Mount Crosby flood map & planning overlays
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 19 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
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.
Nearby suburbs, nearest first
How common is mapped flood risk across Mount Crosby properties?
Overlay percentages say how much land is constrained; these figures say how many properties are actually touched in a suburb-wide analysis of 778 Mount Crosby properties. No individual property result is identified on this page.
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.
Mount Crosby flood history and overland flow
These are suburb-wide totals across 778 analysed properties. They show how common each mapped category is across Mount Crosby; 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: 38
- February 2022: 33
Mapped overland flow
477 analysed properties carry a mapped overland-flow category.
- Low: 65
- Medium: 141
- High: 262
- 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.
Mount Crosby at a glance
Schools in and near Mount Crosby
Public school-location data shows availability across the suburb. These figures do not rate schools and do not assign a particular 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 30% 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 5,139 m² across 720 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 20 September 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 |
| 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 19 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 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.
Published flood models are held here: a Flood Model Report is available for about 770 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 (+$9 with the planning report).
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Mount Crosby lot.
See what's in the $9 report →Mount Crosby planning - frequently asked
Is Mount Crosby flood-prone?
About 30% of Mount Crosby falls within a mapped flood overlay, against the council-wide suburb average of 40%. Across the suburb, 9% of the 778 properties we analysed carry some level of mapped flood risk, including 25 rated high risk or historically affected.
Is Mount Crosby bushfire-prone?
Around 92% of Mount Crosby is mapped as bushfire-prone, compared with a Brisbane City average of 27%.
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 720 surveyed parcels in Mount Crosby, the median lot size is about 5,139 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 | 29% | 80% |
| Chuwar | 2.4 km | 48% | 89% |
| Karana Downs | 3.4 km | 43% | 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% |