Cowper flood map & planning overlays
A planning-constraint profile of Cowper
(Clarence Valley, NSW) - 13.6 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
13.6 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Cowper's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Cowper
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: 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.
Cowper at a glance
How Cowper is zoned
Buying in Cowper? 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 13.6 km², Cowper is highly constrained by planning overlays. About 100% of the suburb sits within a mapped flood overlay, and 93% is flagged bushfire-prone. There are 6 heritage-listed sites on record, and the dominant land-use zone is Primary Production. The median lot measures about 6,914 m² across 193 parcels.
Who lives in Cowper
Census 2021 figures published by the ABS for the Cowper 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 900, and decile 1 within New South Wales. The national average is 1000.
Age profile
Share of Cowper's 88 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Grafton Surrounds, the wider ABS statistical area containing Cowper. There is no annual population series published at suburb level, so this describes the surrounding area rather than Cowper 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.
Cowper 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 Cowper 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 Cowper lot.
See what's in the $9 report →Cowper planning - frequently asked
Is Cowper flood-prone?
About 100% of Cowper falls within a mapped flood overlay, against the council-wide suburb average of 24%.
Is Cowper bushfire-prone?
Around 93% of Cowper is mapped as bushfire-prone, compared with a Clarence Valley average of 94%.
Is Cowper under a flight path?
No aircraft were observed over Cowper 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 Cowper?
The dominant planning zone in Cowper is Primary Production, though the suburb also includes Recreational Waterways and Infrastructure.
Does Cowper have heritage-listed places?
Cowper has 6 heritage-listed places on record.
What is the typical lot size in Cowper?
Across 193 surveyed parcels in Cowper, the median lot size is about 6,914 m².
Does Cowper have a train station?
There is no train station inside Cowper itself. The suburb is served by 8 bus stops.
What is the population of Cowper?
At the 2021 Census Cowper had 88 usual residents, with a median age of 48 and an average household size of 2.4 people. The wider Grafton Surrounds statistical area, which contains Cowper, went from 14,917 people in 2001 to 18,099 in 2025, up 21%.
Is Cowper an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Cowper scores 900 and sits in decile 2 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 Cowper?
Median household income in Cowper was $1,300 a week at the 2021 Census, against $1,187 for the typical suburb in Clarence Valley. Median rent was $300 a week and the median mortgage repayment $1,149 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Brushgrove | 2.5 km | 100% | 58% |
| Coldstream | 3.6 km | 99% | 100% |
| Calliope | 3.9 km | 100% | 100% |
| Lower Southgate | 4.9 km | 63% | 96% |
| Southgate | 6.9 km | 60% | 95% |
| Gilletts Ridge | 7.0 km | 90% | 100% |
| Ulmarra | 7.1 km | 100% | 94% |
| Tyndale | 8.7 km | 61% | 99% |
| Kyarran | 9.2 km | 7% | 100% |
| Woodford Island | 9.7 km | 80% | 91% |