Marnoo flood map & planning overlays
Marnoo, median 52, holds 8 ha farms with 34.6% flood mapping.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of Marnoo
(Northern Grampians, VIC) - 117.52 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 25 October 2026.
Constraint readout
117.52 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Marnoo's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Marnoo
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 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.
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.
Marnoo at a glance
How Marnoo is zoned
Selling in Marnoo? The zoning and planning overlays on this page are the controls a Section 32 vendor statement discloses.
Across its 117.52 km², Marnoo is highly constrained by planning overlays. About 35% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Farming Zone (FZ). The median lot measures about 83,092 m² across 475 parcels.
Who lives in Marnoo
Census 2021 figures published by the ABS for the Marnoo 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 1030, and decile 8 within Victoria. The national average is 1000.
Age profile
Share of Marnoo's 99 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of St Arnaud, the wider ABS statistical area containing Marnoo. There is no annual population series published at suburb level, so this describes the surrounding area rather than Marnoo itself.
4,075 in 2001 to 3,394 in 2025, down 17%.
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.
Marnoo 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 25 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 Marnoo 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 →Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Marnoo lot.
Marnoo planning - frequently asked
Is Marnoo flood-prone?
About 35% of Marnoo falls within a mapped flood overlay, against the council-wide suburb average of 27%.
Is Marnoo bushfire-prone?
Around 100% of Marnoo is mapped as bushfire-prone, compared with a Northern Grampians average of 100%.
Is Marnoo under a flight path?
No aircraft were observed over Marnoo 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 Marnoo?
The dominant planning zone in Marnoo is Farming Zone (FZ), though the suburb also includes Transport Zone (TRZ2) and Public Conservation and Resource Zone (PCRZ).
Does Marnoo have heritage-listed places?
No heritage-listed places are on record within Marnoo.
What is the typical lot size in Marnoo?
Across 475 surveyed parcels in Marnoo, the median lot size is about 83,092 m². There are also 39 registered easements mapped in the suburb.
Does Marnoo have a train station?
There is no train station inside Marnoo itself. The suburb is served by 4 bus stops.
What is the population of Marnoo?
At the 2021 Census Marnoo had 99 usual residents, with a median age of 52 and an average household size of 2.1 people. The wider St Arnaud statistical area, which contains Marnoo, went from 4,075 people in 2001 to 3,394 in 2025, down 17%.
Is Marnoo an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Marnoo scores 1030 and sits in decile 8 of 10 nationally and decile 8 within Victoria (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Marnoo?
Median household income in Marnoo was $900 a week at the 2021 Census, against $1,296 for the typical suburb in Northern Grampians. Median rent was $130 a week and the median mortgage repayment $322 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Marnoo East | 7.0 km | 68% | 100% |
| Wallaloo | 7.4 km | 15% | 100% |
| Grays Bridge | 8.1 km | 100% | 100% |
| Bolangum | 9.2 km | 9% | 100% |
| Gre Gre South | 10.4 km | 40% | 100% |
| Marnoo West | 10.5 km | 49% | 100% |
| York Plains | 11.4 km | 98% | 100% |
| Kanya | 12.1 km | 15% | 100% |
| Banyena | 12.6 km | 86% | 100% |
| Wallaloo East | 12.9 km | 17% | 100% |