Siston Brook

Siston Brook
Clack Mill Brook
Londonderry Wharf Bridge crossing the Siston Brook as it joins the Bristol Avon
Diagrammatic map of the Siston Brook and tributaries in South Gloucestershire, England
Location
CountryEngland
RegionSouth Gloucestershire
Physical characteristics
Source 
 • locationSiston, South Gloucestershire, England
 • coordinates51°28′48″N 2°26′55″W / 51.4799°N 2.4487°W / 51.4799; -2.4487
 • elevation338 ft (103 m)
2nd source 
 • locationSiston, South Gloucestershire, England
 • coordinates51°28′38″N 2°27′01″W / 51.4773°N 2.4503°W / 51.4773; -2.4503
 • elevation305 ft (93 m)
Source confluence 
 • locationSiston, South Gloucestershire, England
 • coordinates51°28′28″N 2°26′52″W / 51.4744°N 2.4478°W / 51.4744; -2.4478
 • elevation246 ft (75 m)
MouthRiver Avon
 • location
Londonderry Wharf, South Gloucestershire, England
 • coordinates
51°25′36″N 2°29′18″W / 51.4268°N 2.4883°W / 51.4268; -2.4883
 • elevation
35 ft (11 m)
Length6 mi (9.7 km)
Basin features
Tributaries 
 • rightWarmley Brook
River systemBristol Avon

Siston Brook rises in two separate streams which issue from a ridge just north of the village of Siston, South Gloucestershire, England. The brook is approximately 6 miles (9.7 km) long and is a tributary of the Bristol Avon. Much of its course is through the eastern suburbs of Bristol, although it remains outside the city boundaries. Tributaries include the Warmley Brook and an unnamed tributary from Bridgeyate.

The stream has provided power for watermills and battery mills in the past and some mill buildings still survive. Wildlife is supported by nature reserves through which the Siston Brook runs. Flooding has caused problems in the past, but modern measures to alleviate this include an attenuation reservoir and proposals to reinstate historic weirs and sluices. The name Siston is believed to derive from Anglo-Saxon, meaning Sige's Farmstead.