Going north the first bridge you get to is the old railway bridge which is just as you turn right from the harbour so you wont get far that way. You can get right in to Beccles if you head south and you can almost get up to Norwich if you head west.
You can not go north broads at all with out lowering mast at Gt Yarmouth.2 fixed bridges once past Haven bridge which will with Breydon bridge open if booked in advance. South Broads is accessable across Breydon water then bear right (Yare)towards Norwhich to avoid fixed bridge at St Olaves and either carry on up towards Norwhich where Reedham swing will open (ch12)on request subject to trains, or turn left towards Beccles a road bridge approx 20 feet(tidal) with pontoons for mooring whilst lowering/waiting and then Somerlayton bridge which will also open. O.K then untill Beccles or alternative Oulton broad. once past the two fixed at Gt Yarmouth Acle is the next bridge. www.broadsnet.co.uk may also assist. firstname.lastname@example.org if more info required The south broads are quieter and less hire boats at this time of year.
You can't get right up to Beccles mast-up which is a pity.
The "new" bridge is some 400m downstream of Beccles old bridge, the limiting one with air draft maybe 6 -7ft at low water but the Broads Authority website will confirm this.
Don't let this put you off though. Moor downstream of the new bridge and explore the lovely and thriving town, and do your best to carry on the next 4 miles to the head of navigation in your dinghy - some of the most beautiful water in the entire Broads network. Your reward is the fabulous Locks Inn at Geldeston - a pub from the 15th century lit by gas mantles and candles in the middle of the marshes and serving the most stupendous range of home brewed ales...Don't miss it for anything!
And if you pass a 12 ft clinker built rowing boat moored under the trees on that stretch say a kindly hello to Mr Jeremy Fisher, the last of his kind on the Waveny. You may even meet us en route to the pub, for at 50 years old he is still the best means of transport I know for getting to the best beer I know...as well as being the best way to explore one of the most beautiful stretches of water anywhere!