Phase 1B Underwater Archaeological Report for the Onondaga ...

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FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Anomaly 45: Concrete Breakwater Anomaly 45 Summary Table Anomaly Identification Breakwater of Concrete Bags; NY Site Number 06740.012304 Remedial Impact Dredge and Cap NRHP Eligibility Eligible as Contributing Property to Syracuse Maritime Historic District Recommendation Anomaly Dataset Side Scan (2005) No Magnetometer (2005) 705, 796, 810, 817, 732, 773, 766, 712, 797, 811 Side Scan (2010) 6/2/10 Sector Scan (2010) 6/7/10 ROV (2010) 6/10/10 Diver Observations 6/26/11 Diver Videography No Maps/Charts Yes Aerial Imagery Yes Historic Accounts No Research Results A45 is a breakwater situated southeast of the entrance to the Syracuse Inner Harbor. Analysis of navigational charts suggests that the structure was installed between 1937 and 1942 (Figure 62), and was abandoned/partially submerged by 1947. The breakwater is 20 feet wide (6.1m) and extends 250 feet (76.2m) from the shoreline (Figure 61). Dive verification in 2011 showed the site to be made of concrete bags, likely constructed by placing bags of concrete in the water. Each concrete block was pillow-shaped with two indentations from circular bands. Given the breakwater’s location, its intended purpose was likely to dampen wave action at the harbor entrance for entering and exiting boats. The structure is densely packed along the exterior walls of the breakwater with an open gap containing only sporadic concrete bags in between (Figure 63 and Figure 64). Only one tier is visible. The site lies in 2 to 3 feet (.61 to .91m) of water. No timber crib or other wooden structures were noted, suggesting that the site is a breakwater and not a pier. Figure 61. Aerial view showing A45 (courtesy Microsoft® Virtual Earth). 85
FINAL Phase IB Underwater Archaeological Resources Report for Onondaga Lake Superfund Site Figure 62. 1942 navigational chart of Onondaga Lake showing A45 (New York State Canals, Chart No. 185, 1942 (Detroit: U.S. Lake Survey Office, 1942). 86
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