| distance | reference number | name | latitude | longitude |
| 1.7 | 2284 | Plum Island, Merrimack River Entrance, Merrimack Ri | 42.8167 | -70.82 |
| 1.8 | 1989 | Newburyport, Merrimack River, Massachusetts | 42.8117 | -70.865 |
| 4.8 | 2635 | Salisbury Point, Merrimack River, Massachusetts | 42.8383 | -70.9083 |
| 6.0 | 2283 | Plum Island Sound (south end), Massachusetts | 42.71 | -70.7883 |
| 6.4 | 1209 | Hampton Harbor, New Hampshire | 42.9 | -70.8167 |
| 9.1 | 1811 | Merrimacport, Merrimack River, Massachusetts | 42.825 | -70.9883 |
| 10.6 | 934 | Essex, Massachusetts | 42.6317 | -70.7767 |
| 12.9 | 77 | Annisquam, Lobster Cove, Massachusetts | 42.655 | -70.6767 |
| 14.3 | 2552 | Riverside, Merrimack River, Massachusetts | 42.7633 | -71.0767 |
| 15.5 | 1110 | Gloucester Harbor (Ten Pound Island), Massachusetts | 42.61 | -70.66 |
| 15.8 | 2571 | Rockport, Massachusetts | 42.6583 | -70.615 |
| 16.1 | 2903 | Squamscott River RR. Bridge, Piscataqua River, New | 43.0533 | -70.9133 |
| 16.5 | 2633 | Salem Harbor, Salem, Massachusetts | 42.5233 | -70.8767 |
| 16.9 | 1408 | Jaffrey Point, Portsmouth Harbor, Maine | 43.0567 | -70.7317 |
| 17.4 | 1130 | Gosport Harbor, Isles of Shoals, New Hampshire | 42.9783 | -70.615 |
| 17.8 | 2436 | Portsmouth, Portsmouth Harbor, New Hampshire | 43.0783 | -70.7517 |
| 18.0 | 2726 | Seavey Island, Portsmouth Harbor, Maine | 43.08 | -70.7417 |
| 18.1 | 2727 | Seavey Island, Portsmouth Harbor, Maine (sub) | 43.0833 | -70.75 |
| 18.2 | 111 | Atlantic Heights, Piscataqua River, New Hampshire | 43.09 | -70.7667 |
| 18.3 | 1033 | Fort Point, New Hampshire | 43.0717 | -70.7117 |
| 18.3 | 1034 | Fort Point, Portsmouth Harbor, New Hampshire | 43.0717 | -70.7117 |
| 18.4 | 1099 | Gerrish Island, Portsmouth Harbor, New Hampshire | 43.0667 | -70.695 |
| 19.0 | 1532 | Kittery Point, Portsmouth Harbor, Maine | 43.0817 | -70.7033 |
| 19.3 | 805 | Dover Point, Piscataqua River, New Hampshire | 43.1167 | -70.8333 |
| 20.4 | 2721 | Seapoint, Cutts Island, Maine | 43.085 | -70.6617 |