Floods, fire and getting cut off at Menangle Park

The flood question at Menangle Park is mostly a question about the road, not water in your living room. The NSW SES’s plan for the suburb, endorsed in March 2023, says there is one road in and out, that it cuts at the bridge first, and that the suburb can be isolated — for a short period, which the SES puts at about 24 hours. Separately, Campbelltown’s planning rules require that no new dwelling in the release area sit inside the mapped 1% AEP flood extent. Those are two different tests, and a house that passes the first can still be behind a closed road.

The governing document is the NSW SES Campbelltown City Flood Emergency Sub Plan, endorsed in March 2023, with Volumes 2 and 3 footer-dated November 2023. Volume 3 section 19 is a dedicated Menangle Park response card, and the plan states this is the only part of the Campbelltown LGA exposed to Nepean River riverine flooding.

The gauge, and the trap in it

The plan’s triggers are keyed to the Menangle Bridge gauge (BOM 068216 / AWRC 212904), classified minor 5.2 m, moderate 9.2 m, major 12.2 m. The Bureau of Meteorology’s public Greater Sydney flood map plots a different station — Nepean River at Menangle Weir (568171) — classified minor 2.80 m, moderate 6.50 m, major 9.30 m.

The plan gives two minor-flood figures: its Volume 3 gauge table has 5.2 m and the sector card below it 4.6 m, and nothing we found says which is current. The moderate level of 9.20 m is confirmed independently in a June 2024 SES warning.

What closes, and at what height

Every level below is quoted from the SES plan, which sources them to a Campbelltown City Council document called “Nepean River Flood Extents” that is not published anywhere we could find. The NSW Flood Data Portal lists no flood study for the Menangle Park reach.

Individual Racecourse Avenue and Payten Street addresses are listed with levels from 16.3 m to 22.7 m. That detail is built around the old riverside village and the Paceway, not the new estate.

Can the suburb be cut off?

The sector card is blunt: “Currently there is only one road in and out of the suburb being Menangle Rd. This road will cut first at the bridge and depending on rainfall can cut at Glen Alpine isolating the suburb.”

Two cut points. The southern one is the Nepean bridge, at 7.2 m. The northern one is Menangle Road at Glen Alpine, listed as liable to flooding from Campbelltown Golf Course drainage in a 20% AEP event — roughly one-in-five-year. Isolation needs both. Volume 2’s road-closure table records Menangle Bridge with a consequence of closure of “Isolation”, an alternate route of “M5 or via Camden” and a trigger of 7.23 m; it is the only entry in the LGA table whose stated consequence is outright isolation. The general strategy reads: “Potential for isolation but only for short duration 24hrs so potential resupply / rescue may be required if secondary emergencies occur during this short isolation period.”

Menangle Road is a state road, so closing it is a Transport for NSW decision, made through the Transport Management Centre on 13 77 88. Live closures show on livetraffic.com.au, which also carries a camera on Menangle Road at Menangle Park.

Two other things about the card: it describes a suburb of “around 224” people “not currently undergoing redevelopment”, which Volume 2 of the same plan does not match, and its “At risk properties” cell is blank, so the plan does not give a number of households that could be isolated.

What has actually happened

Peaks recorded at the Menangle Bridge gauge in the plan’s event log: 12.2 m on 10 February 2020; 12.85 m on 23 March 2021; 9.56 m on 7 May 2021; 15.58 m and 15.92 m on 2 and 8 March 2022; and 16.6 m on 3 July 2022, the highest in the log. Campbelltown LGA was covered by disaster declarations for those events (AGRN 960, 1012 and 1025), though a declaration is LGA-wide and not evidence of impact here.

For scale, the Wollondilly Shire flood plan records the worst flooding of the last century at Menangle Bridge as 1978, just above 17.3 m, and puts the approximate 1% AEP level at a gauge height of 18.53 m — a figure it says “should be approached with caution”.

Two recent events are documented directly. On 7 June 2024 the SES issued a Watch and Act for “Menangle and Surrounds” listing Menangle Bridge as closed, the river peaking at about 10.75 metres around 12:30pm. A minor flood warning for the Upper Nepean, updated at 5:07am on 22 August 2025 on Bureau of Meteorology data, recorded the river at Menangle Bridge at 6.58 m and rising, forecast to reach around 8.00 m overnight — above the closure trigger.

