HOUSE c 1870s (Status Unknown) Plate 1-, Old/ New Croton Aqueduct A structure of unknown dimensions and form served as the home for the overseer of Boyd’s Corners. BOYD’S CORNERS DAM 1866-1870 (Demolished 1980s) Plate 1-, Old/ New Croton Aqueduct Simple in design, the Boyd’s Corners Dam was 670 feet long and 57 feet high. Stretching across the West Branch of the Croton River, the masonry dam was faced in ashlar and had a concrete core. Boyd’s Corners Dams was one of the first dams to utilize concrete technology. The overflow spilled down a wasteway cut from the natural bedrock. For more information, see fiche on page XXX. Significance(s) Interpretation Sign Current Designation(s) Type Significance(s) Appendix BOYD’S CORNERS BARN c 1870s Plate 1-, Old/ New Croton Aqueduct Interpretation Sign Type Significance(s) Interpretation Sign Current Designation(s) BOYD’S CORNERs RESERVOIR 1873 Plate 1-, Old/ New Croton Aqueduct The damming of the middle of the West Branch of the Croton River submerged the village of Boyd’s Corners and formed a reservoir with a capacity of 2.7 billion gallons. For more information, see fiche on page XXX. Current Designation(s) Type Significance(s) Interpretation Sign BOYD’S CORNERS GATEHOUSE 1866-1873 Plate 1-, Old/ New Croton Aqueduct A small stone gatehouse located at the base of the downstream face. Current Designation(s) 9 CARMEL AUXILIARY DAM 1890 Plate 3-, New Croton Aqueduct Type Constructed one mile southwest of main dam, the Carmel Auxiliary Dam is 800 feet wide and 50 feet high. Earthen with a masonry core, provisions were made for a highway to cross along its 22 feet wide of top. Type Significance(s) Interpretation Sign CARMEL AUXILIARY DAM GATEHOUSE 1890 Plate 3-, New Croton Aqueduct Located in the center of the Carmel Auxiliary Dam, the gatehouse contains a single water chamber 5 X 17 feet in size. Significance(s) Interpretation Sign Current Designation(s) CARMEL DAM 1890 Plate 3-, New Croton Aqueduct With a spillway functioning as an overflow weir, the Carmel Dam stretches across West Branch of the Croton River running 1800 feet long and rising 65 feet. The masonry portion is flanked on each side by earthen dam. The upstream face is paved in stone while the downstream side is sodded. 10 Interpretation Sign Current Designation(s) CARMEL DAM GATEHOUSE 1890 Plate 3-, New Croton Aqueduct Constructed on the north side of the spillway, the gatehouse has one inlet chamber and two outlet chambers to control the flow of the reservoir. Current Designation(s) Type Significance(s) Type Significance(s) Interpretation Sign Current Designation(s) CARMEL OVERFLOW WEIR 1890 Plate 3-, New Croton Aqueduct Faced with blue-gray limestone, the Carmel Overflow Weir is 260 feet in length and 53 feet high. Type Significance(s) Current Designation(s) Interpretation Sign Type Comprised of two dams impounding the West Branch of the Croton River, the Carmel Reservoir has a capacity to contain 9 billion gallons of water. Significance(s) Interpretation Sign CENTRAL PARK 1858-1870 Plate 32-14 An urban oasis designed by Frederick Law Olmsted and Calvert Vaux, Central Park embraced the Old Croton Aqueduct in design. Significance(s) Sign Current Designation(s) COAL INCLINE AND RAILROAD, HIGH SERVICE WORKS - HIGH BRIDGE 1873 (Demolished) Plate 29, Old Croton Aqueduct Supporting the High Service Works located at the end of High Bridge, the dock and incline were built with a hoisting engine erected for delivering coal to the boiler house. Current Designation(s) Type Interpretation Interpretation Sign Current Designation(s) CLENDENING VALLEY BRIDGE 1839-1841 (Demolished 1870) Plate 30-9, Old Croton Aqueduct Emerging near 95th Street, the aqueduct spans the once rural Clendening Valley on a solid masonry