Hilgay flood map & planning overlays
Hilgay's 17% flood share is Southern Grampians' 2nd-highest.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of Hilgay
(Southern Grampians, VIC) - 24.27 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 24 October 2026.
Constraint readout
24.27 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Hilgay'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 Hilgay
The ANEF contour is a published planning forecast and observed overflight is what a sampled tracking feed recorded - neither describes any individual property.
Observed overflight - sampled 4 Sep to 24 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.
How this is measured
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.
Hilgay at a glance
How Hilgay is zoned
Selling in Hilgay? The zoning and planning overlays on this page are the controls a Section 32 vendor statement discloses.
Across its 24.27 km², Hilgay is highly constrained by planning overlays. About 17% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Farming Zone (FZ). The median lot measures about 117,955 m² across 75 parcels.
Who lives in Hilgay
Census 2021 figures published by the ABS for the Hilgay 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 999, and decile 5 within Victoria. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of Southern Grampians, the wider ABS statistical area containing Hilgay. There is no annual population series published at suburb level, so this describes the surrounding area rather than Hilgay itself.
6,728 in 2001 to 6,205 in 2025, down 8%.
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.
Hilgay 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 | Vicmap Planning and Victorian Government spatial services |
| Bushfire-prone mapping | Mapped | Vicmap Planning and Victorian Government spatial services |
| Zoning | Mapped | Vicmap Planning and Victorian Government spatial services |
| Heritage and environment | Mapped where published | Vicmap Planning and Victorian Government spatial services |
| Aircraft noise contours (ANEF) | Not held | Vicmap Planning and Victorian Government spatial services, 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 24 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 Hilgay 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.
See what's in the $9 report →The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Hilgay lot.
Hilgay planning - frequently asked
Is Hilgay flood-prone?
About 17% of Hilgay falls within a mapped flood overlay, against the council-wide suburb average of 3%.
Is Hilgay bushfire-prone?
Around 100% of Hilgay is mapped as bushfire-prone, compared with a Southern Grampians average of 100%.
Is Hilgay under a flight path?
Aircraft were observed over about 3% of Hilgay in the period sampled, but only above 3,000 ft - the lowest measured was 4,500 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 Hilgay?
The dominant planning zone in Hilgay is Farming Zone (FZ), though the suburb also includes Public Conservation and Resource Zone (PCRZ) and Farming Zone (FZ1).
Does Hilgay have heritage-listed places?
Hilgay has 2 heritage-listed places on record.
What is the typical lot size in Hilgay?
Across 75 surveyed parcels in Hilgay, the median lot size is about 117,955 m².
Is Hilgay an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Hilgay scores 999 and sits in decile 6 of 10 nationally and decile 5 within Victoria (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Paschendale Glenelg |
4.8 km | 11% | 100% |
| Coleraine | 4.9 km | 4% | 100% |
| Clover Flat | 6.6 km | 36% | 100% |
| Tahara Bridge Glenelg |
7.1 km | 13% | 100% |
| Henty Glenelg |
9.4 km | 15% | 100% |
| Muntham | 9.5 km | 1% | 100% |
| Tarrenlea | 11.1 km | 5% | 100% |
| Tahara West Glenelg |
12.4 km | Not mapped | 100% |
| Carapook | 13.0 km | Not mapped | 100% |
| Wootong Vale | 14.4 km | Not mapped | 100% |