Avon River (Western Australia)

Avon
River
Avon River flowing through the Avon Valley National Park
Country	Australia
State	Western Australia
Region	Wheatbelt
Part of	Swan River
Tributaries
- left	Dale River
- right	Mackie River, Mortlock River, Brockman River
Landmark	Quajabin Peak
Source	surface runoff
- location	East of Pingelly
- elevation	269 m (883 ft)
- coordinates	32°44′52″S 117°28′0″E / 32.74778°S 117.46667°E / -32.74778; 117.46667
Mouth	confluence with Wooroloo Brook to form the Swan River
- location	below Mount Mambup
- elevation	29 m (95 ft)
- coordinates	31°44′34″S 116°4′4″E / 31.74278°S 116.06778°E / -31.74278; 116.06778Coordinates: 31°44′34″S 116°4′4″E / 31.74278°S 116.06778°E / -31.74278; 116.06778
Length	240 km (149 mi)
Basin	125,000 km2 (48,263 sq mi)
Discharge	for mouth
- average	10 m3/s (353 cu ft/s)
National park	Avon Valley National Park
Lakes, pools and reservoirs	Lake Yealering, Burlong Pool, Robins Pool, Long Pool, Cobblers Pool and Jimperding Pool
Location of the Avon River and its catchment area

The Avon River is a river in Western Australia. A tributary of the Swan River, the Avon flows 240 kilometres (150 mi) from source to mouth, with a catchment area of 125,000 square kilometres (48,000 sq mi).

Lake Yealering in the Shire of Wickepin is the point of origin for the upper Avon River, and the catchment size above the confluence with the Salt River at Yenyenning Lake is 91,500 square kilometres (35,300 sq mi).

The basin covers much of West Australian wheatbelt and extends beyond that in some areas near almost-always-dry Lake Moore in the northeast, water is received regularly from only the extreme western edge of the basin. Indeed, until an abnormally wet year in 1963 it was not realised that the northeastern part of the basin beyond Wongan Hills ever drained water into the river. Under present climatic conditions, it is almost impossible to produce runoff from anywhere outside the extreme west of the basin because the amount of rain required to fall before runoff would begin is as high or higher than the mean annual rainfall. The river has three main sub-catchments: catchments for the Mortlock, Yilgarn, and Lockhart rivers.

The river flows past Quajabin Peak, creating a picturesque view from the top.

Thirty creeks and rivers flow into the Avon, some of the larger tributaries include the Dale River, Brockman River, Mortlock River and the Mackie River. Most of these watercourses are ephemeral and only flow after rain events in winter and spring.

Some permanent pools exist along the course of the river including Burlong Pool, Robins Pool, Long Pool, Cobblers Pool and Jimperding Pool.