Marshalls Creek Floodplain

Marshalls Creek flows into the Brunswick River approximately 1.2km from the mouth.

Townships within the Marshalls Creek catchment include: 

  • Billinudgel
  • South Golden Beach
  • New Brighton 
  • Ocean Shores.

The catchment is divided by the Pacific Highway and the rail corridor.

Upstream of the Pacific Highway the catchment is mostly agricultural and forested land.

The area downstream of the Pacific Highway is significantly developed. This is a mixture of urban (including a golf course) and forested areas.  

Flood behaviour in the Marshalls Creek catchment

Flood behaviour in this area is complex. There are many creeks and hydraulic connections, including:

  • Mooball Creek catchment in Tweed Shire 
  • Yelgun and Marshalls Creek catchments in Byron Shire.
  • Culverts underneath Kallaroo Circuit, Ocean Shores linking the catchments.

Depending on the flood levels, flow between Mooball and Marshalls Creeks can go in both directions. It can change during a single flood event. 

Lacks Creek and Marshalls Creek meet upstream of Billinudgel, where the floodplain increases in size. 

The flow is then restricted by the rail corridor before passing through the Pacific Highway bridges. 

Downstream of the Pacific Highway the floodplain is also large, with water backing up into the golf course area.

Significant flood events

  • May 1987 (this event is often referred to as “the Mothers Day Flood”)
  • March 1974
  • June 2005
  • March 2017
  • February and March 2022

A smaller event also occurred in January 2008.

Flood studies

North Byron Flood Study (adopted 2016)

This study combines the Marshalls, Simpsons and Brunswick Catchments using current flood modelling practices and the more detailed terrain modelling from a recent aerial laser survey. The study considers the urban areas of Mullumbimby, Brunswick Heads, Ocean Shores, New Brighton and South Golden Beach. Please see Brunswick River for further details on the North Byron Flood Study.

See supporting documents listed at the bottom of this page.  If you have any problems downloading please email council@byron.nsw.gov.au.

Tweed – Byron Coastal Creeks Flood Study (adopted 11 February 2010)

Byron and Tweed Councils jointly completed a flood study in 2009 which covers the Cudgen, Cudgera, Mooball, Yelgun and Marshalls Creeks. The Marshalls Creek catchment is the southern most catchment in this study and it covers an area of approximately 4200 hectares.

This study helped both Council’s better understand how the floodplain between the shires interacts across the shire boundary.

See supporting documents listed at the bottom of this page.  If you have any problems downloading please email council@byron.nsw.gov.au.

Marshalls Creek Floodplain Management Plan (adopted November 1997)

This document details the flood risks that are present in the catchment and Council's plan to mitigate them. A previous Marshalls Creek Flood Study was finalised in November 1986.  See supporting documents listed at the bottom of this page.

See supporting documents listed at the bottom of this page.  If you have any problems downloading please email council@byron.nsw.gov.au.

North Byron Floodplain Risk Management Study and Plan

The next phase for Council is to prepare the North Byron Floodplain Risk Management Study and Plan. The North Byron Flood Study will be used for the preparation of this document.  Until such time as the North Byron Floodplain Risk Management Study and Plan is adopted, the North Byron Flood Study (2016) and the Marshalls Creek Floodplain Management Plan (1997) should be considered for any flood planning matters.

The North Byron Floodplain Risk Management Study and Plan project is currently underway. Consultants WMA water have been engaged by Byron Shire Council for this project.

See supporting documents listed at the bottom of this page.  If you have any problems downloading please email council@byron.nsw.gov.au.

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