Originally Posted by Searider
Will a 4.3 give us enough depth?
I've been down to Portsbridge this evening and walked from the western end to the railway bridge. I arrived there just under an hour after low water, and the creek had water along the full length (and was clearly flowing in from the western end). The shallow and most narrow point was where the high footbridge crosses both the A27 and the creek, about 400m from the Portsbridge end. At that point, there was no more than a few inches of water, and a collection of bikes, shopping trolleys and other debris was clearly visible.
Judging by the high water marks on the concrete parapets of the bridges, I'd estimate a high water draft of 8 to 10 feet, so even if we assume those high water marks are on a 5m tide, I reckon we should have no less than a 6ft (1.8m) under us at high water on the 7th.
At the second footbridge, which is close to the railway bridge and about 2/3 of the way along the creek, a number of metal or wooden poles protrude from the mud and stand near upright to a level that would see them just below the surface at high water. They are close to the southern parapet of the centre span of the footbridge but I'd advise staying well away from that side of the span when we make our passage.
I didn't continue to the Eastern Road (Langstone Harbour) end as the light was starting to fade, but Google satellite images suggest there shouldn't be any difference in draft through this section, so long as we follow the channel.
Hope this is helpful and I'm certainly more confident having walked the route.