Carthagena Lock No 7 is one of some locks on the Lee and Stort Navigation (River Lee); it was rebuilt after it collapsed in 1905.
The Act of Parliament for the Lee and Stort Navigation (River Lee) was passed on 17 September 1888 the same day as that of The Leeds and Liverpool Canal. Expectations for iron traffic to Northcorn never materialised and the canal never made a profit for the shareholders. In 1972 the canal became famous when Cecil Wood made a model of Runton Tunnel out of matchsticks to encourage restoration of Barbury Aqueduct.

Facilities: water point.
There is a bridge here which takes pedestrian traffic over the canal.
This is a lock with a rise of 5 feet.
| Broxbourne Bridge No 51 | 4½ furlongs | |
| Old Nazeing Road Wharf | 4¼ furlongs | |
| The Crown PH | 4¼ furlongs | |
| Nazeing New Road Bridge No 52 | 1½ furlongs | |
| Carthagena Lock Weir Exit | ¾ furlongs | |
| Carthagena Lock No 7 | ||
| Carthagena Lock Weir Entrance | ½ furlongs | |
| Dobb's Weir Lock Weir Exit | 5¾ furlongs | |
| Dobbs Weir Lock No 6 | 6 furlongs | |
| River Palace Café & Restaurant | 7½ furlongs | |
| Dobb's Weir Road Bridge No 55 | 7¾ furlongs | |
Amenities nearby at Carthagena Lock Weir Entrance
The water point here is alongside the lock chamber.
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Nearest water point
In the direction of Hertford Town Mill Bridge
In the direction of Waltham Town Lock No 11
Nearest rubbish disposal
In the direction of Hertford Town Mill Bridge
In the direction of Waltham Town Lock No 11
Nearest chemical toilet disposal
In the direction of Hertford Town Mill Bridge
In the direction of Waltham Town Lock No 11
Nearest place to turn
In the direction of Waltham Town Lock No 11
In the direction of Hertford Town Mill Bridge
Nearest self-operated pump-out
In the direction of Hertford Town Mill Bridge
In the direction of Waltham Town Lock No 11
Nearest boatyard pump-out
In the direction of Waltham Town Lock No 11
In the direction of Hertford Town Mill Bridge
Wikipedia has a page about Carthagena Lock
Carthagena Lock (No7) is a lock on the River Lee Navigation at Broxbourne












![It's That Boat Again. Narrowboats do average [[4922061]] where there are locks to navigate by Glyn Baker – 23 April 2016](https://s2.geograph.org.uk/geophotos/04/92/20/4922066_8979ef7e_120x120.jpg)









![Lea Navigation at Nazeing. This is the stretch of river also seen in [[161097]]. Photo taken from Nazeing New Road bridge [[1444029]]. by Stephen Craven – 15 August 2009](https://s2.geograph.org.uk/geophotos/01/44/40/1444034_70e4e03d_120x120.jpg)


![Downstream from Cartheagena Lock. A much nicer cloudscape than a little earlier at [[4922027]] by Glyn Baker – 23 April 2016](https://s0.geograph.org.uk/geophotos/04/92/20/4922080_ca524ee3_120x120.jpg)




