Hogsmill River

Hogsmill
The Hogsmill at Kingston as it flows into the Thames
Location of the mouth in Greater London
Location
Country	England
Counties	Surrey, Greater London
Districts / Boroughs	Epsom and Ewell, Royal Borough of Kingston upon Thames
Towns	Ewell, Old Malden, Berrylands, Kingston upon Thames
Physical characteristics
Source	Bourne Hall Park
• location	Ewell, Surrey
• coordinates	51°21′01″N 0°15′03″W / 51.350313°N 0.250945°W / 51.350313; -0.250945
Mouth	River Thames
• location	Kingston upon Thames
• coordinates	51°24′33″N 0°18′30″W / 51.40917°N 0.30833°W / 51.40917; -0.30833
Length	9.9 km (6.2 mi)
Basin size	73 km2 (28 sq mi)
Discharge
• location	Kingston upon Thames
• average	0.98 m3/s (35 cu ft/s)
• minimum	0.33 m3/s (12 cu ft/s)9 September 1976
• maximum	26.3 m3/s (930 cu ft/s)6 August 1981
Discharge
• location	Ewell
• average	0.04 m3/s (1.4 cu ft/s)
Basin features
Progression	Hogsmill, Thames, North Sea
Tributaries
• left	Horton Stream, Bonesgate Stream, Green Lanes Stream, Tolworth Brook
• right	Ewell Court Stream

v t e Hogsmill River Map
Legend
River Thames Riverside Promenade Wadbrook Street bridge Clattern Bridge St James's Road bridge  A307  Wheatfield Way bridge Hogg's Mill Springfield Road bridge Mill Street bridges Kingston University Halls of residence Kingston Middle Mill Villiers Road bridge Chapel Mill Hogsmill STW South West Main Line Tolworth Brook  A3  Kingston by-pass Chessington branch line Worcester Park gunpowder mills  A240  Kingston Road bridge Bonesgate Stream Ruxley STW  B284  Ruxley Lane bridge Horton Stream Ewell Court gunpowder mills Ewell Court Stream Green Lanes Stream Sutton and Mole Valley lines Ewell Lower Mill Ewell Upper Mill  B2200  Chessington Road bridge Source in Bourne Park

The Hogsmill River in Surrey and Greater London, England, is a small chalk stream tributary of the River Thames. It rises in Ewell and flows into the Thames at Kingston upon Thames on the lowest non-tidal reach, that above Teddington Lock.

The river is 10 km (6 mi) long and has a catchment area of about 73 km² (28 sq mi).^[1] Nearby land was formerly flood-meadows; following improvements it is now mostly sports grounds, a sewage treatment works and green space, save for Kingston and Epsom town centres. It is a habitat of many animals, fish and insects.

The 12th-century Clattern Bridge, one of the oldest road bridges in England, crosses the river in the southwest of Kingston town centre.^[2] The Coronation Stone, now sited close to the river in Kingston, is believed to have been used for the coronation of Saxon kings in the 10th century. It was used as a horse mounting block until 1850 when it was mounted on a plinth in the town centre.

The river has five tributaries: Green Lanes Stream, Ewell Court Stream, Horton Stream, Bonesgate Stream and Tolworth Brook.