| Key | Value |
| alt_name | Gangway Rock |
| ele | 0 |
| gnis:feature_id | 617655 |
| hazard | yes |
| natural | reef |
| note | This group of rocks is called Half Tide Rocks, and formerly contained one rock called Gangway Rock, but it was removed under a US Army contract in the 1880s (see note:ref). This group of rocks is still called Gangway Rock in some modern maps. |
| note:ref | 1881 Report of the Chief of Engineers U.S. Army, Part 1 --- page 512 |
| note:ref:source | https://books.google.com/books?id=p8dIAAAAMAAJ&pg=PA513&lpg=PA513&dq=newburyport+gangway+rock&source=bl&ots=_cYzSH33tZ&sig=0RGFa6BT36gG9QrR42nK76cNVTU&hl=en&sa=X&ved=0ahUKEwjQ97b6quzYAhVJNd8KHWEcAL0Q6AEIWTAM#v=onepage&q=newburyport%20gangway%20rock&f=fals |
| reef | rock |
| seamark:rock:water_level | covers |
| seamark:type | rock |
| source | MapQuest Open Aerial |
| source:alt_name | http://www.historicmapworks.com/Map/US/1568299/Newburyport/ |
| source:name | Newburyport 1 From Essex County 1884 (http://www.historicmapworks.com/Map/US/13823/Newburyport+1/Essex+County+1884/Massachusetts/) |
| tidal | yes |