Imagery: Esri, Vantor, Earthstar Geographics

›

Nepean River

River

189 km

Main stem

79%

Tree cover on banks

Access places

Plan a first fly-fishing trip to the Nepean River on Sydney's western edge, a summer bass water fished at dusk with big dries, with carp and catfish through the day and closed water at Penrith Weir to keep clear of.

The Nepean is Sydney’s bass river. It runs along the western edge of the city, and in the warm months you can fish it for Australian bass after work, with a big dry fly in the last hour of light, without leaving the suburbs.

The river has three parts, and a dam and the Grose junction cut them apart. The headwaters rise about a hundred kilometres south of Sydney and flow north through catchment country into Nepean Dam; none of the listed access sites is above the dam, so do not plan a trip around it. Below the dam the river runs the length of the city’s western fringe past Camden, Wallacia and Penrith, picking up the Warragamba River, Glenbrook Creek and finally the Grose, and this is the water you fish. Below the Grose junction it changes its name to the Hawkesbury.

The easiest trip is a summer evening for bass. Use one of the listed access sites, walk to the nearest run of snags or rock, and fish a large dry or a popper from dusk into the dark. Bass have statewide NSW rules for size, bag and any seasonal closure in rivers, so read the current rules before you go. We would put a bass back in any case.

The second trip is the same water through the day, after heavy rain. The local fishing pages rate the water after heavy rain alongside dusk, and a weighted streamer or a large nymph fished along the edges is a good bet to find the bass where a dry would not. Carp, eel-tailed catfish and the odd silver perch live here too, so expect a mixed bag. Never wade or launch into a river in flood; fish the edges from the bank and go home if it keeps rising.

The one place to avoid is Penrith Weir. All fishing is prohibited within 115 metres upstream and 26 metres downstream of the weir face, and in the non-tidal river above Yarramundi Bridge the only net you may use is a landing net.

Check the current NSW rules for bass, then pick a warm evening and a snag you can reach.

No live gauge

No gauge readings are available for this water.

Season

Access & parking

Driving directions

Water and habitat

Above Nepean Dam the river drains catchment country south of Sydney, and the dam holds that water back. Below the dam it runs north, picking up the Warragamba River, Glenbrook Creek and the Grose before it becomes the Hawkesbury.

The fishing water is that run between the dam and the Grose. Snags, undercut banks and rock ledges are the structure that matters; in our experience bass sit tight to cover in daylight and move out over open water only when the light is low or the river is up.

The local pages say estuary species show up in the lower reaches.

The bank cover chart describes the vegetation along the corridor. Read it as a guide to where shade and overhanging trees are, because bass hold under both.

BANK COVER ALONG THE RIVER · SATELLITE-CLASSIFIED, 2023–25

Dense trees

Open woodland

Sparse trees

Native grass & tussock

Cultivated

Bare

Built

Fish and forage

Australian bass are the reason to come. The local fishing pages describe the Nepean mainly as a summer bass fishery, and a FlyLife writer calls the Nepean near Penrith a productive bass fishery within reach of Sydney. In our experience bass eat most things that fall in or swim past: cicadas and beetles from the trees, shrimp and small fish.

European carp are recorded in the river, and eel-tailed catfish are recorded in the river. Silver perch turn up occasionally. Longfin and shortfin eels are recorded too, and they will take a streamer fished slow along the bottom whether you want them or not. Macquarie perch also live here; check the current NSW protected-species list before you fish, and put any you hook straight back in the water.

Brown trout are recorded, and trout are said to appear after floods, but they are a curiosity on this river rather than a target. Sea mullet and pinkeye mullet are recorded as well, and the local pages put the estuary species in the lower reaches.

The forage is dominated by small fish. Australian smelt, freshwater herring, mountain galaxias and half a dozen gudgeon species are all recorded, plus eastern gambusia. That points a fly box in one direction: a sparse baitfish pattern two to three inches long, a Woolly Bugger in black or olive, and a large, dark nymph. Add surface flies for the evenings, a cicada or beetle imitation in the size 6 to 8 range, or a small popper.

When to fish it

Treat the months here as a guide’s read. The local pages call the Nepean a summer bass fishery, and that matches how we have found bass in coastal rivers: most active from late spring into early autumn, when the water is warm and the trees are full of insects.

