Carthagena Lock (No7) is a lock on the River Lee Navigation at Broxbourne
| Carthagena Lock | |
|---|---|
 Below the lock | |
 | |
| 51°44′37″N 0°00′08″W / 51.743566°N 0.002108°W | |
| Waterway | River Lee Navigation |
| County | Hertfordshire Essex |
| Maintained by | Canal & River Trust |
| Operation | Manual |
| Length | 85 feet (25.9 m) |
| Width | 16 feet (4.9 m) |
| Fall | 5 feet (1.5 m) |
| Distance to Bow Creek | 17.5 miles (28.2 km) |
| Distance to Hertford Castle Weir | 8.8 miles (14.2 km) |
Location
editDirectly behind the lock is Carthagena Weir part of a fishery which also includes two lakes and a section of the Old River Lea.
To the east of the lock is the Nazeing Mead complex of lakes which incorporate part of the River Lee Flood Relief Channel.
Public access
editVehicular access via B194 Nazeing New Road
Pedestrian and cycle access via the towpath which forms part of the Lea Valley Walk
There is a water point for boats. The tap is in the lock.