Trevallyn flood map & planning overlays
A planning-constraint profile of Trevallyn
(West Tamar, TAS) - 9.85 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
9.85 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Trevallyn'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 Trevallyn
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 3 Oct 2026
typical observed square 7 a day
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.
Trevallyn at a glance
How Trevallyn is zoned
Buying in Trevallyn? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 9.85 km², Trevallyn is highly constrained by planning overlays. About 9% of the suburb sits within a mapped flood overlay, and 77% is flagged bushfire-prone. There are 30 heritage-listed sites on record, and the dominant land-use zone is Environmental Management. The median lot measures about 760 m² across 2,408 parcels.
Who lives in Trevallyn
Census 2021 figures published by the ABS for the Trevallyn 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 1015, and decile 10 within Tasmania. The national average is 1000.
Age profile
Share of Trevallyn's 4,826 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Trevallyn, the wider ABS statistical area containing Trevallyn. There is no annual population series published at suburb level, so this describes the surrounding area rather than Trevallyn itself.
4,697 in 2001 to 4,874 in 2025, up 4%.
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.
Trevallyn 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 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 Trevallyn 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 26% of Trevallyn. 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 2,200 Trevallyn addresses (+$9 with the planning report).
See what's in the $9 report →Trevallyn planning - frequently asked
Is Trevallyn flood-prone?
About 9% of Trevallyn falls within a mapped flood overlay, against the council-wide suburb average of 9%. Modelled flood depth, velocity and flood level are held for about 2,200 Trevallyn addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Is Trevallyn bushfire-prone?
Around 77% of Trevallyn is mapped as bushfire-prone, compared with a West Tamar average of 95%.
Is Trevallyn under a flight path?
Aircraft were observed below 3,000 ft over about 26% of Trevallyn, and over about 40% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 1,000 ft, with an average of 3,000 ft. At the busiest point in the suburb about 21 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 Trevallyn?
The dominant planning zone in Trevallyn is Environmental Management, though the suburb also includes General Residential and Open Space.
Does Trevallyn have heritage-listed places?
Trevallyn has 30 heritage-listed places on record.
What is the typical lot size in Trevallyn?
Across 2,408 surveyed parcels in Trevallyn, the median lot size is about 760 m².
What is the population of Trevallyn?
At the 2021 Census Trevallyn had 4,826 usual residents, with a median age of 40 and an average household size of 2.4 people. The wider Trevallyn statistical area, which contains Trevallyn, went from 4,697 people in 2001 to 4,874 in 2025, up 4%.
Is Trevallyn an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Trevallyn scores 1015 and sits in decile 7 of 10 nationally and decile 10 within Tasmania (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Trevallyn?
Median household income in Trevallyn was $1,614 a week at the 2021 Census, against $1,293 for the typical suburb in West Tamar. Median rent was $300 a week and the median mortgage repayment $1,387 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| West Launceston Launceston |
2.4 km | 6% | 63% |
| Blackstone Heights Meander Valley |
2.7 km | 12% | 100% |
| Summerhill Launceston |
3.1 km | 7% | 48% |
| Launceston Launceston |
3.4 km | 59% | 32% |
| Invermay Launceston |
3.4 km | 61% | 10% |
| East Launceston Launceston |
4.1 km | 4% | 0% |
| South Launceston Launceston |
4.2 km | 10% | 14% |
| Prospect Vale Meander Valley |
4.7 km | 4% | 70% |
| Riverside | 5.2 km | 13% | 89% |
| Newstead Launceston |
5.2 km | 38% | 29% |