Cygnet River flood map & planning overlays
A planning-constraint profile of Cygnet River
(Kangaroo Island Council, SA) - 50.44 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.
Constraint readout
50.44 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Cygnet River's boundary, with the flood, bushfire and environmental overlays drawn on top. Amber hatching is the published aircraft noise (ANEF) contour. 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 Cygnet River
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.
Inside an aircraft noise contour
6% of the suburb's land sits inside a published ANEF or airport-environs contour. Contours vary street by street, so whether a particular lot is inside one needs a property-level check.
Contours held
- SA Planning and Design Code aircraft noise
Observed overflight - sampled 4 Sep to 3 Oct 2026
typical observed square 1 a day
Night movements: observed, lowest 500 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.
Cygnet River at a glance
How Cygnet River is zoned
Selling in Cygnet River? 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 50.44 km², Cygnet River is highly constrained by planning overlays. About 28% of the suburb sits within a mapped flood overlay, and 90% is flagged bushfire-prone. There are 4 heritage-listed sites on record, and the dominant land-use zone is Rural. The median lot measures about 306,560 m² across 91 parcels.
Who lives in Cygnet River
Census 2021 figures published by the ABS for the Cygnet River suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 1024, and decile 8 within South Australia. The national average is 1000.
Age profile
Share of Cygnet River's 72 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Kangaroo Island, the wider ABS statistical area containing Cygnet River. There is no annual population series published at suburb level, so this describes the surrounding area rather than Cygnet River itself.
4,227 in 2001 to 5,212 in 2025, up 23%.
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.
Cygnet River 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) | Inside a held contour | 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 Cygnet River 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 64% of Cygnet River. 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 Cygnet River lot.
See what's in the $9 report →Cygnet River planning - frequently asked
Is Cygnet River flood-prone?
About 28% of Cygnet River falls within a mapped flood overlay, against the council-wide suburb average of 7%.
Is Cygnet River bushfire-prone?
Around 90% of Cygnet River is mapped as bushfire-prone, compared with a Kangaroo Island Council average of 96%.
Is Cygnet River affected by aircraft noise?
About 6% of Cygnet River sits inside a published aircraft noise contour. ANEF contours are forecasts published per airport and used to control noise-sensitive development; they are not a measurement at any one house, and a property can sit under a flight path and outside every contour.
Is Cygnet River under a flight path?
Aircraft were observed below 3,000 ft over about 64% of Cygnet River, and over about 80% 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 2,500 ft. At the busiest point in the suburb about 5 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 Cygnet River?
The dominant planning zone in Cygnet River is Rural, though the suburb also includes Conservation and Infrastructure (Airfield).
Does Cygnet River have heritage-listed places?
Cygnet River has 4 heritage-listed places on record.
What is the typical lot size in Cygnet River?
Across 91 surveyed parcels in Cygnet River, the median lot size is about 306,560 m².
Does Cygnet River have a train station?
There is no train station inside Cygnet River itself. The suburb is served by 2 bus stops.
What is the population of Cygnet River?
At the 2021 Census Cygnet River had 72 usual residents, with a median age of 40 and an average household size of 2.6 people. The wider Kangaroo Island statistical area, which contains Cygnet River, went from 4,227 people in 2001 to 5,212 in 2025, up 23%.
Is Cygnet River an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Cygnet River scores 1024 and sits in decile 8 of 10 nationally and decile 8 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Cygnet River?
Median household income in Cygnet River was $949 a week at the 2021 Census, against $1,249 for the typical suburb in Kangaroo Island Council. Median rent was $230 a week and the median mortgage repayment $1,465 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Brownlow Ki | 6.3 km | 48% | 88% |
| Menzies | 7.4 km | 0% | 100% |
| Kingscote | 7.9 km | 6% | 92% |
| Birchmore | 9.0 km | 0% | 100% |
| Wisanger | 9.5 km | 3% | 99% |
| Bay Of Shoals | 10.4 km | 13% | 94% |
| Nepean Bay | 12.4 km | 16% | 90% |
| Emu Bay | 12.7 km | 5% | 98% |
| Kohinoor | 14.1 km | 0% | 100% |
| North Cape | 14.4 km | 8% | 94% |