River Ash, Surrey

River Ash
Reach with wider banks, reeds and woodland close to Shepperton Studios
The southernmost inner west-east line marks the end of the river, the rest is wholly in the same Borough shown.
Location
Country/Nation	United Kingdom
Region/Country	England
County	Surrey
City	Sunbury-on-Thames, Shepperton, Littleton 51°24′25″N 0°28′08″W / 51.407°N 0.469°W / 51.407; -0.469, Laleham, Ashford, Staines-upon-Thames
Physical characteristics
Source	Sluice against lower River Colne
• location	Staines-upon-Thames, Spelthorne, England, United Kingdom
• elevation	14 m (46 ft)
Mouth	River Thames
• location	Sunbury-on-Thames and Shepperton, Spelthorne, England, United Kingdom
• elevation	8.6 m (28 ft)
Length	10 km (6.2 mi)[1]
Width
• minimum	2 feet (0.61 m)
• average	6 feet (1.8 m)
• maximum	20 feet (6.1 m)
Depth
• minimum	0.5 feet (0.15 m)
• average	1.5 feet (0.46 m)
• maximum	5 feet (1.5 m)
Basin features
Progression	Colne—Ash—Thames
Artificial extra source: outflow of un-useable water from fresh waterworks

v t e River Ash and North Thames Reservoirs
Legend
Thames 1. 2. Intake of aqueduct (with sluice) Colne Brook County or Shire Ditch Wraysbury River Colne (feeder of the three above) Ash Pumping Station to 3. & 4. & 5. overflow sluice to the Ash Gravity-drained aqueduct  A308  road (River Ash under aqueduct)  A308  road Pumping Station to 6. Ashford Treatment Works for 6.  A244  road Kempton Treatment Works (some water sent directly to below) 7.Grand Junction Reservoir Hampton Treatment Works 8. Thames

The River Ash is a small, shallow river in Surrey, England. Its course of 10 kilometres (6.2 mi) is just outside Greater London. Work has been carried out to re-align, clear and build up a small, Littleton head of water and create two backwaters. One backwater dates to the medieval period; the other to the 1990s. It flows as one of the six distributaries of the River Colne from the south of Staines Moor immediately south of the Staines Bypass eastwards through the rest of the borough of Spelthorne before meeting the River Thames.

It is not navigable to craft and is rich in plant and insects, particularly reeds, diverse sedges (many of which commonly called bulrushes), pond-skaters, amphibians and lepidoptera (moths and butterflies). It enhances the Ash Link Nature Reserve, Studios Walk woodland biodiversity site and two parks. It is recognised as a key ecological feature within its borough.^[1]