Where is the cable and pipeline area located in the Duwamish Waterway?

The correct location of the cable and pipeline area in the Duwamish Waterway is near the 1st Avenue South bridge. This area is significant for its infrastructure related to utility services, specifically the placement of cables and pipelines which are critical for transportation and communication utilities. The proximity to the bridge is essential as it acts as a reference point for navigating and managing these utilities in conjunction with other infrastructure and waterways.

While the other options present potential locations within the Duwamish Waterway, they do not accurately represent the designated area for cables and pipelines. Options such as just south of the main shipping channel or near Terminal 18 may involve different infrastructure considerations, while the entrance of the East Waterway relates more to access points rather than utility networks. Thus, the selection of the area near the 1st Avenue South bridge reflects both the utility needs and the geographical layout of the Duwamish Waterway.