Mount Observation flood map & planning overlays
A planning-constraint profile of Mount Observation
(Alexandrina Council, SA) - 8.21 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
8.21 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount Observation'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 Mount Observation
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
Night movements: observed, lowest 7,000 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.
Mount Observation at a glance
How Mount Observation is zoned
Selling in Mount Observation? 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 8.21 km², Mount Observation is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Rural. The median lot measures about 318,140 m² across 25 parcels.
Who lives in Mount Observation
Census 2021 figures published by the ABS for the Mount Observation 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 994, and decile 6 within South Australia. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of Strathalbyn Surrounds, the wider ABS statistical area containing Mount Observation. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mount Observation itself.
5,223 in 2001 to 8,615 in 2025, up 65%.
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.
Mount Observation 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 Mount Observation 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.
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 Mount Observation lot.
See what's in the $9 report →Mount Observation planning - frequently asked
Is Mount Observation flood-prone?
Flood mapping covers Mount Observation and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 16%).
Is Mount Observation bushfire-prone?
Around 100% of Mount Observation is mapped as bushfire-prone, compared with a Alexandrina Council average of 100%.
Is Mount Observation under a flight path?
Aircraft were observed over about 28% of Mount Observation in the period sampled, but only above 3,000 ft - the lowest measured was 3,000 ft. 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 Mount Observation?
The dominant planning zone in Mount Observation is Rural, though the suburb also includes Conservation.
Does Mount Observation have heritage-listed places?
No heritage-listed places are on record within Mount Observation.
What is the typical lot size in Mount Observation?
Across 25 surveyed parcels in Mount Observation, the median lot size is about 318,140 m².
Is Mount Observation an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Observation scores 994 and sits in decile 6 of 10 nationally and decile 6 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Tooperang | 5.2 km | 0% | 100% |
| Ashbourne | 5.7 km | 0% | 100% |
| Nangkita | 6.7 km | 0% | 100% |
| Mount Magnificent | 6.9 km | 0% | 100% |
| Mcharg Creek | 8.5 km | 0% | 100% |
| Finniss | 8.6 km | 12% | 100% |
| Kuitpo Colony | 8.8 km | 0% | 100% |
| Sandergrove | 9.3 km | 0% | 100% |
| Mosquito Hill | 10.3 km | 0% | 100% |
| Kyeema | 10.7 km | 0% | 100% |