A Hidden Treasure in the Manso Basin

Tucked into the southwestern corner of Nahuel Huapi National Park, Hess Lake is a small but stunningly beautiful and highly productive body of water. Among the most prolific lakes of the Manso Basin, it offers reliable fishing opportunities throughout the season and can be fished using a wide range of techniques. Only rowing boats are permitted, preserving its serene and silent character at all times.

Landscape and Characteristics

Hess Lake’s low, reed-fringed shores give way to shallow stretches rich in aquatic vegetation. A network of narrow channels winds through the lake, connecting its different sections. These channels are particularly appealing for anglers, as trout frequently feed on the surface here.

Thanks to its abundant food supply, Hess’s trout tend to be more selective than in other waters of the park, offering both challenge and reward. The lake’s setting is truly unique: on one side, anglers enjoy spectacular views of Mount Tronador, crowned year-round with snow and glaciers; on the other, they navigate a labyrinth of channels that combine dramatic scenery with excellent dry- and nymph-fishing opportunities. On good days, it’s possible to land catches well into the double digits. Like other waters in the basin, Hess also provides the rare opportunity for a Patagonian Grand Slam—catching brook, rainbow, and brown trout all in a single day.

In midsummer, the lake comes alive with the legendary Dragonfly Hatch. This is one of the most exhilarating times to fish here, as large trout rise aggressively to strike big foamy terrestrials like Fat Alberts, Chernobyl Ants, or lifelike dragonfly imitations. Throughout the season, techniques and gear are adapted to match conditions, making each outing as productive as it is memorable.

Map of Hess Lake

Below you’ll find a map showcasing the most renowned spots of the lake. Explore freely and don’t hesitate to ask questions—we love sharing stories about this extraordinary lake.

Fishing Hess Lake

November – Season Opening
At the start of the season, both rivers and lakes run high and cold. Trout—especially rainbows—are fresh from spawning and feed aggressively. Streamers and nymphs on sinking lines are most effective, perfectly suited to the high-water conditions.

December / January – Crème de la Crème
Summer ushers in warmer weather, triggering a surge in aquatic life. By late December, the dragonfly hatch is in full swing, creating some of the most thrilling dry-fly fishing in the park. Big foam patterns provoke explosive takes, and early January continues much the same. These months also bring the best conditions for fishing camps: ideal weather paired with world-class angling.

Late January / February – Patience Pays Off
As water levels drop and temperatures rise, fishing becomes more technical. Anglers often shift to fast-sinking lines with smaller streamers, while evening caddis hatches still reward dry-fly enthusiasts. Precision and patience are essential for success during this period.

March / April – A Strong Finish
With the arrival of autumn, conditions stabilize and fishing improves again. This versatile stretch allows all methods—dries, nymphs, and streamers—to shine, closing the season on a strong and satisfying note.