Eighteen Mile flood map & planning overlays
A planning-constraint profile of Eighteen Mile
(Clarence Valley, NSW) - 70.93 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
70.93 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Eighteen Mile's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Eighteen Mile
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 to
Night movements: observed, lowest 9,000 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.
Eighteen Mile at a glance
How Eighteen Mile is zoned
Buying in Eighteen Mile? 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 70.93 km², Eighteen Mile 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. There are 17 heritage-listed sites on record, and the dominant land-use zone is Rural Landscape. The median lot measures about 381,533 m² across 53 parcels.
Who lives in Eighteen Mile
Census 2021 figures published by the ABS for the Eighteen Mile 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 952, and decile 3 within New South Wales. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of Grafton Surrounds, the wider ABS statistical area containing Eighteen Mile. There is no annual population series published at suburb level, so this describes the surrounding area rather than Eighteen Mile itself.
14,917 in 2001 to 18,099 in 2025, up 21%.
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.
Eighteen Mile 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 26 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 Eighteen Mile 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.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Eighteen Mile lot.
See what's in the $9 report →Eighteen Mile planning - frequently asked
Is Eighteen Mile flood-prone?
Flood mapping covers Eighteen Mile and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 24%).
Is Eighteen Mile bushfire-prone?
Around 100% of Eighteen Mile is mapped as bushfire-prone, compared with a Clarence Valley average of 94%.
Is Eighteen Mile under a flight path?
No aircraft were observed over Eighteen Mile in the period sampled (recent weeks to now). Sampling is intermittent, so that is a floor rather than proof that none fly over. 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 Eighteen Mile?
The dominant planning zone in Eighteen Mile is Rural Landscape, though the suburb also includes Natural Waterways.
Does Eighteen Mile have heritage-listed places?
Eighteen Mile has 17 heritage-listed places on record.
What is the typical lot size in Eighteen Mile?
Across 53 surveyed parcels in Eighteen Mile, the median lot size is about 381,533 m². There are also 1 registered easements mapped in the suburb.
Is Eighteen Mile an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Eighteen Mile scores 952 and sits in decile 4 of 10 nationally and decile 3 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Dumbudgery | 6.7 km | 0% | 100% |
| Baryulgil | 6.8 km | 0% | 100% |
| Carnham | 7.7 km | 0% | 100% |
| Collum Collum | 11.1 km | 0% | 100% |
| Malabugilmah | 11.9 km | 0% | 100% |
| Lionsville | 13.8 km | 0% | 100% |
| Fine Flower | 13.9 km | 0% | 100% |
| Upper Fine Flower | 14.3 km | 0% | 100% |
| Deep Creek | 15.2 km | 0% | 100% |
| Coombadjha | 16.5 km | 0% | 100% |