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Black Dam Roundabout

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Black Dam Roundabout
Location Map ( geo)
Cameraicon.png View gallery (7)
Highway Authority
National Highways
Junction Type
Roundabout and Spur
Roads Joined
M3, A30, A339
Junctions related to the A339

Black Dam Roundabout is the roundabout at the north end of the spur from junction 6 of the M3, though the name is commonly applied to both this junction and the main roundabout under the M3.

The junction started out as a T junction between London Road and Coronation Road (later called Grove Road). By the 1960s, the A30 had been diverted down Grove Road, and this junction became a large T-junction with priority towards Grove Road. The A339 now took the old route into Basingstoke.

When the M3 opened, the main Black Dam Roundabout was built. The A339 moved onto a new route heading north from here. A smaller T-junction remained in place to the west. To the east, it has been pointed out that a seemingly random section of dual carriageway was provided in just the right place for a future flyover to land here - this may have been the intention.

Within a couple of years, Ringway South had been built. Both Grove Road and the old London Road route into Basingstoke were disconnected from the main junction, and traffic for those roads now had to use the new junction to the west. Ringway South had space for a flyover.

High traffic levels have been a common problem for this junction. In 1989, an improvement proposal titled "A339 Black Dam GSJ" added to the Trunk Road forward programme, with an expected cost of £5 million; which had risen to £7.6 million for a 1.0 mile D2 scheme by 1994. It was withdrawn from the programme in the November 1995 review along with a large number of other schemes.

During 2016, the northern roundabout was majorly reconfigured. The junction was fully signalised and there was an additional road added to the middle of the roundabout that allows traffic from the M3 and A30 westbound to avoid going around the roundabout, turning the junction into a hamburger.


Route To Notes


The SOUTH WEST, Southampton, Winchester


London, Guildford, Farnham


Basingstoke (A339), Alton (A30), Reading (A33) spur to Black Dam Roundabout


The SOUTH WEST, London spur to M3


Ring Road (N), Town centre, Newbury, Reading (A33), Daneshill, Chineham, Houndmills


Ring Road (S), Alton (A339), Viables


Old Basing

Black Dam Roundabout
Related Pictures
View gallery (7)
Bas+Plans+6.jpgBas+Plan.jpgBasingstoke, Ringway East - Footbridge near Black Dam Roundabout - Geograph - 4152618.jpgA30 to Old Basing - Geograph - 1182314.jpgBlack Dam Roundabout 1973.jpg
Junctions on the M3, A303 and A316
A316Hogarth Roundabout • Chalkers Corner • Manor Circus • Richmond Circus • St. Margarets Roundabout • London Road Roundabout • Whitton Road Roundabout • Hospital Bridge Roundabout • Apex Corner • Waterworks Roundabout • Sunbury Cross
M3Sunbury Cross • Shepperton • 2 Thorpe • 3 Bagshot • 4 Frimley • 4A Minley • 5 Hook • 6 Black Dam • 7 Dummer • 8 Popham • 9 Winnall  • 10 Bar End • 11 Hockley Cross • 12 Allbrook • 13 Leigh Road • 14 Chilworth
A303Popham • Overton Road • Micheldever • Bullington Cross • Barton Stacey • Longparish • Picket Twenty • Winchester Road • Salisbury Road • Hundred Acre • Thruxton • Quarley • Parkhouse Cross • Double Hedges • Folly Bottom • Countess Roundabout • Stonehenge Bottom • Longbarrow Roundabout • Deptford • Furzehedge • Mere • Tinkers Hill • Wincanton • Chapel Cross • Hazelgrove Roundabout • Camel Cross • Podimore Roundabout • Ilchester Mead • Cartgate Roundabout • Hayes End Roundabout • Southfields Roundabout • Eagle Cross • Marsh • Stopgate Cross • Devonshire House
Junctions on the A30
London -
Henlys Roundabout • Hatton Cross • Terminal 4 Roundabout • Clockhouse Roundabout • The Bull Dog • Crooked Billet • Runnymede Interchange • Runnymede Roundabout • Egham Hill Roundabout • Black Dam Roundabout • Hackwood Road Roundabout • Winchester Road Roundabout • Brighton Hill Roundabout • Kempshott Roundabout • Hatch Warren Roundabout • Dummer • Popham • Bullington Cross • Lopcombe Corner • St Marks Roundabout • Royal Chase Roundabout • Ivy Cross Roundabout • Bellmans Cross • Hospital Roundabout • Horsey Roundabout • Quicksilver Roundabout • Bunfield Hollow Roundabout • Bellmans Cross • Southay Cross • Devonshire House • Cheneys Farm Interchange • Langford Junction • Turks Head Junction • Pattesons Cross Junction • Iron Bridge Junction • Daisymount Junction • Country House Interchange • Pound Corner • Blackhorse Interchange • Sowton Interchange
Exeter -
Land's End
Pearce's Hill • Alphington • Fingle Glen • Woodleigh • Whiddon Down • Tongue End • Meldon • Sourton Cross • Stowford Cross • Liftondown • Tavistock Road Junction • Pennygillam • Trebursye • Kennards House • Two Bridges • Plusha • Fivelanes • Cannaframe • Bolventor • Temple Tor • Temple • Preeze Cross • Cardinham Downs • Callywith • Carminow Cross • Innis Downs • Victoria • Highgate Hill • Fraddon • Summercourt • Mitchell • Carland Cross • Boxheater • Chybucca • Chiverton Cross • Scorrier • Avers • Tolvaddon • Treswithian • Loggans Moor • St Erth Roundabout • Newtown Roundabout • Chy-An-Mor • Branwell Lane • Chyandour • Heamoor • Mount Misery
Basingstoke Ring Road
 • Winchester Road Roundabout  • Hackwood Road Roundabout  • Basingstoke Ring Road


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