Mount Crosby flood map & planning overlays
A 17.7% median lot slope, 5th-steepest in Brisbane City, and 91.6% bushfire-mapped. Hills and bush.
Things you won't regret: spending $9 to know the lot before you commit.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of Mount Crosby
(Brisbane City, QLD) - 15.28 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 7 November 2026.
Constraint readout
15.28 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount Crosby'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
How common is mapped flood risk across Mount Crosby properties?
Counts of properties, not share of land, across 778 analysed Mount Crosby properties; no individual property result is identified.
Lot-level readout
Flood-risk rating across all 778 properties
From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Mount Crosby.
Has Mount Crosby flooded? Flood history and overland flow
Yes. Recorded flood mapping reaches into Mount Crosby: 48 of the 778 properties we analysed (6.2%) sit at least partly inside a mapped historical flood extent (January 2011: 42, Historic Flood 1974: 36, February 2022: 31). The free address check says whether a given lot is inside one.
Suburb-wide totals across 778 analysed properties; they do not identify or describe any individual property.
Recorded historical flood mapping
48 analysed properties intersect at least one mapped historical event extent.
- January 2011: 42
- Historic Flood 1974: 36
- February 2022: 31
Mapped overland flow
476 analysed properties carry a mapped overland-flow category.
- Low: 66
- Medium: 141
- High: 260
- Affected: 9
Source: Brisbane City Council flood mapping, aggregated by LayeredGeo. Categories are only shown where at least five analysed properties share them. An address-level check is still required to determine whether a particular lot is mapped.
Aircraft noise and flight paths over Mount Crosby
The ANEF contour is a published planning forecast and observed overflight is what a sampled tracking feed recorded - neither describes any individual property.
Observed overflight - sampled 4 Sep to 7 Nov 2026
typical observed square 1 a day
Night movements: observed, lowest 1,500 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.
How this is measured
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 Crosby at a glance
Schools in and near Mount Crosby
Public school-location data shows availability across the suburb; it does not rate schools or assign any individual address to a catchment.
Inside the suburb boundary
0 schools providing primary years and 0 providing secondary years. A combined school may be counted in both teaching levels.
Nearest school availability
Primary: 0.02 km from the suburb boundary
Secondary: 5.76 km from the suburb boundary
Source: Queensland Government school geographic information. Catchment boundaries can divide a suburb and change over time; use the official catchment finder for a specific address.
How Mount Crosby is zoned
Selling in Mount Crosby? The lot-level zone is the zoning Part 3 of Queensland's Form 2 seller disclosure statement asks for - see our Form 2 planning data guide.
Across its 15.28 km², Mount Crosby is highly constrained by planning overlays. About 24% of the suburb sits within a mapped flood overlay, and 92% is flagged bushfire-prone. There are 18 heritage-listed sites on record, and the dominant land-use zone is Special purpose (Utility services). The terrain is hilly, and the median lot measures about 5,137 m² across 723 parcels.
Recent development applications in Mount Crosby
Applications are counted across the whole gazetted suburb from the public Brisbane City Council register. No application address or individual property is published here.
Submitted in the past 12 months
The exact total and latest date are suppressed for privacy.
Counts depend on applications that the council publishes and that can be assigned to a suburb. Categories can overlap when one application covers several types. Totals below five and their latest dates are suppressed. Register last synchronised 8 November 2026. Check the official council register.
Who lives in Mount Crosby
Census 2021 figures published by the ABS for the Mount Crosby 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 1109, and decile 10 within Queensland. The national average is 1000.
Age profile
Share of Mount Crosby's 1,860 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Karana Downs, the wider ABS statistical area containing Mount Crosby. There is no annual population series published at suburb level, so this describes the surrounding area rather than Mount Crosby itself.
5,096 in 2001 to 6,261 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.
Mount Crosby property market snapshot
Queensland Government publishes this as a SA2 market series for Karana Downs, the wider statistical area containing Mount Crosby. It is not a valuation and is not specific to this suburb or any individual property.
House sales
Median sale price from 96 sales over 12 months to March 2026.
Source: Queensland Government Statistician's Office (QGSO). View the source profile. The same SA2 figure can appear on several suburb pages within that statistical area.