Where a house may be built is a different test

The Menangle Park DCP requires that the subdivision pattern ensure no new dwellings sit within the post-development 1% AEP flood extent, and that buildings sit above the Flood Planning Level — 300 mm to 500 mm above the 1% AEP level depending on flow depth. Filling within the floodway is not permitted.

That is a rule about your slab. It says nothing about your driveway to Campbelltown. Check your own lot’s flood notation on the section 10.7 certificate and the NSW Planning Portal Spatial Viewer rather than assuming the estate-wide position applies — land constraints covers how to read those.

How you would find out

The plan says: “Currently when a minor or higher flood warning is issued residents impacted by flooding are contact by telephone by SES and advised of the threat.” It separately asks Council “to consider the Flash flood Warning System as a mitigation measure as SES cannot warn to this community”. Whether one has been funded or installed is not published.

Where the phone numbers come from instead

Volume 1 section 5.4 of the plan lists the methods SES uses to alert an affected community: Emergency Alert, which it describes as an SMS and voice message alerting system; telecommunications including auto dial systems; doorknocking; mobile and fixed public address systems; sirens; variable message signs; community notices; and SES social media and website.

Emergency Alert’s own privacy page says it draws telephone numbers from the Integrated Public Number Database — an industry-wide collection of all listed and unlisted public telephone numbers — through a separate Location Based Number Store that maps numbers to addresses for area-targeted alerting and never receives customer names. Where a message is sent by mobile location rather than by address, the sending organisations have no access to telephone numbers at all. Telcos are required by law to supply that customer information, including the address. Nowhere in the chain does a resident sign up.

Which means the record that decides whether the call or message reaches you is your telco’s, not the SES’s. The Australian Communications and Media Authority, on a page last updated 19 February 2026, says that if the address information your telco holds is old or incorrect the IPND record will be wrong and you may not receive a warning, and that to check the address or request an update after moving you should contact your telco.

What you can do

• Ring each of your phone providers — landline and mobile — and ask them to check and, if needed, correct the service address held against your number in the IPND. A number brought from a previous address is exactly the failure ACMA describes.
• Set a watch zone on your address in the Hazards Near Me NSW app. NSW SES’s During an emergency page tells residents to set one up to receive notifications on changing conditions, and a watch zone is created by searching the address you want watched. This is the only self-service opt-in there is. It delivers push notifications, not a phone call, and it is not a registration with the SES.
• Expect to do nothing for AusAlert. The National Emergency Management Agency says the national cell-broadcast system was technically ready in July 2026 and available for use by October 2026, that it does not collect or store a mobile number or location, that alerts can be targeted to areas as small as 160 metres, that they are not SMS, work without an active SIM and sound even when a phone is on silent or do not disturb, and that anyone who enters an active alert area receives the message. NEMA says it will in future also send automated voice messages to landlines.

The numbers, and what each one is for

The SES also publishes the National Relay Service for people who are deaf or who have a hearing or speech impairment, TIS National for interpreting, and a postal address of PO Box 6126, Wollongong NSW 2500. The Campbelltown Unit that covers Menangle Park is at the corner of Alderney and Townson Avenue, Minto. No unit telephone number is published; residents are directed to 132 500.

Two things that look like a registration and are not. Red Cross Register.Find.Reunite is activated only during a specific emergency, so people can record that they are safe and be matched with family enquiring after them — it is not a warning contact list. And Campbelltown City Council’s Emergency Help Hub carries an “Opt in alerts” sign-in and register box, but it is not a working sign-up: inspected on 30 August 2026, the box was hidden, its sign-in and register panes had no input fields, and none of the 42 visible links or buttons on the page opened it. Use the Hub for its live dashboard of Bureau of Meteorology warnings, road closures, power, transport, water and air quality. Do not treat it as a sign-up.

Where you would go, and how the river behaves

The nominated evacuation centre is Campbelltown Civic Hall, Queen Street, Campbelltown — north along Menangle Road, so reachable only while the northern end is open. The plan identifies no helicopter landing point in the suburb. Menangle Park is not inside the state Hawkesbury-Nepean Valley Flood Emergency Plan area, which runs from Bents Basin to Brooklyn; that plan’s much-publicised evacuation messaging is about a different reach of river.

