Twelve Mile Creek flood map & planning overlays
A planning-constraint profile of Twelve Mile Creek
(Port Stephens, NSW) - 22.73 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
22.73 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Twelve Mile Creek'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 Twelve Mile Creek
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
Night movements: observed, lowest 6,000 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.
Twelve Mile Creek at a glance
How Twelve Mile Creek is zoned
Buying in Twelve Mile Creek? 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 22.73 km², Twelve Mile Creek is highly constrained by planning overlays. About 34% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Forestry. The median lot measures about 134,138 m² across 56 parcels.
Who lives in Twelve Mile Creek
Census 2021 figures published by the ABS for the Twelve Mile Creek 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 854, and decile 1 within New South Wales. The national average is 1000.
Age profile
Share of Twelve Mile Creek's 159 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Williamtown - Medowie - Karuah, the wider ABS statistical area containing Twelve Mile Creek. There is no annual population series published at suburb level, so this describes the surrounding area rather than Twelve Mile Creek itself.
10,830 in 2001 to 17,178 in 2025, up 59%.
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.
Twelve Mile Creek 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 Twelve Mile Creek 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 10% of Twelve Mile Creek. 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 Twelve Mile Creek lot.
See what's in the $9 report →Twelve Mile Creek planning - frequently asked
Is Twelve Mile Creek flood-prone?
About 34% of Twelve Mile Creek falls within a mapped flood overlay, against the council-wide suburb average of 45%.
Is Twelve Mile Creek bushfire-prone?
Around 100% of Twelve Mile Creek is mapped as bushfire-prone, compared with a Port Stephens average of 82%.
Is Twelve Mile Creek under a flight path?
Aircraft were observed below 3,000 ft over about 10% of Twelve Mile Creek, and over about 37% 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 5,000 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 Twelve Mile Creek?
The dominant planning zone in Twelve Mile Creek is Forestry, though the suburb also includes Rural Landscape and National Parks and Nature Reserves.
Does Twelve Mile Creek have heritage-listed places?
No heritage-listed places are on record within Twelve Mile Creek.
What is the typical lot size in Twelve Mile Creek?
Across 56 surveyed parcels in Twelve Mile Creek, the median lot size is about 134,138 m².
Does Twelve Mile Creek have a train station?
There is no train station inside Twelve Mile Creek itself. The suburb is served by 22 bus stops.
What is the population of Twelve Mile Creek?
At the 2021 Census Twelve Mile Creek had 159 usual residents, with a median age of 49 and an average household size of 1.9 people. The wider Williamtown - Medowie - Karuah statistical area, which contains Twelve Mile Creek, went from 10,830 people in 2001 to 17,178 in 2025, up 59%.
Is Twelve Mile Creek an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Twelve Mile Creek scores 854 and sits in decile 1 of 10 nationally and decile 1 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Twelve Mile Creek?
Median household income in Twelve Mile Creek was $933 a week at the 2021 Census, against $1,421 for the typical suburb in Port Stephens. Median rent was $273 a week and the median mortgage repayment $1,582 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Balickera | 5.2 km | 22% | 99% |
| Karuah | 7.9 km | 18% | 89% |
| Limeburners Creek Mid-Coast |
8.6 km | Not mapped | 98% |
| Swan Bay | 9.5 km | 51% | 99% |
| Ferodale | 9.9 km | 50% | 74% |
| Eagleton | 10.7 km | 32% | 100% |
| East Seaham | 10.7 km | 41% | 99% |
| Medowie | 11.5 km | 39% | 79% |
| Clarence Town Dungog |
11.6 km | Not mapped | 99% |
| Glen Martin Dungog |
11.9 km | Not mapped | 100% |