Semaphore South flood map & planning overlays
A planning-constraint profile of Semaphore South
(City of Port Adelaide Enfield, SA) - 0.68 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
0.68 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Semaphore South'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 Semaphore South
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 26 Sep 2026
typical observed square 2 a day
Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude either way.
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.
Semaphore South at a glance
How Semaphore South is zoned
Selling in Semaphore South? 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 0.68 km², Semaphore South is highly constrained by planning overlays. About 30% of the suburb sits within a mapped flood overlay. There are 3 heritage-listed sites on record, and the dominant land-use zone is General Neighbourhood. The median lot measures about 435 m² across 622 parcels.
Who lives in Semaphore South
Census 2021 figures published by the ABS for the Semaphore South 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 1029, and decile 8 within South Australia. The national average is 1000.
Age profile
Share of Semaphore South's 1,031 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Largs Bay - Semaphore, the wider ABS statistical area containing Semaphore South. There is no annual population series published at suburb level, so this describes the surrounding area rather than Semaphore South itself.
13,971 in 2001 to 15,765 in 2025, up 13%.
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.
Semaphore South 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 26 September 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 Semaphore South 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 86% of Semaphore South. 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 Semaphore South lot.
See what's in the $9 report →Semaphore South planning - frequently asked
Is Semaphore South flood-prone?
About 30% of Semaphore South falls within a mapped flood overlay, against the council-wide suburb average of 17%.
Is Semaphore South bushfire-prone?
Bushfire mapping covers Semaphore South and little to none of it is mapped as bushfire-prone.
Is Semaphore South under a flight path?
Aircraft were observed below 3,000 ft over about 86% of Semaphore South, and over about 100% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 26 Sep 2026). The lowest measured aircraft was at 500 ft, with an average of 2,500 ft. At the busiest point in the suburb about 2 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 Semaphore South?
The dominant planning zone in Semaphore South is General Neighbourhood, though the suburb also includes Open Space and Recreation.
Does Semaphore South have heritage-listed places?
Semaphore South has 3 heritage-listed places on record.
What is the typical lot size in Semaphore South?
Across 622 surveyed parcels in Semaphore South, the median lot size is about 435 m².
Does Semaphore South have a train station?
There is no train station inside Semaphore South itself. The suburb is served by 6 bus stops.
What is the population of Semaphore South?
At the 2021 Census Semaphore South had 1,031 usual residents, with a median age of 44 and an average household size of 2.2 people. The wider Largs Bay - Semaphore statistical area, which contains Semaphore South, went from 13,971 people in 2001 to 15,765 in 2025, up 13%.
Is Semaphore South an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Semaphore South scores 1029 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 Semaphore South?
Median household income in Semaphore South was $1,676 a week at the 2021 Census, against $1,459 for the typical suburb in City of Port Adelaide Enfield. Median rent was $320 a week and the median mortgage repayment $1,842 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Ethelton | 0.8 km | 35% | 0% |
| Glanville | 0.9 km | 41% | 0% |
| Semaphore | 1.0 km | 23% | 0% |
| Exeter | 1.3 km | 24% | 0% |
| New Port | 1.3 km | 17% | 0% |
| Semaphore Park City of Charles Sturt |
1.7 km | 24% | 0% |
| Birkenhead | 2.0 km | 22% | 0% |
| West Lakes Shore City of Charles Sturt |
2.2 km | 20% | 0% |
| Peterhead | 2.5 km | 38% | 0% |
| Largs Bay | 2.5 km | 25% | 0% |