Lonsdale flood map & planning overlays

A planning-constraint profile of Lonsdale (City of Onkaparinga, SA) - 9.68 km², mapped from live council and state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.

Suburb-wide figures; the free map shows which overlays touch your lot.

Planning schematicLonsdale

Constraint readout

9.68 km² - this suburb is highly constrained by planning overlays.

Flood overlay 0%

below council avg (4%) · #28 of 47 mapped council suburbs

Bushfire-prone 47%

below council avg (69%) · #32 of 47 mapped council suburbs

Environmental4%

below council avg (12%) · #22 of 47 in council

Heritage sites 2 Noise corridor <1% Aircraft seen below 3,000 ft 20% Mostly Strategic Employment Bushfire 32nd most affected of 47 →

Elevation hillshade with street names, clipped to Lonsdale's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.

Nearby suburbs, nearest first

Aircraft noise and flight paths over Lonsdale

Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.

Observed overflight - sampled 4 Sep to 3 Oct 2026

Under observed aircraft

82%

of the suburb, at or below 10,000 ft

Below 3,000 ft

20%

of the suburb's area

Lowest measured

500 ft

averaging 6,000 ft

Busiest square

~39 a day

1 a day below 3,000 ft · ±15%
typical observed square 6 a day

Night movements: observed, lowest 2,000 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.

Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.

Lonsdale at a glance

Parcels 1,023 Median lot 2,000 m² Bus stops 21

How Lonsdale is zoned

Strategic Employment 83%

Infrastructure 6%

Employment 4%

Resource Extraction 2%

Open Space 2%

Conservation 1%

Selling in Lonsdale? The zone and overlays on this page are the Planning and Design Code controls a Form 1 vendor's statement has to disclose.

Across its 9.68 km², Lonsdale is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 47% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Strategic Employment. The median lot measures about 2,000 m² across 1,023 parcels.

Who lives in Lonsdale

Census 2021 figures published by the ABS for the Lonsdale suburb boundary itself, not a wider region.

Population

usual residents, 2021

Population trend, 2001 to 2025

Estimated resident population of Lonsdale, the wider ABS statistical area containing Lonsdale. There is no annual population series published at suburb level, so this describes the surrounding area rather than Lonsdale itself.

25 in 2001 to 26 in 2025, up 4%.

Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.

Lonsdale data sources and coverage

“Not mapped” means we hold no source layer for this suburb - never an all-clear.

Dataset	Coverage	Publisher
Flood mapping	Mapped	the South Australian Planning and Design Code and Location SA spatial data
Bushfire-prone mapping	Mapped	the South Australian Planning and Design Code and Location SA spatial data
Zoning	Mapped	the South Australian Planning and Design Code and Location SA spatial data
Heritage and environment	Mapped where published	the South Australian Planning and Design Code and Location SA spatial data
Aircraft noise contours (ANEF)	Not held	the South Australian Planning and Design Code and Location SA spatial data, Defence
Observed flight paths	Observed	adsb.lol, under the Open Database License
Demographics	Available	Australian Bureau of Statistics (2021 Census and SEIFA)

Profile last materially updated 3 October 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.

Check a specific Lonsdale address

See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.

Aircraft have been seen below 3,000 ft over about 20% of Lonsdale. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.

Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Lonsdale lot.

See what's in the $9 report →

Lonsdale planning - frequently asked

Is Lonsdale flood-prone?

Flood mapping covers Lonsdale and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 4%).

Is Lonsdale bushfire-prone?

Around 47% of Lonsdale is mapped as bushfire-prone, compared with a City of Onkaparinga average of 69%.

Is Lonsdale under a flight path?

Aircraft were observed below 3,000 ft over about 20% of Lonsdale, and over about 82% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 6,000 ft. At the busiest point in the suburb about 39 aircraft a day were recorded passing over one 500 m square. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.

What is the zoning in Lonsdale?

The dominant planning zone in Lonsdale is Strategic Employment, though the suburb also includes Infrastructure and Employment.

Does Lonsdale have heritage-listed places?

Lonsdale has 2 heritage-listed places on record.

What is the typical lot size in Lonsdale?

Across 1,023 surveyed parcels in Lonsdale, the median lot size is about 2,000 m².

Does Lonsdale have a train station?

There is no train station inside Lonsdale itself. The suburb is served by 21 bus stops.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
O'Sullivan Beach	2.2 km	0%	78%
Christie Downs	2.6 km	0%	0%
Reynella	3.0 km	<1%	0%
Christies Beach	3.3 km	0%	37%
Morphett Vale	3.8 km	2%	25%
Noarlunga Centre	3.9 km	0%	0%
Hallett Cove City of Marion	3.9 km	0%	0%
Hackham West	4.6 km	0%	0%
Sheidow Park City of Marion	4.8 km	0%	0%
Old Reynella	4.8 km	2%	23%

See all City of Onkaparinga suburb profiles →