- Helena River
The Helena River is a tributary of the Swan River in
Western Australia . The river rises in country east ofMount Dale and moves to the north west to Mundaring Weir, where it is dammed. It then flows west until it reaches the Darling Scarp.It passes through the western edge of the
Darling Scarp between Gooseberry Hill, and Greenmount Hill before joining the Swan River at the southern edge of the historic town now suburb of Guildford.Catchment area
Many of the tributaries of the Helena River are un-named due to their seasonality and size. However on the northern side of the catchment
Nyaania Creek and on the southern sidePiesse Brook are significant in their moving through built up areas which makes them susceptible to urban environment issues.Upper Helena catchment (i.e. above Mundaring Weir) has on the north side of Lake C.Y. O'Connor (formerly the Helena River Reservoir) a range of named creeks that occur in State Forest no 71 and 13:
*Manns Gully
*Chinaman Gully
*Jones Gully
*Michael Gully
*Chauncy Gully
*Middle Brook
*Helena Brook
*Hancock Brook
*Emu Brook
*Warin BrookEnvironment
In the higher ground the Helena River passes mainly through State Forest or reserve. This has been beneficial for some of the catchment area, as it has been an important buffer between the urban settlements in the Mundaring and Kalamunda areas. The flora of the Helena valley has been recognised as being of importance because of the relative richness.
It is at Darlington, and the locality of Helena Valley that there is housing and agriculture on its banks before it emerges out on to the
Swan Coastal Plain .At Bellevue and Midland the river has historically passed hazardous industrial sites. This includes the
Midland Railway Workshops site and the Midland livestock sale yards.Dams
It is dammed in two places - the best known is the upper river dam known as Mundaring Weir which was part of
C.Y O'Connor 'sGoldfields Water Supply Scheme .Since the lower dam - known as the Pipehead Dam has been constructed in the 1970's, flooding of the lower Helena River (in East Guildford and Guildford) has been substantially reduced. Most of the water collected in the Pipehead Dam is pumped back into Mundaring Weir. Due to this, restrictions in the Helena River catchment have been made to not allow activities that affect the quality of the Pipehad Dam - despite being adjacent to the built up areas within the
Shire of Mundaring on the north side of the Helena River catchment.Bridges
The bridges design and strength were of releavnt to higher water flow prior to the construction of the pipehead dam, as significant flooding occurred in the early and mid twentieth century.
The main bridges are at: -
* Below Mundaring Weir
* Helena Valley Locality
* Bellevue - Reid Highway
* Midland -
* Woodbridge -
* East Guildford -
* Guildford -References
*
*Siemon, Nicole (2001) "Foreshore assessment in the Helena River catchment" East Perth, W.A. Water and Rivers Commission. Water resource management series, 1326-6934; report no. WRM 20.ISBN 0730974960
*
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