Blaxlands Ridge flood map & planning overlays
A planning-constraint profile of Blaxlands Ridge
(Hawkesbury, NSW) - 42.42 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
42.42 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Blaxlands Ridge'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 Blaxlands Ridge
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 2 Oct 2026
typical observed square 1 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.
Blaxlands Ridge at a glance
How Blaxlands Ridge is zoned
Buying in Blaxlands Ridge? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 42.42 km², Blaxlands Ridge is highly constrained by planning overlays. About 5% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Primary Production. The median lot measures about 39,747 m² across 264 parcels.
Who lives in Blaxlands Ridge
Census 2021 figures published by the ABS for the Blaxlands Ridge 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 1053, and decile 8 within New South Wales. The national average is 1000.
Age profile
Share of Blaxlands Ridge's 589 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Kurrajong Heights - Ebenezer, the wider ABS statistical area containing Blaxlands Ridge. There is no annual population series published at suburb level, so this describes the surrounding area rather than Blaxlands Ridge itself.
21,001 in 2001 to 22,515 in 2025, up 7%.
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.
Blaxlands Ridge 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 | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Aircraft noise contours (ANEF) | Not held | NSW Government spatial services, NSW ePlanning and published council flood studies, 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 Blaxlands Ridge 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 45% of Blaxlands Ridge. 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 over parts of Blaxlands Ridge. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$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 Blaxlands Ridge lot.
See what's in the $9 report →Blaxlands Ridge planning - frequently asked
Is Blaxlands Ridge flood-prone?
About 5% of Blaxlands Ridge falls within a mapped flood overlay, against the council-wide suburb average of 24%. Published flood models are held over parts of Blaxlands Ridge; the free check on the Flood Model Report page says whether one reaches a given address.
Is Blaxlands Ridge bushfire-prone?
Around 100% of Blaxlands Ridge is mapped as bushfire-prone, compared with a Hawkesbury average of 84%.
Is Blaxlands Ridge under a flight path?
Aircraft were observed below 3,000 ft over about 45% of Blaxlands Ridge, and over about 69% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 3,500 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 Blaxlands Ridge?
The dominant planning zone in Blaxlands Ridge is Primary Production, though the suburb also includes National Parks and Nature Reserves and Primary Production Small Lots.
Does Blaxlands Ridge have heritage-listed places?
Blaxlands Ridge has 2 heritage-listed places on record.
What is the typical lot size in Blaxlands Ridge?
Across 264 surveyed parcels in Blaxlands Ridge, the median lot size is about 39,747 m². There are also 3 registered easements mapped in the suburb.
Does Blaxlands Ridge have a train station?
There is no train station inside Blaxlands Ridge itself. The suburb is served by 6 bus stops.
What is the population of Blaxlands Ridge?
At the 2021 Census Blaxlands Ridge had 589 usual residents, with a median age of 39 and an average household size of 3.4 people. The wider Kurrajong Heights - Ebenezer statistical area, which contains Blaxlands Ridge, went from 21,001 people in 2001 to 22,515 in 2025, up 7%.
Is Blaxlands Ridge an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Blaxlands Ridge scores 1053 and sits in decile 9 of 10 nationally and decile 8 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Blaxlands Ridge?
Median household income in Blaxlands Ridge was $2,764 a week at the 2021 Census, against $2,160 for the typical suburb in Hawkesbury. Median rent was $470 a week and the median mortgage repayment $2,600 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| East Kurrajong | 3.9 km | 9% | 100% |
| Colo | 6.0 km | 0% | 100% |
| Central Colo | 6.6 km | 0% | 100% |
| Glossodia | 6.9 km | 3% | 84% |
| Sackville | 7.9 km | 55% | 93% |
| Cumberland Reach | 8.1 km | 55% | 91% |
| Lower Portland The Hills Shire |
8.6 km | 20% | 97% |
| Ebenezer | 8.6 km | 41% | 92% |
| Sackville North The Hills Shire |
10.1 km | 32% | 92% |
| Tennyson | 10.1 km | 0% | 98% |