Mount Crosby 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 relevant council planning scheme and Queensland Government spatial data |
| Bushfire-prone mapping | Mapped | the relevant council planning scheme and Queensland Government spatial data |
| Zoning | Mapped | the relevant council planning scheme and Queensland Government spatial data |
| Heritage and environment | Mapped where published | the relevant council planning scheme and Queensland Government spatial data |
| Aircraft noise contours (ANEF) | Not held | the relevant council planning scheme and Queensland Government spatial data, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
| School availability | Available | Queensland Government |
| Market statistics | Available at SA2 level | Queensland Government Statistician's Office (QGSO) |
| Development applications | Available as suburb totals | Brisbane City Council |
Profile last materially updated 7 November 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 Crosby 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.
See what's in the $9 report →Aircraft have been seen below 3,000 ft over about 84% of Mount Crosby. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Published flood models are held here: a Flood Model Report is available for about 780 Mount Crosby addresses (+$9 with the planning report).
The Terrain Report shows the fall of the block - contours, cross sections and a 3D model of the lot to spin round in your browser (+$9 with the planning report).
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Mount Crosby lot.
Mount Crosby planning - frequently asked
Is Mount Crosby flood-prone?
About 24% of Mount Crosby falls within a mapped flood overlay, against the council-wide suburb average of 31%. Across the suburb, 9% of the 778 properties we analysed carry some level of mapped flood risk, including 23 rated high risk or historically affected. Modelled flood depth, velocity and flood level are held for about 780 Mount Crosby addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Has Mount Crosby flooded?
Yes. Recorded flood mapping reaches into Mount Crosby: 48 of the 778 properties we analysed (6.2%) sit at least partly inside a mapped historical flood extent (January 2011: 42, Historic Flood 1974: 36, February 2022: 31). The free address check says whether a given lot is inside one.
Is Mount Crosby bushfire-prone?
Around 92% of Mount Crosby is mapped as bushfire-prone, compared with a Brisbane City average of 27%.
Is Mount Crosby under a flight path?
Aircraft were observed below 3,000 ft over about 84% of Mount Crosby, and over about 96% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 7 Nov 2026). The lowest measured aircraft was at 500 ft, with an average of 3,000 ft. At the busiest point in the suburb about 3 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 Mount Crosby?
The dominant planning zone in Mount Crosby is Special purpose (Utility services), though the suburb also includes Rural residential and Conservation (Local).
Does Mount Crosby have heritage-listed places?
Mount Crosby has 18 heritage-listed places on record.
Is Mount Crosby hilly or flat?
Mount Crosby is hilly: the median ground slope is about 18%, and 65% of measured points sit on grades of 15% or steeper. Ground level runs from roughly 30 m to 107 m AHD across the suburb.
What is the typical lot size in Mount Crosby?
Across 723 surveyed parcels in Mount Crosby, the median lot size is about 5,137 m². There are also 246 registered easements mapped in the suburb.
What is the population of Mount Crosby?
At the 2021 Census Mount Crosby had 1,860 usual residents, with a median age of 42 and an average household size of 3.1 people. The wider Karana Downs statistical area, which contains Mount Crosby, went from 5,096 people in 2001 to 6,261 in 2025, up 23%.
Is Mount Crosby an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Crosby scores 1109 and sits in decile 10 of 10 nationally and decile 10 within Queensland (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Mount Crosby?
Median household income in Mount Crosby was $2,993 a week at the 2021 Census, against $2,122 for the typical suburb in Brisbane City. Median rent was $478 a week and the median mortgage repayment $2,095 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Kholo | 2.1 km | 22% | 80% |
| Chuwar | 2.4 km | 39% | 89% |
| Karana Downs | 3.4 km | 36% | 69% |
| Chuwar Ipswich City |
3.7 km | 32% | 77% |
| Karalee Ipswich City |
4.5 km | 83% | 52% |
| North Tivoli Ipswich City |
5.3 km | 94% | 85% |
| Tivoli Ipswich City |
6.2 km | 72% | 76% |
| Barellan Point Ipswich City |
6.8 km | 91% | 40% |
| Muirlea Ipswich City |
6.8 km | 36% | 97% |
| North Booval Ipswich City |
7.2 km | 100% | 25% |