Mount William flood map & planning overlays
A planning-constraint profile of Mount William
(Break O'Day, TAS) - 124.57 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
124.57 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Mount William's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Mount William
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
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.
Mount William at a glance
How Mount William is zoned
Buying in Mount William? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 124.57 km², Mount William is highly constrained by planning overlays. About 13% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Environmental Management. The median lot measures about 18,847,918 m² across 5 parcels.
Mount William 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 | Not 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 Mount William 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.
Published flood models are held over parts of Mount William. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.
See what's in the $9 report →Mount William planning - frequently asked
Is Mount William flood-prone?
About 13% of Mount William falls within a mapped flood overlay, against the council-wide suburb average of 13%. Published flood models are held over parts of Mount William; the free check on the Flood Model Report page says whether one reaches a given address.
Is Mount William bushfire-prone?
Around 100% of Mount William is mapped as bushfire-prone, compared with a Break O'Day average of 99%.
Is Mount William under a flight path?
No aircraft were observed over Mount William in the period sampled (4 Sep 2026 to 3 Oct 2026). 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 Mount William?
The dominant planning zone in Mount William is Environmental Management, though the suburb also includes Agriculture and Utilities.
Does Mount William have heritage-listed places?
No heritage-listed places are on record within Mount William.
What is the typical lot size in Mount William?
Across 5 surveyed parcels in Mount William, the median lot size is about 18,847,918 m².
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Eddystone | 9.5 km | 21% | 100% |
| Musselroe Bay Dorset |
10.8 km | 21% | 100% |
| Ansons Bay | 16.8 km | 9% | 100% |
| Gladstone Dorset |
17.8 km | 11% | 100% |
| Rushy Lagoon Dorset |
21.2 km | 19% | 100% |
| South Mount Cameron Dorset |
25.3 km | 12% | 100% |
| The Gardens | 25.3 km | 14% | 99% |
| Cape Portland Dorset |
25.6 km | 29% | 100% |
| Boobyalla Dorset |
29.1 km | 29% | 100% |
| Pioneer Dorset |
30.9 km | 11% | 100% |