Swampy Plain River

River
67.7 km
Main stem
75%
Tree cover on banks
21
Access places
The tailwater below Khancoban Pondage, running open and green through farmland to the Murray with the Snowy Mountains in view. Large brown trout and lively rainbows, hoppers on the seams in summer, and evening hatches of caddis and Kosciuszko mayfly. Artificial fly and lure only from the Khancoban Station boundary to the Murray, and the flow is whatever the dam is releasing.
The Swampy Plain River below Khancoban is the tailwater the FlyLife writers rate among the best trout rivers in the Snowy Valleys: large brown trout, lively rainbows, open paddock banks with the mountains behind them, and evening hatches that can bring what looks like every fish in the river to the top.
The river is cut in two by Khancoban Pondage, a dam. The fishing here is what comes out below it: a regulated tailrace winding through farmland to the Murray River. The magazine writers report that the releases feed irrigation, so the flow runs high in the warmer months. At a modest release the writers describe a run-pool-glide river you can sometimes wade bank to bank; at a full release, a channel you should not be standing in. The gauge shown here does not track the release, so it cannot tell you which river you are driving to; treat the release as able to change without warning, and check the dam operator’s current release information before you go.
The easiest trip is bank fishing near the dam. The stretch just below the wall, off the Alpine Way on the north bank, is the walk-in water the magazine writers call the river’s most popular, and in summer a foam hopper along the seams and grassy edges is the fly. From the upstream boundary of Khancoban Station down to the Murray the river is artificial fly and lure only, so leave the bait at home, and the first 120 metres below the weir face are closed to all fishing, so start below that line.
The second trip is the float. The drift-boat writers put in at the pondage gates and take out sixteen kilometres down at the Bringenbrong Bridge, which is how you reach the water between, much of it private on both banks and hard to wade in a high release; the access card lists the angler access sites. Without a boat, the magazine writers use that bridge, over the Murray on the Alpine Way, to fish back upstream into the bottom of the Swampy.
The third trip is an evening. From summer into early autumn the late-afternoon caddis and Kosciuszko mayfly can be prolific, and a size 12 dun or sedge to the risers in a glide is, in our experience, the river’s best hour. Before you plan it, take any closed season dates from the current NSW guide.
Check the release, then start below the wall with a hopper on.
No live gauge
No gauge readings are available for this water.
Season
Access & parking
21
Driving directions

Water and habitat

A tailwater, and everything follows from that. Khancoban Pondage holds the river back and the dam lets it out on an irrigation schedule, so the magazine writers describe a river that varies wildly: a run-pool-glide stream you can sometimes cross on foot, or a raging channel where you need to be careful, depending on nothing but the release. The gauge and the flow charts follow a winter and spring rise, not the summer irrigation releases the writers describe, so they will not show the release you would be standing in.
Below the wall the river leaves the mountains and winds through farmland. The magazine writers contrast it with the willow- and gum-lined Tumut: the Swampy is open and green, with the Snowy Mountains in view, and its banks are paddock rather than canopy. That openness is why hoppers matter here and why a fish can see you from a long way off. In places the banks have been armoured with large rocks, and in our experience those rock walls, along with the gravel bars, are a good bet for the bigger fish in a strong release.
Read it as three kinds of water. Seams and edges, where the fast water meets the slow and the fish sit to eat what the current brings. Deep slots behind gravel banks and along the rock walls, where the current is broken and, in our read, the large browns hold. And the glides, where the evening hatches happen and the fish rise in the open. Each one needs a different rig.
BANK COVER ALONG THE RIVER · SATELLITE-CLASSIFIED, 2023–25
Dense trees
Open woodland
Sparse trees
Native grass & tussock
Cultivated

Fish and forage

Brown trout and rainbow trout. The magazine writers describe plenty of large browns and some lively rainbows, and the river’s reputation rests on the browns. Australian smelt, mountain galaxias, climbing galaxias and river blackfish have all been recorded in the river, which tells you there are small fish for a big brown to eat and a reason to swing a streamer in the deep slots.
The food that matters to the fly rod is on the surface. Hoppers are plentiful in summer along the paddock banks. Caddis and Kosciuszko mayfly hatch late in the day from summer into early autumn. Under the surface, the magazine writers’ fly lists lean on tungsten nymphs in sizes 10 to 14, which suggests the fish feed deep in a strong flow. So the box is a foam hopper in 8 to 12, a caddis dry and a mayfly dun in 10 to 14, a pair of heavy nymphs in 12 to 14, and a dark streamer for the rock walls.

