Zone 6 Water Trading Explained: Vic Murray (Above Choke)

Zone 6 is the Victorian Murray above the Barmah Choke. It covers the Murray River system from Hume Dam downstream to the Barmah-Millewa Forest narrows — the Yarrawonga, Cobram and Tocumwal reach and the surrounding Murray Valley irrigation districts. The zone trades approximately 100-200 GL of temporary allocation per year and is the second most active Victorian trading zone after Zone 1A.

The system and its storages

Zone 6 draws from the Murray system — primarily Hume Dam (3,005 GL) and Dartmouth Dam (3,856 GL). Combined, these storages total nearly 6,900 GL — roughly double Eildon's capacity. This larger storage buffer is why Murray HRWS allocations typically reach 100% earlier than Goulburn HRWS.

In WY2025/26, Murray HRWS hit 100% by November 17. Goulburn HRWS finished the season at 81%. The Murray system simply has more water to draw on when inflows are moderate.

Entering WY2026/27, Hume sits at 22% (663 GL — critically low) while Dartmouth provides buffer at 65%. Both are well below last year. Dartmouth will be drawn upon to supplement Hume — it is the backstop that keeps Murray allocations above Goulburn allocations in most seasons.

Zone 6 falls under Victorian water law (Water Act 1989). All trades are processed through the Victorian Water Register (VWR), managed by DEECA. NVRM announces allocations fortnightly during the irrigation season.

The Barmah Choke — why it defines this zone

The Barmah Choke is the narrow reach of the Murray between roughly Yarrawonga and Barmah where channel capacity drops to about 7,000 ML per day — and it is declining as sand accumulates in the channel. The river passes through the Barmah-Millewa Forest — Ramsar-listed wetland — and narrows dramatically.

Zone 6 sits above the Choke. This is its strategic advantage. Water held in Zone 6 can be delivered locally without needing to pass through the bottleneck. When the Choke is running at capacity during peak summer demand, Zone 6 irrigators are unaffected for local delivery.

For traders, the Choke is also a trade boundary. Allocation trade from Zone 6 down into Zone 7 is restricted — effectively closed — because it would add delivery through the Choke. Trade in the other direction, from Zone 7 up into Zone 6, is open. This is why below-Choke water carries the structural scarcity premium: in most seasons Zone 7 trades above Zone 6, because Zone 7 buyers cannot draw on the above-Choke pool.

A common point of confusion: Torrumbarry, Nyah/Tresco, Swan Hill, Robinvale, Red Cliffs, Merbein and FMIT (First Mildura Irrigation Trust) all sit downstream of Barmah. They are Zone 7 districts, not Zone 6. Zone 6 proper is the Yarrawonga-Cobram-Tocumwal reach.

Who trades here

Dairy is the backbone of demand along the Zone 6 reach — the Murray Valley irrigation districts around Cobram, Yarrawonga and Tocumwal. Consistent water demand through summer, with buying that flexes with milk prices and seasonal conditions.

Stone fruit and horticulture — the Cobram district is a significant stone fruit producer. Permanent plantings at moderate water rates that cannot be fallowed in a dry year.

Mixed farming and annual cropping — irrigated pasture, fodder and annual crops throughout the reach. These growers are the flexible end of demand: they buy when allocation is cheap and scale back when it is not.

The heavy almond, citrus and table grape country — Swan Hill, Robinvale, Mildura and the Sunraysia districts — sits downstream of the Choke in Zone 7. Those permanent plantings are the reason below-Choke water carries a structural premium; see the Zone 7 guide for that demand story.

The common factor in Zone 6: demand is more flexible than below the Choke. Dairy and annual croppers can adjust water use with price, which is why Zone 6 pricing tracks Zone 1A more closely than Zone 7 does.

Pricing dynamics

Zone 6 allocation prices generally track Zone 1A but with differences:

Water Year	Zone 1A VWAP	Zone 6 VWAP
WY2022/23	$36/ML	$37/ML
WY2023/24	$68/ML	$57/ML
WY2024/25	$104/ML	$113/ML
WY2025/26	$259/ML	$267/ML

In wet years, both zones trade at similar levels. In dry years, Zone 6 can trade at a slight premium due to:

• Murray system reaching 100% allocation earlier (more certainty)
• Interstate trade connectivity (NSW Murray water can flow into Zone 6 under the 200 GL cap)

Zone 6 prices averaged $267/ML in WY2025/26 — $9/ML above Zone 1A. Note the comparison that matters for Murray buyers: because allocation trade from Zone 6 down through the Choke is effectively closed, Zone 6 does not capture the below-Choke scarcity premium — in most seasons Zone 7 trades above both Zone 6 and Zone 1A.

