Pros & cons
PROS
- Reachable as a ~2‑hour side trip from Goat Pass
- Informal camping spots around the shoreline
CONS
- Steep tussock and scree with off‑route navigation required
- Avalanche exposure May–November in the surrounding terrain
- Multiple hazardous river crossings on the approach routes
Overview
High on a bench beneath Mt Oates, Lake Mavis is a true alpine perch—remote, wind‑scoured, and worth the grind if you like your lakes earned. Think steep tussock and scree above Goat Pass, a cairned ridge instead of a formed track, and the kind of solitude you only get once the crowds stop at the hut.
Getting There
Most parties come from the east via Greyneys Shelter on SH73: up the Mingha Valley past Dudley Knob and Mingha Bivvy to Goat Pass Hut. From the west, the longer Deception River route starts near Morrisons footbridge and also reaches Goat Pass Hut. Both valleys involve numerous river crossings that can become dangerous or impassable after rain.
The Final Push from Goat Pass
From the pass, allow roughly 2 hours and a 500 m climb. Head up the steep spur east of the pass on tussock and scree, then follow cairns along the ridge to the lake. This section is unmarked, exposed in places, and demands confident off‑track navigation—save it for clear weather.
Season, Conditions, and Hazards
Summer and autumn are the go: snow has usually receded and days run longer and warmer. Avalanche hazards are a real factor from roughly May to November (and whenever snow lingers), including around Mingha Bivvy. Rivers in both Mingha and Deception rise fast—don’t commit if levels are high or the forecast is grim.
Camping and Facilities
You’ll find flat-ish spots around the rocky lake margins for a bivvy or tent; bring a groundsheet to protect your floor. There are no facilities at the lake. Goat Pass Hut sits just north of the pass, and Greyneys Shelter at the road end has toilets. Treat water taken from the lake or streams.
Practical Notes
- DOC considers the Mingha–Deception route suitable only for well‑equipped trampers with prior backcountry experience.
- Mingha Bivvy lies in known avalanche paths—avoid in snow season.
- Vehicle break‑ins have been reported at track ends; leave nothing visible and consider alternative parking if advised by the Visitor Centre.
Best Time to Visit
Target a stable summer or early‑autumn weather window. Start early from Goat Pass to make the most of firm morning travel and to leave plenty of margin for the steep descent. Skip this side trip in heavy snow or after significant rain when rivers are up.
Where it is
-42.9021, 171.6443Tips for Lake Mavis
- 01From Goat Pass, budget about 2 hours and 500 m climb on a cairned, unmarked spur.
- 02Check river levels and forecasts; defer if the Mingha or Deception is high.
- 03Carry avalanche gear and skills if any snow remains on the route.
- 04Bring a groundsheet—camping spots around the lake are rocky and hard.
- 05Leave no valuables in cars at Greyneys Shelter or other road ends.
Amenities
Near Lake Mavis
All places →All trails →
1 mi awayGoat Pass Hut20-bunk backcountry hut on the Mingha–Deception routeLodging · Restroom
1 mi awayGoat PassIconic alpine saddle on the Coast to Coast routeScenic Viewpoint
1.9 mi awayMingha/Deception Route TrailheadGateway to the classic Goat Pass traverse via river valleysTrailhead · Parking
2.6 mi awayEdwards HutClassic 16‑bunk hut reached via river crossings and tussock flatsLodging · Restroom
4.3 mi awayOtira Valley TrackShort alpine valley to a tiny bridge with big Southern Alps viewsModerate · 2.3 mi · 1.5 hr
4.3 mi awayMt Philistine via Otira ValleyShort approach, big alpine punch: bluffs, scree, and glacier viewsChallenging · 5.5 mi · 7 hr
4.4 mi awayTemple Basin TrackShort, steep climb to big alpine views and a quirky ski basin shelterModerate · 3.1 mi · 2.8 hr
4.5 mi awayBealey Valley TrackQuick forest stroll to Bealey Chasm and Mt Rolleston viewsEasy · 1.5 mi · 48 min