Within that window, the time of day matters more than the month. Bass feed hardest at dawn and dusk, and the last hour of light into full dark is when the surface fishing happens. Through the middle of the day they hold tight to snags and shade, and you go down to them with a streamer or a nymph.

Rain is the other trigger. The local pages rate the water after heavy rain alongside dusk and dawn as the best time to be there, and in our experience the bass feed on whatever the rise washes in. Judge it by eye on the day: a rising river with the edges fishable from the bank is an opportunity, and a flooding river is a hazard. The river’s gauge sits in the headwaters above Nepean Dam, so it cannot tell you what the fishing water below the dam is doing.

In our experience winter is quiet for bass. The carp and catfish still feed on the warmer days, and a slow nymph in the sun on a calm afternoon will find them, but the river’s reputation rests on its summer evenings.

THE YEAR ON THIS WATER

Bass on the surface at dusk

Fly · Nov–Mar

The warm months are when the river fishes as a bass water. Fish a large dry or a popper in the last hour of light and the first hour of dark, and again after heavy rain has coloured the river. Check the current NSW rules for bass before you go.

Streamers and nymphs through the day

Fly · Oct–Apr

Between the low-light windows, a weighted Woolly Bugger or a large nymph worked along snags and rock covers bass, catfish and carp.

Small baitfish and gudgeons

Food · Jan–Dec

Smelt, herring, galaxias and a crowd of gudgeon species are recorded in the river. A sparse baitfish pattern in the two to three inch range is the plain choice.

How to fish it

For the evening surface fishing, arrive with time to look. Walk the bank in daylight, mark the snags, overhanging trees and rock ledges within casting range, and work out where you can stand once it is dark. Then fish a floating line, a short leader of a metre and a half to two metres of strong tippet, and a large dry, cicada or popper. Cast tight to cover, let the fly sit until the rings die, then give it a twitch or a short pop. A bass will hit it hard; strip-strike, keep the rod low and turn the fish away from the snag before it gets back in.

Through the day, switch to an intermediate or sink-tip line and a weighted Woolly Bugger or a similar streamer. Fish it along the face of snags and rock, count it down, and retrieve in short strips with pauses. The streamer page covers the retrieves. Catfish and carp take the same fly on the bottom, and an eel will too.

For carp, look for fish mooching along the shallow edges of the slow pools on a warm, calm day. A plain nymph landed a metre in front of a feeding fish, with a slow draw as it approaches, is the whole method. Watch the fish, not the line.

A six-weight covers everything here. Step up to a seven if you are throwing big poppers in the wind, and fish tippet no lighter than about 12 pounds around heavy snags. Carry a headlamp for the walk out, and check, clean and dry your gear before you fish another water.

Access and safety

The access card names angler access sites and boat ramps on the river. A listing is not permission to cross the land around it, and a bank you can see from a road is not a bank you may fish from; ask the landholder before you cross a fence.

Above Nepean Dam the river runs through catchment country, and none of the listed sites is there. Below the dam is where a first visit belongs; start from one of the listed sites. In our experience a kayak or small boat from one of the ramps opens more water than the bank does, but treat the weir as a hard stop.

Flood water is the hazard that matters. The local fishing pages warn never to enter flood water, and that holds on any river after heavy rain: never launch into it, and do not wade a coloured river you cannot see the bottom of. Fish the edges from the bank, and leave when the level keeps climbing.

At night, as on any river, the bank is the other hazard. Walk your route in daylight, mark the undercuts and the rock, and carry a light you can hold in your teeth. As on any bush river in summer, watch where you put your feet on warm banks.

2WD · Public Road · None · Difficult access

View place

Directions

Regulations

Two water-specific closed-waters notices from the NSW fishing authority apply to the Nepean. At Penrith Weir, all methods of fishing are prohibited within 115 metres upstream and 26 metres downstream of the weir face. In the non-tidal Nepean and its tributaries upstream from the Yarramundi Bridge crossing near Agnes Banks, nets are prohibited other than a landing net.

No season or bag limit specific to this river was found for bass. Australian bass are covered by statewide NSW rules for size, bag and any seasonal closure in rivers. Confirm the protected-species list before you fish. Those rules change, so before you leave open the current NSW fishing rules and regulations, confirm the fishing fee and exemptions and check the freshwater bag and size limits.