Distance: 1.7 km (0.5 DOC hours) - Unmarked route, clear - Moderate terrain
Altitude: 1471m to 1628m. Gain: 273m. Loss: 362m . Gradient: 22 deg (Gentle)
Skills:

Unmarked route, clear (7/9)
Unmarked route, follows obvious geography (river, spur, trail, etc)

Primary, unmapped (2/5)
Route not on maps, but is principal access to hut or along range / catchment

Gentle (difficulty: 2/5)
Gentle slopes

Moderate (difficulty: 3/5)
Low scrub in open or bush / river rocks

Unknown (difficulty: 0/7)
Not specified

None (difficulty: 1/6)
No unbridged river crossings

Unknown (difficulty: 0/7)
Not specified

Up onto the saddle from the tarn then over Lucretia, along the rocky spine and descend the footpad to the saddle below pt 1605

Note: Described in the reverse direction to your journey

In 80-100 kph winds, we struggled across these rocky ridges from saddle to tarn - not really dangerous but not much fun. The route can avoid pt 1605 but stays to the top of the spine most of the way (although we dropped into the lee below Lucretia).