Jackson Saltwater River Western Branch, Gisborne Creek, Macedon River, Saltwater River, Saltwater Creek[1]
The narrow valley cut by Jackson Creek near Clarkefield
Contour map of the Maribyrnong River basin; Jackson Creek rises midpoint between the 400–500-metre (1,300–1,600 ft) contour line.
Etymology	After early Colonial settlers, 'Hungry' William Jackson[2]
Location
Country	Australia
State	Victoria
Region	Victorian Midlands (IBRA), Greater Melbourne
Local government area	Macedon Ranges Shire
Suburbs	Gisborne, Sunbury
Physical characteristics
Source	Macedon Ranges, Great Dividing Range
Source confluence	Distill, Gisborne and Slaty creeks
• location	within Rosslynne Reservoir, northwest of Gisborne
• coordinates	37°28′9″S 144°34′4″E / 37.46917°S 144.56778°E / -37.46917; 144.56778
• elevation	459 m (1,506 ft)
Mouth	confluence with the Deep Creek to form the Maribyrnong River
• location	west of Melbourne Airport
• coordinates	37°40′10″S 144°48′16″E / 37.66944°S 144.80444°E / -37.66944; 144.80444
• elevation	42 m (138 ft)
Length	71 km (44 mi)
Basin features
River system	Port Phillip catchment
Tributaries
• left	Riddells Creek
• right	Longview Creek
National park	Organ Pipes NP
[3]

The Jackson Creek (sometimes referred to as Jacksons Creek^[1]) is a watercourse within the Port Phillip catchment, located in the outer northern suburbs of Melbourne, in the Australian state of Victoria.

Formed by the confluence of the Distill, Gisborne and Slaty creeks that drain the southern parts of the Macedon Ranges, part of the Great Dividing Range through the Black Forest, the Jackson Creek rises northwest of Gisborne, within the Rosslynne Reservoir. The creek flows east, then south, then south by east, joined by two minor tributaries before reaching its confluence with the Deep Creek to form the Maribyrnong River west of Melbourne Airport.^[3] In its upper reaches the creek flows east in a broad shallow valley in the Bullengarook area, then enters the deeper, narrower valley that characterises the remainder of the watercourse. The creek flows through the town of Gisborne before turning generally southwards to flow through Sunbury eventually to join with Deep Creek south of Bulla, where the two waterways form the Maribyrnong River. The deep and relatively narrow valley cut by the creek in its southward course through the surrounding basalt plains is particularly prominent at such places as Emu Bottom and the Organ Pipes National Park.^{[citation needed]} The creek descends 417 metres (1,368 ft) over its 71-kilometre (44 mi) course.^[3]

The incised meanders of the Jackson Creek demonstrate the downcutting of the Newer Volcanics and have formed rapids and small falls, along with outcrops of columnar basalts and tessellated pavements, for example at the Organ Pipes National Park near the Calder Freeway, a prominent display of basaltic columns so named because they look like organ pipes. Upstream, a bluestone flour mill near the falls south of Sunbury harnessed the major drop in river levels.^[4]

The creek was named after the early Colonial settlers William Jackson and his brother, Samuel,^[2] who named the township of Sunbury after Sunbury-on-Thames, in Surrey, England when it was established in 1857.^{[citation needed]}

By inference, as Deep Creek has been called the east branch of the Maribyrnong River,^[5] Jackson Creek could be considered the west branch.^{[citation needed]} The creek has also historically been called Saltwater River Western Branch, Gisborne Creek, Macedon River, Saltwater River, and Saltwater Creek.^[1][6]

Named and other significant bridges and crossing points along Jackson Creek include:

• Holden Bridge (early concrete beam bridge replacing an earlier ford on Bulla - Diggers Rest Road)
• Jacksons Creek bridge (Sunbury, historic twin arch bluestone bridge, pedestrians only)
• Sunbury railway viaduct (constructed 1859 for Bendigo Rail Line)
• Black Hill Bridge (Settlement Road)
• Old Jacksons Creek Bridge (pedestrians only)
• Jacksons Creek Bridge (Riddell Road)
• Calder Freeway
• Gisborne - Kilmore Road
• Aitken Street
• Waterloo Flat Road

• List of rivers in Australia
• Yarra River