When to fish it

The season is the reverse of a mountain stream, and the magazine writers say the best fly fishing is often in the warmer months when the dam is releasing hard. That is a guide’s read too: a strong summer release tends to push the fish to the edges, where you can reach them.
December to March is hopper time along the seams and the grassy banks, best on a warm, windy afternoon. Summer through early autumn brings the evening caddis and mayfly, which the writers describe as prolific at times; be on a glide by late afternoon and stay until dark.
The river is listed under the NSW trout and salmon closure notification, so take any closed season dates from the current NSW guide.
THE YEAR ON THIS WATER
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Hoppers on the seams
Fly · Dec–Mar
The river runs through paddocks and the magazine writers describe hoppers as plentiful in summer. A big foam hopper fished along the seams and the grassy edges, with a nymph hung under it when the fish will not come up.
Hoppers in the paddocks
Food · Dec–Mar
Grasshoppers blown off the farmland banks are the summer food. Warm, windy afternoons put the most on the water.
Evening caddis and Kosciuszko mayfly
Fly · Dec–Apr
Late afternoon and evening hatches in summer and early autumn that the magazine writers describe as prolific at times. A caddis dry or a mayfly dun in sizes 10 to 14, fished to the rising fish in the glides.
High irrigation releases
Flow · Nov–Mar
A regulated tailrace. The magazine writers report that the best fly fishing is often in the warmer months when the dam is releasing hard; the same releases make much of the river hard to wade. The gauge shown does not track the release; check the dam operator’s current release information before you leave.

How to fish it

Rig for the release. A six weight is right for the hoppers and the evening rises; take a five if you fish a low-release day, and something with more backbone if you will be throwing two tungsten nymphs into a full flow.
Hopper water is the seams and the edges. Fish a foam Hopper in 8 to 12 along the grass, land it with a splat, and hang a size 12 nymph under it on a long dropper when nothing comes up; in our experience a buoyant dry-dropper can draw rainbows up hard. A yellow Stimulator in 10 to 12 does both jobs when the hoppers are not thick.
Deep water is a good bet for the large browns, behind the gravel bars and along the rock-armoured banks where the flow slows. Our pick is weighted nymphs fished down deep under an indicator on a long tippet; a tungsten Pheasant Tail or a tungsten Hare’s Ear in 10 to 14, two of them, with enough weight to reach the bottom in the current. Fish the slot from the side, mend hard, and expect the take to be a stop rather than a pull.
The evening is a glide and a dun. Get below the risers, use a long leader, and match the size before the pattern: a size 12 or 14 mayfly dun or a Klinkhamer for the Kosciuszko mayfly, an Elk Hair Caddis or a sedge pattern in 10 to 14 when the caddis are on. When it looks like every fish in the river is up, pick one and fish it.
From a drift boat, fish the banks the wading angler cannot reach, and let the oars hold you off the seams. This river is a favourite with the drifting crowd for exactly that reason.

Access and safety

The access card names the angler access sites; the magazine writers describe the water just below the dam wall, off the Alpine Way on the north bank, as the most popular bank stretch, and the Bringenbrong Bridge over the Murray on the Alpine Way as the place to walk back upstream into the bottom of the Swampy. Between the two, they describe a sixteen-kilometre float from the pondage gates to the bridge with the banks in private hands, which is why the drift boat is the tool for the middle river. Do not cross a fence to reach it.
The release is the hazard. This river can change from wadeable to dangerous on the dam’s schedule, and the change is not something you will get warning of standing in the water. The gauge and the flow charts do not track the release, so they will not tell you what is coming out of the wall; check the dam operator’s current release information before you leave, look at the river at the wall before you get in, and on a strong release stay on the bank or in the boat. Wear a wading belt, carry a staff, and do not try to cross a run because the far bank looks better.
AWD · National Park · Seasonal road closures may apply · Difficult access
View place
Directions

Regulations

NSW DPIRD lists the Swampy Plain River as artificial fly and lure only water: the whole of the river, its creeks and tributaries, downstream of the southern (upstream) boundary of Khancoban Station and upstream from its junction with, but not including, the Murray River. No bait below that boundary. Check the current guide for where the Khancoban Station boundary sits before fishing the top stretch.
The NSW closed-waters notice closes that part of the river within 120 metres downstream of the weir face at Khancoban Pondage to all fishing methods.
The river is listed in Schedule 2, Table A1 of the Fisheries Management (Trout and Salmon - Fishing Closure) Notification 2023, as artificial fly and lure only water. Beyond that listing and the closed water below the weir, no closed season, bag or size limit specific to this river was found; take any closed season dates, the licence rules and the current trout bag and size limits from the current NSW Department of Primary Industries and Regional Development recreational fishing guide before you fish.

Questions

Related

New South Wales
Jurisdiction guide and current authority links, including the trout closed season dates, the recreational fishing licence and the current trout bag and size limits.
Hopper
The summer fly here. Sizes 8 to 12, foam, with legs, fished along the paddock banks.
Stimulator
A yellow one in sizes 10 to 12 floats a heavy nymph under it and passes for a hopper or a big caddis on its own.
Pheasant Tail Nymph
The tungsten-bead version, sizes 10 to 14, is the fly for the deep water behind the gravel bars and along the rock walls.
Page reviewed 2026-09-24
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