Interstate trade

Zone 6 is directly connected to the interstate market in a way Zone 1A is not. NSW Murray water (General Security) can be tagged and traded into Victorian Zone 6 under the Murray-Darling Basin Agreement, subject to the 200 GL annual net cap.

When the NSW-to-VIC cap is open, this adds supply to Zone 6 and can moderate prices. When the cap nears exhaustion, Zone 6 becomes more isolated and prices can spike relative to NSW Murray — spreads of $100/ML have been observed.

Interstate transfers take longer than within-state trades — typically 5-15 business days depending on both state registries and the MDBA's coordination process. Exchange rates may apply to account for transmission losses.

Carryover

Same Victorian rules as Zone 1A: carry over up to 100% of your water share volume. Automatic, no application needed. Carried water sits in your spillable account until the storage manager declares a Low Risk of Spill (LROS) — typically early in the season in dry years.

One difference: Zone 6 carryover is deemed held in Murray storages (Hume/Dartmouth), not Eildon. Historically, the Murray system has slightly lower spill frequency than the Goulburn system because of the larger combined Hume+Dartmouth buffer. In practice, Zone 6 carryover faces somewhat lower spill risk than Zone 1A carryover in years when Eildon is near capacity.

In the current environment (Hume at 22%, Dartmouth at 65%), spill risk for Zone 6 carryover is negligible. Carry with confidence.

How to trade

Register with the Victorian Water Register. Hold a water share or arrange to trade through an existing account. Our Zone 6 trading guide covers the rules in detail.

Contact a broker with your volume requirements. We source allocation from the Zone 6 market or, where appropriate, arrange interstate transfers from NSW Murray. Zone 6 can receive trade from Zone 7 (upstream trade through the Choke boundary is open, though trade downstream into Zone 7 is effectively closed), from Zone 1A via the Goulburn-to-Murray IVT when open, and interstate.

Settlement for within-zone allocation trades: 1-3 business days. Interstate: 5-15 business days. Entitlement transfers: 4-8 weeks.

Check our water pricing guide for live Zone 6 pricing.

Indicative only. Not financial advice. Water trade involves risk of principal loss.

Frequently asked questions

What is the Barmah Choke and how does it affect Zone 6?

The Choke is a narrow section of the Murray between roughly Yarrawonga and Barmah, with delivery capacity of about 7,000 ML per day and declining. Zone 6 sits above it, meaning local water delivery is unaffected by the bottleneck. The Choke is also a trade boundary: allocation trade from Zone 6 down into Zone 7 is restricted — effectively closed — while trade upstream from Zone 7 into Zone 6 is open.

How are Zone 6 allocations announced?

NVRM announces Murray HRWS allocations fortnightly during the irrigation season, starting 1 July. In WY2025/26, Murray hit 100% by November 17. Updates are published on the Victorian Water Register website.

Can I trade between Zone 6 and Zone 1A?

Generally not into Zone 6. Goulburn-to-Murray trade enters the Murray at Echuca, below the Barmah Choke, so Zone 1A water lands in Zone 7 and cannot move upstream past the Choke into Zone 6. Zone 6 buyers rely on Murray storages and above-Choke trade instead. Selling Zone 6 water down to Zone 1A buyers is likewise not a standard path — Zone 6's outlet is the restricted 6-to-7 route. Zone 6 water can trade interstate to NSW Murray (above-Choke Zone 10) under the 200 GL cap.

Why does Zone 6 sometimes trade at a premium to Zone 1A?

Zone 6 benefits from a larger storage buffer (Hume+Dartmouth = 6,900 GL vs Eildon = 3,334 GL), earlier allocation announcements, and interstate trade connectivity. These factors can create a premium in dry years.

What is the outlook for Zone 6 in WY2026/27?

Hume is at 22% (663 GL) and Dartmouth at 65% — both well below last year. If El Nino confirms and winter inflows remain below average, Zone 6 prices could run $250-400/ML. Dartmouth provides some buffer, but not enough to offset a genuinely dry season.