OS 50K Symbols - Water features
Great Britain 1:50 000 Scale Colour Raster Mapping Extracts © Crown copyright Ordnance Survey. All Rights Reserved. Educational licence 100045616.
Contents
on Ordnance Survey 1:50,000 maps, with map extracts showing the symbols. On the maps a blue circle is on or near
the symbol. Use the mouse to move the pointer over the blue circle on a map to hide it.
Click on a thumbnail to see a page with a larger photo, other photo details, and a larger section of the
1:50,000 Ordnance Survey map.
The article Ordnance Survey Map Symbols

gives an introduction, and links to others in the set of articles.
Marsh or salting
Marsh SN1101 : Bridge on B4318 over stream through marshland
Salting SS8847 : Porlock Saltings

(also NO1919 : Downstream from Cairnie Pier, reed beds on mud)

River
NZ0914 : River Tees From Mortham

Lake
NY2031 : Bassenthwaite Lake & Skiddaw
Weir
SO9946 : River Avon at Fladbury
Footbridge
TQ5144 : Footbridge over the River Eden near Penshurst
Bridge
ST6172 : River Avon, New Brislington Bridge
Normal tidal limit
NO1026 : View across the Tay The "symbol" is in fact the end of the line along the river bank showing high water mark
Ford
NH8638 : Grouse Beaters cross a ford on the River Findhorn. (with word "Ford"; symbol can be dashed or continuous lines with blue of water showing through)This does not seem to be consistent; some fords have the word "ford", others don't have the word "ford".

Canal
NS8679 : Union Canal
Aqueduct
SP1660 : Edstone Aqueduct
Towpath
NR8091 : Crinan Canal and Towpath Symbol shown on OS key is the same as a footpath
SO8583 : Towpath at Dunsley Though not indicated in the OS key, the towpath may also be shown with a public right of way symbol if appropriate - a footpath in this case.

Lock
NS8981 : Lock at Bankside
Canal tunnel
SP6484 : Husbands Bosworth Tunnel (symbol not shown on OS key, it is same as road or rail tunnel)
Dry canal
SK6735 : The Grantham Canal at Cropwell Bishop, Nottinghamshire
Slopes
NZ4444 : Coastal Path near Easington Colliery
SX4348 : South Coast of Rame Peninsula

Cliff
SS6086 : Snaple Point looking West
Flat rock
HY4853 : Dull Flag
Shingle
HY2904 : Low tide in Clestrain Sound
Lighthouses
(in use)HY7855 : North Ronaldsay lighthouse and communications tower

(disused)
TM2530 : Disused lighthouse, Dovercourt, Essex

Beacon
SX2150 : Polperro: beacon
High water mark
SD2708 : Formby beach
Low water mark
SS6389 : The tide is turningAlthough it is included in the OS list of symbols, there isn't an actual symbol -
it is shown by blue sea one side and one of the types of land, sand, mud or marsh the other side.

Sand
(below high water)HY6739 : Peedie Sea, Sanday

Dunes
(above high water)SD2809 : Behind the Foredunes

Mud
NO1919 : Downstream from Cairnie Pier
Great Britain 1:50 000 Scale Colour Raster Mapping Extracts © Crown copyright Ordnance Survey. All Rights Reserved. Educational licence 100045616.