About Great Bay Marine Inc
Founded in 1956, Great Bay Marine is New Hampshire Seacoast’s only year-round, full-service boating facility. Located six miles up the Piscataqua River, we serve Rockingham county, plus surrounding counties and states along the New England Seacoast. This location is ideal for most shopping, grocery, and transportation needs. 128 Slips accommodating 13′ to 70′ LOA Available 30A & 50A Power and Fresh Water Free High Speed Wireless 72 Moorings, Dedicated Dinghy Dock 4 Moorings at Hilton Park for Tall Rig Sailboats Transient Slip & Mooring Availability
Facilities
Electricity
PetrolDiesel
Water
Wifi
Showers
Sewage
Toilets
Recycling
HauloutCOORDINATES
43.11636 N, -70.83558 E
Port Information
Telephone
Berth Sizes
10-20m
Depth at MLW
2 - 3m
Manoeuvrability
Fair
Channel Marking
Fair
Overseas Visitor Berths
Yes
Catamaran Berths
Yes
Dock Type
Floating
Style Side To
Yes
Style Stern To
Yes
Tidal Flow
Negligible
Active Winter
Yes
Weather Forecast
Tue
5AM - 9AM
19 May 2026
SW 5–8 knots. Gusts up to 18 knots.
Increasing from 15 to 24°C
SE 0.5m at 7s period
UV Index: 0 - Low
Partly cloudy
Tue
9AM - 1PM
19 May 2026
- W 7 knots increasing to 11 knots. Gusts up to 20 knots.
- Increasing from 25 to 31°C
- SE 0.5m at 7s period
- UV Index: 8 - Very High
- Partly cloudy
Tue
1PM - 5PM
19 May 2026
- W 10 knots. Gusts up to 20 knots.
- 28 to 31°C
- SE 0.4m at 8s period
- UV Index: 8 - Very High
- Cloudy