Flood behaviour, per the SES: 200 mm of rain in 48 hours may cause moderate flooding on the Georges and Nepean systems; floods can begin six to twelve hours after heavy rain starts if the catchment is already saturated; and major floods have traditionally come January to March and May to August. Four Sydney Water dams sit upstream — Cordeaux, Cataract, Nepean and Avon — and their discharge affects flood heights here, though the plan rates the risk of failure low. There are no levees anywhere in the LGA.

Bushfire

Menangle Park is in the NSW RFS Macarthur district, whose fire control centre is at the corner of Alderney Street and Townson Avenue, Minto, on 02 9608 7777 — the same site as the SES Campbelltown Unit. The Bush Fire Information Line is 1800 679 737.

Bushfire prone land is mapped within the precinct at DCP Figure 3.2. The DCP sets a maximum of BAL-29 for general development and BAL-12.5 for special fire protection purpose development, with the level set by an RFS-recognised consultant. Most of the suburb is in the mapping: of 50 points on a grid across the gazetted suburb, checked against the NSW Rural Fire Service’s Bush Fire Prone Land layer on 31 August 2026, 41 were bushfire prone — 32 Vegetation Category 3, the lowest category, six Category 1, the highest, and three Vegetation Buffer. The grid takes in the river corridor and farmland as well as the streets, so it is not a count of residential lots; the coordinates and the result for every point are in docs/research/bfpl-sample-2026-08-31.json. That bites at the lot. Clause 1.19A of the Codes SEPP is the line: land rated BAL-40 or Flame Zone (BAL-FZ) is out of complying development, for every code except the Housing Alterations Code. It is a general requirement in Part 1, not something inside the Greenfield Housing Code. The estate design guidelines permit Colorbond fencing where a lot’s BAL rules timber out. See building approvals and land constraints.

Draft Planning for Bush Fire Protection 2026 was on public exhibition from 6 August to 3 September 2026 and would revise the fire weather areas used in BAL assessment; the RFS says it expects to finalise it in December 2026.

Fire danger ratings here are published for the Greater Sydney fire area, which lists Campbelltown among its councils. Menangle village, across the river, sits in the Illawarra/Shoalhaven fire area and can carry a different rating the same day.

There is no Neighbourhood Safer Place in Menangle Park. The RFS lists 12 in the Campbelltown LGA; the nearest is Oswald Reserve, Oswald Crescent, Rosemeadow. The RFS is clear an NSP is a place of last resort: water, toilets and food may not be available, staff may not be present, and NSPs are not for pets or livestock. It is no substitute for a Bush Fire Survival Plan, which the RFS asks households to write before the season.

Two gaps. There is a volunteer brigade in the suburb — Menangle Park Rural Fire Brigade, 72 Racecourse Avenue, which describes itself on its own Facebook page as part of the RFS Cumberland/Macarthur District — but no page for it could be found on rfs.nsw.gov.au, and which brigade is first-response for a given street here is not published in any brigade directory or boundary dataset we could locate. Ring the Macarthur office to confirm. And the Macarthur Bush Fire Management Committee’s published risk plan is dated 30 June 2012; the RFS’s page describes a five-year review cycle, and no later plan is published.

Before the season

• Check your lot’s flood and bushfire notations on the section 10.7 certificate and the Planning Portal Spatial Viewer
• Confirm your BAL rating, and that any asset protection zone is maintained
• Write a Bush Fire Survival Plan with the household and agree a leave-early trigger
• Ask each phone provider to check the service address held against your number in the Integrated Public Number Database, because that is where Emergency Alert gets its addresses — there is no SES registration to join
• Set a Hazards Near Me NSW watch zone on your address, the only self-service warning opt-in published
• Keep 48 hours of food, water, medication, pet food and baby supplies, double the SES’s isolation estimate
• Save 132 500 (SES flood and storm assistance), 1800 679 737 (bush fire information), 131 003 (Endeavour Energy), 13 77 88 (traffic) and 1300 094 737 (WIRES wildlife rescue)
• Register any life-support equipment with Endeavour Energy — online form or 131 003 — and return the Medical Confirmation Form
• Agree where the household meets if Menangle Road closes with people on both sides
• Never drive, ride or walk into floodwater, and check livetraffic.com.au before leaving

In a life-threatening emergency call Triple Zero. For flood and storm assistance — a tree blocking access, a damaged roof, water entering a property — call the NSW SES on 132 500 and write down the reference number.