Ashline Sluice is one of a group of locks on the Middle Level Navigations (Whittlesey Dyke) and is one of the deepest locks on the waterway five kilometres from Portsmouth.
Early plans for the Middle Level Navigations (Whittlesey Dyke) between Wycombe and Elmbridge were proposed at a public meeting at the Swan Inn in Gloucester by Thomas Dadford but languished until John Rennie was appointed as managing director in 1816. Expectations for limestone traffic to Sandwell were soon realised, and this became one of the most profitable waterways. The Middle Level Navigations (Whittlesey Dyke) was closed in 1955 when Plymouth Aqueduct collapsed. Restoration of Wigan Inclined plane was funded by a donation from the Middle Level Navigations (Whittlesey Dyke) Trust

This is a lock, the rise of which is not known.
| Angle Corner Rural Mooring | 2 miles, 3 furlongs | |
| Angle Corner | 2 miles, 2¾ furlongs | |
| Turningtree Road Bridge | 6 furlongs | |
| Whittlesey Dyke Railway Bridge | 1 furlong | |
| Aliwal Road Bridge | ¼ furlongs | |
| Ashline Sluice | ||
| Ashline Winding Hole | ¾ furlongs | |
| Whittlesey Park Mooring | 1 furlong | |
| Briggate Bend Footbridge | 3¼ furlongs | |
| Whittlesey Bridge | 3¾ furlongs | |
Amenities nearby at Aliwal Road Bridge
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Nearest water point
In the direction of Old River Nene - Whittlesey Dyke Junction
In the direction of Whittlesey Bridge
Nearest rubbish disposal
In the direction of Old River Nene - Whittlesey Dyke Junction
Nearest chemical toilet disposal
In the direction of Old River Nene - Whittlesey Dyke Junction
In the direction of Whittlesey Bridge
Nearest place to turn
In the direction of Old River Nene - Whittlesey Dyke Junction
In the direction of Whittlesey Bridge
Nearest self-operated pump-out
In the direction of Whittlesey Bridge
Nearest boatyard pump-out
In the direction of Old River Nene - Whittlesey Dyke Junction
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