Grasstree Hill flood map & planning overlays
A planning-constraint profile of Grasstree Hill
(Clarence, TAS) - 10.23 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
10.23 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Grasstree Hill'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 Grasstree Hill
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 26 Sep 2026
Night movements: observed, lowest 2,500 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.
Grasstree Hill at a glance
How Grasstree Hill is zoned
Buying in Grasstree Hill? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 10.23 km², Grasstree Hill is highly constrained by planning overlays. About 7% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is Rural. The median lot measures about 41,952 m² across 62 parcels.
Who lives in Grasstree Hill
Census 2021 figures published by the ABS for the Grasstree Hill 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 936, and decile 5 within Tasmania. The national average is 1000.
Age profile
Share of Grasstree Hill's 108 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Risdon Vale, the wider ABS statistical area containing Grasstree Hill. There is no annual population series published at suburb level, so this describes the surrounding area rather than Grasstree Hill itself.
2,953 in 2001 to 3,799 in 2025, up 29%.
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.
Grasstree Hill 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 Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Bushfire-prone mapping | Mapped | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Zoning | Mapped | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Heritage and environment | Mapped where published | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Aircraft noise contours (ANEF) | Not held | the Tasmanian Planning Scheme and the LIST (Land Tasmania), 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 Grasstree Hill 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 12% of Grasstree Hill. 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 here: a Flood Model Report is available for about 50 Grasstree Hill addresses (+$9 with the planning report).
See what's in the $9 report →Grasstree Hill planning - frequently asked
Is Grasstree Hill flood-prone?
About 7% of Grasstree Hill falls within a mapped flood overlay, against the council-wide suburb average of 17%. Modelled flood depth, velocity and flood level are held for about 50 Grasstree Hill addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Is Grasstree Hill bushfire-prone?
Around 100% of Grasstree Hill is mapped as bushfire-prone, compared with a Clarence average of 66%.
Is Grasstree Hill under a flight path?
Aircraft were observed below 3,000 ft over about 12% of Grasstree Hill, and over about 14% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 26 Sep 2026). The lowest measured aircraft was at 1,000 ft, with an average of 2,500 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 Grasstree Hill?
The dominant planning zone in Grasstree Hill is Rural, though the suburb also includes Landscape Conservation and Utilities.
Does Grasstree Hill have heritage-listed places?
Grasstree Hill has 1 heritage-listed place on record.
What is the typical lot size in Grasstree Hill?
Across 62 surveyed parcels in Grasstree Hill, the median lot size is about 41,952 m².
What is the population of Grasstree Hill?
At the 2021 Census Grasstree Hill had 108 usual residents, with a median age of 45 and an average household size of 2.3 people. The wider Risdon Vale statistical area, which contains Grasstree Hill, went from 2,953 people in 2001 to 3,799 in 2025, up 29%.
Is Grasstree Hill an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Grasstree Hill scores 936 and sits in decile 3 of 10 nationally and decile 5 within Tasmania (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Grasstree Hill?
Median household income in Grasstree Hill was $1,125 a week at the 2021 Census, against $1,723 for the typical suburb in Clarence. Median rent was $290 a week and the median mortgage repayment $1,529 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Dulcot | 2.6 km | 5% | 100% |
| Risdon Vale | 2.7 km | 11% | 94% |
| Risdon | 4.2 km | 16% | 100% |
| Geilston Bay | 5.3 km | 12% | 87% |
| Otago | 6.3 km | 13% | 87% |
| Richmond | 6.5 km | 12% | 99% |
| Lindisfarne | 6.5 km | 11% | 63% |
| Cambridge | 6.7 km | 15% | 79% |
| Old Beach Brighton |
7.1 km | 7% | 94% |
| Dowsing Point Glenorchy |
7.3 km | 12% | 0% |